O2 Sensor Replacement Fixed Rough Idle & Limp Mode of E90 M3 [ENG SUB]

[@funcarsgoodpeople]

[Errata] The “thread glue” I mentioned is actually an anti-seize lubricant. [勘誤] 我提及的「螺絲膠」應為防卡死螺絲膏／潤滑膏。 Please look into the fault codes carefully to identify the root cause! This was the bad O2 sensor BEFORE CATALYZER. 請仔細從故障碼判斷問題的根源！這次是「觸媒前」含氧感知器的毛病。 ***Parts Required*** Oxygen sensorBEFORE CATALYZER X2 BMW 11 78 7 537 984 Bosch LS 17038 / 0 258 017 038 ***Tools Required*** 8 mm hex socket (trims) 10 mm hex socket (trims) 17 mm hex socket (reinforcement strut/plate bolts) torque wrench with angle (56 Nm) 22 mm open hex spanner (O2 sensor) 22 mm open hex torque spanner (25-50Nm) ***Tightening torque spec*** O2 sensor before catalyzer 50 Nm (OE exhaust) after cat 25 Nm (OE exhaust) Bolts on reinforcement strut/plat 56 Nm + 90° (replace blots) ***所需零件*** 「觸媒前」含氧感知器 X2 BMW 11 78 7 537 984 博世 LS 17038 / 0 258 017 038 ***所需工具*** 8 mm 六角形套筒 (飾板) 10 mm 六角形套筒 (飾板) 17 mm 六角形套筒 (加強車架) 附角度扭力扳手 (56牛頓米) 22 mm 開口六角扳手 (含氧感知器) 22 mm 開口六角扭力扳手 (25-50N牛頓米 ***鎖緊扭力*** 觸媒前含氧感知器 50牛頓米（原廠排氣管） 觸媒後 25 Nm（原廠排氣管） 加強支架上的螺絲 56牛頓米 + 90°（需更新螺絲）

[@littleroller]

Best detailed replacement of S65 O2 sensors on KZbin!

[@funcarsgoodpeople]

Thank you littleroller for the comments. My pleasure to help 🥹

[@asimabbasi6257]

Very nicely explained! Thanks for making this thorough and structured. Hoping to get mine remediated and this was some solid assurance im on the right lines. Keep making great videos! AJ from London, UK

[@funcarsgoodpeople]

Thank you AJ! My pleasure to help. Let us know if this works for you. Best wishes!

[@mirzoni5331]

I have this issue with driveoff with diesem engine. Does diesel engine have same sensors?

[@funcarsgoodpeople]

Hi Mirzoni, the diesel BMWs have O2 sensors too, just different part numbers. It is recommended to scan the codes with diagnostic tool to get more clues before ordering and replacing the parts. Best!

[@mirzoni5331]

@@funcarsgoodpeople i will do check before ordering parts. Also i have rough idle no matter cold or hot engine but my rpm are good just idle is not good to hear. First time i was thinking maybe its egr valve but im sure its 02 sensor

[@funcarsgoodpeople]

I see. I think it is easier to fix O2 sensor because there will be fault codes so we can make sure about the root cause. Come back and let us know if you succeeded!

[@mirzoni5331]

@@funcarsgoodpeople Sure i will. Can you tell me can i conact you in a private? Ig or facebook?

[@funcarsgoodpeople]

Please add fcgp2019@Instagram or e-mail [e-mail] 😀

[@brian.z6592]

难得看到有华人BIMMER发英文DIY视频，太赞了！

[@funcarsgoodpeople]

Hi Brian 謝謝你！希望一點小小的心得可以幫助到一樣喜歡DIY的朋友 🤗

[@CJBrown3000]

I have a BMW E60 528i with an O2 Sensor code of 2CA6 (O2 Sensor heater circuit error Bank1 Sensor1). Car runs and drives just fine but the check engine light is on. No limp home mode. I have a 50/50 shot that it's either the O2 sensor needs replacing of the car's wiring harness for the O2 sensor is shot.

[@funcarsgoodpeople]

Hi CJ it's good you are aware of this fault so when something happens you can take action right away... and the right way 😁 I guess the O2 sensor can still work without the heater circuit because exhaust temperature is high enough to keep sensor at it's working temperature. But it's likely to give wrong data when the car is cold. I searched 2CA6 in ISTA for E60 528i and quote this; Condition for fault memory entry: O2 sensor temperature < 680 °C for more than 5 sec. Action in service: 1. Visual inspection of wires, DME plug and O2 sensor for damage 2. Check wires (including resistance) 3. Check plug-in connections DME Wiring harness Upstream (pre-cat) O2 sensor on Bank 1 (water or corrosion in the plug? => Repeatedly disconnect the plug and then FIRMLY press it back in) 4. Replace O2 sensor 5. Replace DME I hope it's just a minor wiring harness problem for you. Come back and let let know how it's fixed. Best.

[@cya3651]

Hello, do you know where is the fuse for the 02 sensor located for the e92 M3? There is a video on youtube about the E92 02 sensor fuse location, but it is only for non-M. Thank you in advance...

[@funcarsgoodpeople]

Hi Cy! I’ve checked the posts regarding the O2 sensor fuse on some forums. I’ve also checked the wiring diagrams of E9x Ms/non-Ms in ISTA. Here’s my summary; An O2 sensor does not have an exclusive fuse. All the wires on an O2 sensor are connected to the engine control module (DME). The heating power of an O2 sensor is provided by the DME. So the actual fuse you mentioned is one of the fuses for the DME. I guess people are pulling the fuse to reset the DME to clear the fault codes related to the O2 sensors. There are two fuses via which power goes to the DME; one for power loads (30A) and one for the electronics (10A.) For the E9x M3’s DME (MSS60) the fuses are F4 (10A) and F39 (30A). There is also another DME main relay (K6300) integrated in the fusebox A4010. NOTE: fusebox varies with production year! You are welcome to mail me via: [e-mail] and let me know your VIN. I’ll send you the related documents and wiring diagrams.

[@djan9el]

Excellent video! By the way, please consider making a tutorial video on how to install ISTA, recommended computer hardware, what cable to use, basic diagnostics, etc... Thanks for your DIYs. Keep it up.

[@funcarsgoodpeople]

Hi Angel thank you very much! I agree that it will be the topic many DIYers want to know. But honestly I have no idea how the copyright is gonna work 😅 I will think about it and do my best to make a useful video about ISTA. See you soon!

[@funcarsgoodpeople]

Hi Angel I am thinking of making a video about ISTA installation. What is your operating system? Just curious 🤔

[@QuanNguyen-vi1fi]

I am chasing the same symtoms as your. My car is E70 pre-lci. The only sensor code I got is 2C31. Can your verify the 02 is my root of issues? Thank you

[@funcarsgoodpeople]

Hi Quan I have the same fault (but different code) at the beginning. Yours corresponds to DME: Oxygen sensor before catalytic converter, trim control or DME: Oxygen sensor emissions control. So yes that's it! Please suspect a bad O2 sensor. Please note that there's some variants of the engine so some X5 have single O2 sensor and some have two. Let us know if it works for you!

[@QuanNguyen-vi1fi]

@@funcarsgoodpeople absolutely, I have been chasing this ghost for a while. Overlooked the sensor and replaced vanos solenoids, Camshaft sensors, Disa and eccentric shaft sensor but still. Thanks

[@funcarsgoodpeople]

I understand how disappointing it was! After all we will fix it for sure. Best luck!

[@funcarsgoodpeople]

You are right Makaveli! There are millions situations that can occur so sb else’s help from the Internet is really limited. So Quan plz gather as much clues as possible for us to sort it out. Best.

[@user_skjd82ji]

No need for [English Sub]. You speak English perfectly. Better than most Americans :) Taiwan looks like a beautiful country. If I didn't know any better, I would have thought you were in California because it looks similar.

[@funcarsgoodpeople]

Thank you David! I tried so many times lol and there were a lot of NG takes. And yes Taiwan is beautiful. I have been wishing to include those beautiful views in my videos... maybe I should do some topics about driving in TW...

[@danefoster5452]

Awesome video. I'd like to check the shaded fuse for all of my sensors. I saw a video on here showing me that there was a bank of 5 fuses inside a black case I side the engine fuse box but on mine no such bank exists which suggests it's in the glove fuse box but I have no diagram and no idea where to locate it it :(

[@funcarsgoodpeople]

Hi Dane thank you for the feedback! Which car model are you talking about? The S65 engine does not have independent fuse for the O2 sensors so I did not have to check them during the troubleshooting. If you are looking for fuse map or wiring diagram for a BMW, you can mail me [e-mail] and I will look it up for you 🤗

[@danieldekeyser6477]

I’m having problem with oxygen sensor bank 2 with code 275E what sensor would that be? Pre cat or post cat?

[@funcarsgoodpeople]

Hi Daniel, this code does not mention about the location of the o2 sensor. I searched a little bit and found that code 275E is stored when the air/fuel mixture is too lean/rich. This is when the adaptation has reached its limit and cannot adjust anymore. The code does not say that O2 sensor is broken but it may be possible. I think the pre cat sensor is responsible for this code (where post cat is for monitoring cat conditions) so you can try to replace it if necessary. Please come back and let me know how it goes 🤗

[@danieldekeyser6477]

@@funcarsgoodpeople what would I buy then, pre cat sensor?

[@funcarsgoodpeople]

@@danieldekeyser6477 Hi Daniel, I suggest swapping the bank 2 O2 sensor with bank 1 first to see if the code goes to the bank 1 side. The sensors are not cheap so better have the faulty one confirmed!

[@alexsib7671]

Hi pls help witn O2 sensors! My codes 2729 and 274B. They appear all the time. After installing a new O2 sensors, they appear again after 10,000 km. Exhaust system tuning

[@funcarsgoodpeople]

Hi AlexSib, you are talking about the codes for E9x M3 right? I checked on bmwfault.codes and the codes imply broken harness or short circuit of the O2 sensor before cat on bank 2. Please see below; 2729: DME: Oxygen sensor, coast-mode diagnosis before cat., bank 2. Check plug and wiring harness to pre-cat oxygen sensor LSVK B2 (focus on opens in wires for virtual ground and pumping current). 274B: Oxygen sensor pump current calibration fault before cat. converter, bank 2. Check plug and wiring harness on pre-cat oxygen sensor LSVK B2 (especially trim circuit wire IA). Since you have replaced the O2 sensor, there is possibility that the harness or wiring got broken, as indicated by the fault codes. Please come back and let us know your progress!

[@alexsib7671]

@@funcarsgoodpeople yes

[@alexsib7671]

@@funcarsgoodpeople I checked the wiring, everything is fine. maybe this is due to the installed ESS firmware

[@funcarsgoodpeople]

Thank you AlexSib, I'm not sure if the aftermarket firmware sets a different standard for triggering the error codes. This has to be verified by ESS. I am thinking of installing a supercharger to the S65 and that requires a new firmware too. I will respond to this comment if I find anything related to the error codes. See you!

[@kojokonu5947]

Thanks, the beginning of the video is hilarious, loved the way you said we'll get you fixed baby. When will you upload the transmission and differential fluid change video? really really want that. and one more thing, do you have any tips on trouble shooting DSC malfunctions on this car. I currently have this -Start-off assitance inactive -DSC malfunction! Drive carefully

[@funcarsgoodpeople]

Hi Kojo Thanks for the comments! I’m happy you like this video 🤗 I had the same warning message twice due to: 1. poor connection of SZL plug: access the switch column and use electric contact cleaner to clean the plugs before re-plugging it. 2. throttle actuators failure: the malfunction can be the actuators or line connections. Need to see the code. AND DSC codes can be cleared only if DME has no codes. So make sure the problems and codes on DME are all cleared. The M3s have high and uniform quality so they all have same issues 🤣 don’t worry pal, there must be a fix for us. Best wishes!

[@funcarsgoodpeople]

And the next video will be the MT and LSD fluid change. Stay tuned!

[@kojokonu5947]

@@funcarsgoodpeople Thanks thanks, I just realized you have the MT, I have the DCT, also 4 door e90 m3. I guess its the LSD fluid change i'll benefit the most from. Thanks for everything, one big happy m3 family

[@gabby811ify]

After replacing bank 2 sensor 2 with BOSCH the new codes that arrived is 27C7 Adaptation Trim Control Bank2 and 273B Oxygen sensor Check After Cat Bank 2 came up and tips?

[@funcarsgoodpeople]

Hello Kevin sorry for the late reply... really busy with my work but I got your message for sure. Have you reset the adaptation for the O2 sensors? This is a must. I think 27C7 is the hint to reset the adaptation because the DME needs to learn about the new values with the new sensors! After adaptation, both codes should go away. Let me know the result!

[@gabby811ify]

@@funcarsgoodpeople I believe I did an adaptation of clearing the codes is what you mean? But just recently I did a hard reset by disconnecting the battery to. Does that work as well?

[@gabby811ify]

@@funcarsgoodpeople thanks for the help and by responding as well 🙏🏻

[@funcarsgoodpeople]

Hello Kevin nope I meant resetting with a diagnostic tool like I did in 14:47. I believe you are doing the hard reset right but I’m not sure if that works for the M3. I heard that some OBD2 scanner can also do the job. Please see if your friends have this?

[@gabby811ify]

@@funcarsgoodpeople I have the LAUNCH creeder elite obd2 scanner but there’s not much tutorials on adaptations.

[@dev3527]

I have 2B4E codes and 2B42 to 2B49 misfires impairing exhaust emissions on all 8 cylinders, i changed the O2 sensors but without doing the reset of adaptations, i ll do it soon, and a rough idle at cold start only, i had this issue after changing my full exhaust system (x pipe + front pipe with sport cats) is it related ? But I don’t have an engine malfunction reduce power and a limp mode like this M3..

[@funcarsgoodpeople]

Hi Dev thank you for chiming in. I don’t think the rough idle is related to the X pipe and sport cats. What I often heard about rough idles are related to the fuel tank breather (rough idle after filling a full tank) and the idle control valve. I had the misfiring codes on all 8 cylinders when I still had the stock cold start function. Usually the codes came when the car was having the asthma (for warming up the cats to reach emission standards quickly.) There was nothing else than the codes and a check engine light. After this function was tuned out, I NEVER had all-8-cyl-misfiring codes anymore. The E9x M3s all have similar problems so don’t worry it is likely something already happened to someone. Plz check if your car has the stock DME tune, a bad fuel tank breather valve or bad idle control valve. Best wishes!

[@dev3527]

@@funcarsgoodpeople I changed the idle control valve & the fuel tank breather.. the issue is still here, i changed the O2 but i didn’t make a reset of adaptations, i ll do it soon, i have the same cold start like you every time i start the car with stock DME, when the engine is warm i have no issues, no reduce power or engine malfunction.

[@funcarsgoodpeople]

I see. Probably resetting the adaptations of O2 sensors and idle value can help. Let us know if this work for you! Best.

[@funcarsgoodpeople]

Hi Dev how are you? Have you solved the problem? I made a video about misfire fault codes and cold start delete kzbin.info/www/bejne/Y3nGfox4mNGdlbM Please let me know what you think!

[@dev3527]

@@funcarsgoodpeople hey fine and you ? Yes i’m in the same case, same fault codes also, your car has no more misfires codes and rough idle at cold after deleting cold start ??

[@FunnyBunnySunnyy]

Great video man appreciate all the help hopefully you can keep providing us with more diy’s !!!

[@funcarsgoodpeople]

Thank you funnybunnysunny! My pleasure to share what I know! Sorry for not uploading videos for a while but three videos are being processed. See you soon!

[@cathybrown-fi7oh]

Hi sir, my car bmw 3 series 318 d n47 engine 75000 miles, when driving slow moving traffic when you accelrate it goes limp mode few seconds then suddenly it accelerate fast.it drives normal. If we brake quite often and then accelerate same problem, i did had smoke smell in the cabin one time. is it oxgen sensor problem

[@funcarsgoodpeople]

Hello Cathy, I don't think it is the O2 sensor problem. Can you read the fault code? The limp mode I mentioned in the video comes with a check engine light. It is a protection mode of the engine. Once entered limp mode, it cannot be exited in a short time. So I don't think your car is in the limp mode. I am guessing the throttle body problem because the throttle response seems very rough. But I am just guessing. Please get a diagnostic tool to read the fault codes. Then we can nail the problem more accurately!

[@cathybrown-fi7oh]

@@funcarsgoodpeople Thank you, you are kind person. I don't have the scanner, I will buy one from eBay or Amazon. Do you recommend any scanner. I am taking my wife car to drive and school run.today I was driving just one mile to testing, there was no loss of power, braking and driving. tonight I am taking risk, driving to work place it around 8 miles. I will report to you. I did see video to put wd40 on turbo actuator and I wiggle it. I cleaned air filter around mass sensor.

[@cathybrown-fi7oh]

@@funcarsgoodpeopleI like to repeat, three months back while driving, whenever driving slow moving traffic, when suddenly when you accelerate, it goes loss of power engine light comes, automatically after few seconds the car itself moves little bit fast(like sudden spike) without putting pedal on accelerator, I have to put my leg on brake because of spike. Then it drives normal. When we stop at traffic light and accelerate loss of power engine light flashes and goes or when we restart engine light goes off. But it happens only occasionally. There is no loss of power when there is no traffic. Last week it stopped middle of the road on signal, I have restart and took the car. I am just afraid take car with family.

[@funcarsgoodpeople]

Hi Cathy you are welcome. This reply is about OBD2 scanner. BMWs will show its faults in terms of P codes (fault codes beginning with letter P) which is common among most automobiles. So any scanners can read the fault codes. However, BMW has its own code system (4-6 digit number mixed with English letter, as shown in my video) to give very detailed description about certain symptom. i.e. L6 and V8 engines may show same P code about O2 sensor problem, but you have to decode BMW fault code to see which bank of the exhaust is having the problem. I used an OBD2 scanner once but it did not give me enough information, especially for those BMW-specific modules. No corresponding P codes were read out. I use INPA or ISTA, the PC diagnostic software to translate BMW fault codes. But if you feel too inconvenient messing with diagnostic tools, you can go to nearest shop and ask them to read out the fault codes for you. Please take photos of every code you get. I can look it up for you in ISTA. Or if you can get the BMW codes, we can look it up together on bmwfault.codes/

[@funcarsgoodpeople]

Hi Cathy I got your descriptions. I searched roughly and found that flashing check engine corresponds to misfire. And the failure of high pressure fuel pump (HPFP), which is common problem for N54, can cause the misfire (cylinder not getting enough fuel.) But this is just a rough guess. The check engine light will leave a lot of fault codes for us to troubleshoot. They will tell you which cylinder out of the six is having trouble, or some other malfunctions the car detected. So I suggest doing a diagnosis with OBD2 scanner as the first step!

[@AutomotiveTherapy]

did you see any white smoke during cold starts?

[@funcarsgoodpeople]

Hi Automotive Therapy, sometimes during cold weather yes but I think it’s water vapor and the amount is normal. Do you mean combustion problem?

[@AutomotiveTherapy]

@@funcarsgoodpeople My e90 M3 blows white smoke out when I start the car and idles roughly. Could that be due to a bad 02 sensor?

[@funcarsgoodpeople]

Yes there is this possibility. I suggest using a diagnostic tool to check the fault codes. A bad O2 sensor is likely to throw codes so you can nail it down easily. There are many other possible conditions that lead to white smoke and rough idle. Please don't do try-and-error like I did before 😅😅😅

[@yuantianwen]

thank for your show the whole repair process

[@funcarsgoodpeople]

Hi tianwen thank you too! My pleasure 🤗

[@maxelito1000]

Hello, thank you for your video. I hope you can help me. I have problems with my M3 year 2008. Misfire 8 cylinders, bank 1 and 2. This only happens cold start for 25 seconds, then everything works correctly. Detected code DME 2b4e. Thank you, I hope you help me.

[@funcarsgoodpeople]

Hello Marcelo, Don’t worry, I had the same codes and symptoms before. They are due to the cold start function of the S65 engine. After I had the DME(engine control unit) tune to remove the cold start function, the engine starts with normal idle and I never see these codes again. The S65 engine has some useless features for the emission control, such as secondary air recycling and the cold start function we are talking about. These features have nothing to to with performance so some people completely remove them from the car. Who cares? The cold start function is designed to warm up the catalyzer quickly by injecting a lot of fuel so you will observe crazy asthma of the engine in the first one minute of start. Sometimes it chokes the engine so the owner gets freaked out but there is no problem in the engine at all, despite a check engine light is left on the instrument panel (and tons of codes about misfiring on 8 cylinders including 2B4E). For my observation, the cold start function will work if the car is parked for more than two days. If you drive everyday, it is less likely to take place. But anyway it is very strange and annoying, I agree. The disadvantage is that the check engine light can make one overlook other real malfunctions of the car. So I went to some tuner to disable this cold start function by writing the DME. (Search: cold start delete.) After the cold start function is disabled, the engine starts and goes into stable idle at around 800 rpm right away, no crazy fluctuation of the engine speed, as you see in 20:19 . Please look for a reliable tuner to have your DME tuned. This can completely solve the issue. Anyway I believe there’s no problem with your M3, you can also leave it as an original feature. Just be prepared to look into those codes periodically to bust real faults!

[@maxelito1000]

@@funcarsgoodpeople Hello, thank you for your time and answer my questions. It will eliminate the cold start and solve the problem. I have had the M3 for 6 years and I have always had the problem present. Again, I appreciate your time, thank you for your help. Greetings

[@funcarsgoodpeople]

You are very welcome! Marcello! Please let me know if you have done the cold start delete and if you are satisfied with the result 🤗 Best wishes!

[@funcarsgoodpeople]

Hi Marcelo how are you? Is the problem solved? I made a video about the cold start delete, kzbin.info/www/bejne/Y3nGfox4mNGdlbM Please let me know what you think!

[@maxelito1000]

@@funcarsgoodpeople Hello, god thx, how are you? I have not been able to eliminate the cold start. I saw your video of how to proceed to eliminate cold start, I am very grateful for your dedication of the video, now I will proceed. Thank you for the video, I'll let you know how everything is going. Greetings

[@bimmersgaragepurwokerto2059]

I have problem at my 320i e90, fault code is 2ABC : oxygen sensor before cat converter mixed up, I replace oxygen sensor but dont normal, but i don't adaptation on ista, maybe any info for solve my problem, thanks

[@funcarsgoodpeople]

Hello Purwokerto, please check the two wiring harness (or the plug connector) of the two O2 sensors. Make sure they are not mixed up or swapped. Adaptation reset is also needed because the DME does not know new sensors are replaced. Maybe you can use the disconnected battery method to reset the whole car. Otherwise a diagnostic tool/software is needed to do the reset.

[@gabby811ify]

Bank 2 sensor 2 is driver side after cat?

[@funcarsgoodpeople]

Hi Kevin, yes that's correct! (Bank 2 is on the left side, despite LHD or RHD. ) Do you have anything wrong regarding the sensor 2? I have the code but don't see any problem so far (scratching head 🤔

[@gabby811ify]

@@funcarsgoodpeople yes, I have 3 codes for sensor 2 bank 2. I think I just need to replace it.

[@funcarsgoodpeople]

@@gabby811ify I see Kevin, sensor 2 is just for monitoring the condition of the catalytic converter. I don't think it is going to affect the performance so don't worry too much! However it's a good idea to get rid of those fault codes. Welcome to the Faultbusters!😎

[@gabby811ify]

@@funcarsgoodpeople thanks appreciate the help!

[@gabby811ify]

I replaced bank 2 sensor 2 and the codes p2098 and P014A comes out. Wondering if I just maybe didn’t tighten it all the way?

[@marc8321]

Thanks for your nice explaining! Info with ISTA solved my problem!

[@funcarsgoodpeople]

Hello Marc thank you for the comment too! I am happy this video helps. Wish you a healthy bimmer!

[@SakkChasing-ps3hj]

Hello I have a 2008 750li and my car went into limp mode when I put the obd2 I got codes of throttle body/pedal position sensor and also catalyst system efficiency below threshold(bank2) I swapped out the TB and the gas pedal and still nothing I even swapped out MAF sensor and I’m still in limp mode do you think my problem is just my O2 sensors ?

[@funcarsgoodpeople]

Hi Sakk thank you for the message! Could you please show your fault codes? Let me check more in detail. For my case, there will be fault codes about O2 sensor if it is really broken. The " catalyst system efficiency below threshold(bank2) " code doesn't tell about a broken sensor. We need to keep monitor about this one.

[@idrisu1]

Can ISTA help me diagnosis parasitic battery voltage drain?

[@funcarsgoodpeople]

Hi idrisu1 thank you for the question. I quickly looked up in ISTA and it has the service function "Evaluate Close-circuit current monitoring" which uses the intelligent battery sensor to do the measurement. I show you the function description (in ISTA) as follows: Description In the event of problems with increased closed-circuit current, it is frequently the case that this must be determined during Service. With the conventional procedure, a shunt resistor must be fitted at the earth strap of the vehicle. Evaluating the closed-circuit current monitoring: On vehicles with an IBS (Intelligent Battery Sensor), the DME/DDE monitors the closed-circuit current when in the idle state. The IBS is only fitted with certain equipment options (e.g. M-ASK or CCC). The test module for evaluating of the closed-circuit current monitoring first of all tests whether an IBS is fitted at all. In this model series, the results of the last 32 cycles of closed-circuit current monitoring are stored in the DME/DDE. A new cycle of closed-circuit current monitoring is stored under the following conditions: Terminal R is off for at least 70 minutes. The vehicle is in the idle state for at least another 120 minutes without being wakened. If these conditions are met, the result of the closed-circuit current monitoring is stored in a new cycle. The oldest cycle of the 32 cycles is overwritten by the new cycle. If the vehicle is wakened after saving a cycle, a new cycle can then begin if the conditions are met. The result of a cycle of closed-circuit current monitoring has two categories: In the first category, whether or not an auxiliary consumer unit was logged in during the idle state (at least 120 minutes) is stored. An auxiliary consumer unit is a consumer unit that can also be activated in the idle state of the vehicle. In the case of closed-circuit current monitoring, a distinction can be made with regard to logged in auxiliary consumer units: - No auxiliary consumer unit was logged in - A statutory auxiliary consumer unit was logged in (e.g. light or hazard warning lights) - The independent heating was logged in - Another auxiliary consumer unit was logged in In the second category, the range of the closed-circuit current during the idle state (at least 120 minutes) is stored. In the case of closed-circuit current monitoring, a distinction can be made with regard to closed-circuit current: - 0-80 mA (normal closed-circuit current in the idle state without auxiliary consumer units) - 80-200 mA - 200-1000 mA - Over 1000 mA Increased closed-circuit current in a cycle can be seen above all when no auxiliary consumer unit was logged in, but the closed-circuit current was above 80 mA. Bear in mind that in the event of problems with the idle state of the vehicle no new cycles for closed-circuit current monitoring are stored. If the vehicle does not 'go to sleep', e.g. due to a 'sleep preventer', no new cycle of closed-circuit current monitoring is stored. Saving a new cycle of closed-circuit current monitoring is also prevented if the vehicle is permanently wakened by a control unit or a user.

[@AntonioGonzalez-lt5yv]

Just seeing this video but i have an e92 with the n54 and my car is misefiring in cylinder 2 and is running code p0040 with the misefire code p0302. Could the o2 sensor failing create misfires ?

[@funcarsgoodpeople]

Hi Antonio, the P0040 code implies that the o2 sensor connectors of bank 1 or 2 may be mistakenly swapped. The six cylinders are divided into two banks and I believe their o2 sensors are very close and identical. Please check the connectors to see if they are correctly installed. You can also clear the codes, swap the connectors and see if P0040 comes back. Sometimes cleaning the connector contacts will also help. I don’t think P0302 is related to P0040. There may be a bad spark plug or ignition coil on cyl. 2. Usually we swap the plug or coil ONE AT A TIME to see if misfiring goes to the other cyl. If so we can nail down that faulty part. Please come back and let us know how it works for you. Best luck!

[@dimitrijejankovic5721]

i had a problem with bank 2 after kat, after replacement error was gone by now i have 002CA2 CDKHSVSA - heating lambda probe before kat (shear stress) and 002CA3 CDKHSVSA2 - heating lambda probe before kat (shear stress) bank 2, any idea what is a problem now?

[@funcarsgoodpeople]

Hello Dimitrije, from the error codes it looks like another sensors have failed 🤔 they are the ones before the kat. The o2 sensor has to be heated to their working temperature and the code indicates the heating coil has failed. Usually the coil cannot be repaired so replacement is necessary. But before spending a lot of money for new sensors, please check if the connectors are loose, or the power supply for heating is out. Let me know what you found!

[@dimitrijejankovic5721]

​ Hi @funcarsgoodpeople, after replacement of o2 sensor before kat and drive of 120km it was all okey. But after next start after some time i got another error 002C45 - DME: Oxygen sensor before catalytic converter. I just sow that you did adaptation rest, i didn't do that, because i'm using Carly. Maybe error is because of that or something else, any ideas? Thanks for help

[@funcarsgoodpeople]

Hello Dimitrije, Please try to reset the adaptation. Actually I forgot to do it after O2 sensor replacement. The DME(ECU) still memorized the erroneous air-to-fuel mixture value so I got same rough idle and misfire upon the very next start. After adaptation reset, the replacement was successful, as shown in the video. I had Carly before and I don’t like it because it kept asking me to pay for its limited functionality. I don’t think it’s useful for your professional DIY. Maybe you can visit local repair shop and ask them to do the reset with their diagnostic tool. I guess this is the quickest way to do the adaptation reset. Best wishes!

[@funcarsgoodpeople]

002C45 relates to the o2 sensor you replaced. Please check harness connection too!

[@dimitrijejankovic5721]

@@funcarsgoodpeople i just both OBD cable for INPA, do you have some how to guide who to reset the adaptation?

[@莊小智-p3t]

老闆 請問一下 我的也是大概四五天亮一次引擎燈 顯示排放升高 和你上述的故障伴隨著Edm故障也－樣 但 我轉速沒有被限制5500 r p m 這也o2 故障嗎？

[@funcarsgoodpeople]

嗨！莊小智您好。如果您沒有關於O2的故障碼的話，那車子就是正常的。請參考我另外一部關於冷車啟動程序的影片 kzbin.info/www/bejne/Y3nGfox4mNGdlbM 我的車子原廠就有跟您一樣的症狀，關閉冷啟動後就完全解決了，不曾再亮燈（直到O2壞掉，才有鎖轉速的情形）。

[@莊小智-p3t]

我也不是冷起動時亮引擎燈 沒有明確含氧故障碼 但有顯示e d m故障

[@funcarsgoodpeople]

您是說DME的故障嗎？可否提供故障碼，一起研究一下 🤗

[@莊小智-p3t]

老闆 你方便留個聯絡方式嗎？

[@funcarsgoodpeople]

別客氣，我沒有開店不是老闆 😅 叫我卡爾就好。可以email寄[e-mail] 或者IG fcgp2019 🤗

[@gabby811ify]

What was the purpose of Adaptation Reset

[@funcarsgoodpeople]

Hi Kevin, the engine control unit (the DME for BMW E90) does not know that O2 sensor has been replaced. So the DME memorizes the faulty values read by old sensors. Adaptation reset is like calibrating the exhaust monitoring system 🤗

[@gabby811ify]

@@funcarsgoodpeople thank you for always responding. Yea we followed your steps and starting to feel like we have bad ignition coils. They are SMP and not OEM.

[@funcarsgoodpeople]

I see! What are the codes you are getting? Indeed the limp mode symptoms can be very confusing so I always suggest people start with the faulty codes 🤔

[@gabby811ify]

@@funcarsgoodpeople since I replaced all sparks with NGK but with SPM coils, they all are misfire codes

[@funcarsgoodpeople]

I see. I have another video regarding codes about misfire cylinder 1-8: kzbin.info/www/bejne/Y3nGfox4mNGdlbMsi=gSkrcUmjBHHUOwEe but that’s due to the natural design of the S65 engine 🤷‍♂️ Consider cold start delete if the misfire codes become too annoying ☹️

[@bruskii_3364]

Hello I just replaced the main fuse to all 4 oxygen sensors after getting 2c9c, 2c9d, 2c9e, 2c9f. I also replaced both upstream oxygen sensors and the codes went away except 2c9e and now I’m getting code 3100 as well and it’s pretty much doing the same thing as yours rough idle and limp mode. I still have yet to replace the downstream oxygen sensors tho but could this be the reason why I’m getting the 3100 code as well as the 2c9e? Also mines an 09 335 e90

[@funcarsgoodpeople]

Hello Bruskii thank you for the comments. I believe you have done the right work. But did you #reset the #adaptation after the replacement? The DME has to reset the biased values it learnt from previous #O2sensors. I guess that code 3100 is due to incorrect adaptations in the DME. If the DME sees something wrong about the emission, it may put the car into some strange mode. 2C9E is due to the sensor after the #catalyticconvertor and it shows #heating is not working. If the fuses are normal, then it's likely the sensor after cat is bad. You may have to replace the whole sensor. This can be confirmed by swapping it with the other sensor after the cat to see if the code becomes 2C9F.

[@bruskii_3364]

@@funcarsgoodpeople I have tried clearing codes but I did go back under the car and checked the wiring again and found out the previous owner had spliced one of the 02 sensors I guess trying to bypass it for some odd reason so I’m guessing that’s why I’m getting the 2c9e but I will try getting the dme looked at sometime soon thanks for help tho much appreciated‼️‼️💯💯

[@funcarsgoodpeople]

Oh I’ve never heard people doing this. I think you are very close to solving the problem. Come back and let us know how it works!

[@bruskii_3364]

@@funcarsgoodpeople definitely will thanks again‼️‼️

[@SuperBeastin247]

Is the use of inpa really necessary?

[@funcarsgoodpeople]

Hi Saul do you mean using ISTA? ISTA and INPA are used to reset the adaptations here. I know somebody does so by disconnecting the battery for a period but I haven’t tried this method on the M3. After the O2 sensor replacement, I didn’t reset adaptation upon the first start and it was not successful. So the reset is a must and I recommend using ISTA because I think it is the easiest way for this job 🤗

[@summitcarstensz]

I have same problem, but after scan there is O2 sensor readiness after cat conventer bank 1 : Not ready.

[@funcarsgoodpeople]

Hi Summit good morning! As far as I understand, O2 sensor after cat converter is responsible for monitoring the condition of the cat converter. I don’t think I is related to the combustion of the engine. However we faultbusters do not let go any faults 😁 The O2 sensor is usually pre-heated to work properly. It is very common that heating coil inside it has broken, leading to the readiness code. Besides, O2 sensors are not designed to be repaired so buying a new one may be necessary. As I said the O2 sensor after cat converter is not essential for the combustion so I don’t think it has the priority to be replaced. There may be other causes of your problems. Could you also describe the symptoms ?

[@DaVictorRecords]

Good day Sir. I changed my 02 sensor and now my car stalls and wont start. Is it possible? I have a mazda demio 2005

[@funcarsgoodpeople]

Hello Kenrick good morning. Please reset the air-fuel mixture after replacing the O2 sensor. Too rich or too lean will make the engine stall and that's reasonable. In fact my first start after the replacement was no success because I forgot to reset. It was the second start that you see in the video 😆

[@DaVictorRecords]

@@funcarsgoodpeople how do you reset?

[@funcarsgoodpeople]

Hi I used BMW's service application to do the reset. I googled how to reset Mazdas and I found a lot of people disconnect the battery to reset the car. The strategy is to make all electricity dissipate so the PCM (power control unit, or ECU, engine control unit) forgets the adaptation. Step 1 Open your Mazda's hood. Step 2 Disconnect the "Negative" terminal clamp to your Mazda's battery. The negative clamp should be black and marked with a "--" symbol. The positive terminal should be red and marked with a "+" symbol. Step 3 Sit in the driver's seat of your Mazda. Step 4 Push down and release the brake pedal five times consecutively. (or turn headlights on and off, press horn to discharge the electricity.) Wait 10-15 minutes to reconnect and ECU should be reset. Step 5 Reconnect the "Negative" terminal clam on your Mazda's battery.

[@DaVictorRecords]

@@funcarsgoodpeople ok thank you will try

[@DaVictorRecords]

@@funcarsgoodpeople 1 more question. What would happen if i mistakenly install an upstream 02 sensor in the downstream location?

[@wiliway9435]

nice videos sir .sir i have m3 e90 i have 2b07 teouble code pedal travel sensor...what can i do sir? can i reset/adaption like you do? i m from indonesia sir

[@funcarsgoodpeople]

Hi Wili thank you for leaving a comment! Yes there is an reset function for the accelerator pedal. Maybe your diagnostic tool has this function so just try it. I think it won't hurt. Here's the information I found in ISTA about the Accelerator Pedal; === The accelerator pedal module detects the driver's instructions for altering the speed of the vehicle. Design and function The position of the accelerator is detected by a special sensor and analysed by the digital engine module (DME). The accelerator module is fitted with two independent Hall-effect sensors. Those sensors each transmit a voltage signal corresponding to the current pedal position. For safety reasons, two sensors are used. On that basis and taking other engine operating parameters into account, the required position for the throttle valve is calculated. The throttle valve is then operated by the throttle valve positioner. The accelerator module receives a constant voltage of 5 V from the DME. For safety reasons, each sensor has a separate power supply. The two Hall-effect sensors transmit a signal that is proportional to the pedal position. The signal from sensor 2 is always exactly half the voltage of the signal from sensor 1. The two signal voltages are permanently monitored by the DME. Diagnosis The maximum engine output is limited in the event of a fault. The vehicle has a delayed response to abrupt movements of the accelerator pedal. If two faults occur simultaneously, the engine speed is limited to max. 1500 rpm. The relevant fault codes are stored on the DME identifying the faulty Hall-effect sensor. The following faults can be detected: - Hall-effect sensor short circuit - Signal above Hall-effect sensor voltage range - Signal below Hall-effect sensor voltage range - Implausible difference between signal levels of the two Hall-effect sensors - Power supply failure or voltage too low === I suggest trying to clean the connector pins of the pedal module. The poor connectivity of electrical contacts often leads to such kind of fault codes. If that doesn't help, probably the pedal module needs to be replaced.

[@harryflemming9924]

Love the dude in the back corner hitting the pipe...

[@funcarsgoodpeople]

lol Harry that's my wife lighting up mosquito incense 😂😂😂 and she was pretty worried about me working under the car so she was keeping an eye on me 🤗 thanks for the comments 🥰

[@manvsmachine1]

I’m curious what your car’s mileage was?

[@funcarsgoodpeople]

Hello the fault code about O2 sensor before catalyzer came around 115k km. And only the one on bank 2 was faulty. I replaced them on both banks.

[@damon123jones]

great diagnosis guy

[@funcarsgoodpeople]

Thanks Damon. This taught me a lesson about reading the fault codes carefully 🤗 A diagnostic tool is really needed for modern cars 🤔

[@masonlowdermilk7705]

Thank you for this video! Very helpful and very informative DIY 👍

[@funcarsgoodpeople]

+Mason Lowdermilk Thank you too! I am happy you like it. Let us know if this works for your car!

[@jdmslaterTv]

Dude why don't you have 200k subscribers... I have this problem with my 02 sensor bank 2 sensor 1

[@funcarsgoodpeople]

Hi Jdm Slater thank you 🤗 I’m just starting out. I’m happy enough the video gets to someone whoever needs it. It’s a good news you got the fault code and know it’s sensor 1, before the catalyzer. You are very close to solving this problem. Please let us know how it works for you 🙏🙏🙏

[@Everybodyshinetogether1]

When it’s cold mine revs up to 2000 rpm for while tell it goes down and starts having a rough idel does that happen when o2 sensors go bad n52

[@TheSkabz]

Awesome content bud

[@funcarsgoodpeople]

🤗 Thank you! I’m glad my broken bimmer helps somebody🤣

[@止符休]

我有疑問想請教….不知道版主還會看到回覆嗎xd

[@funcarsgoodpeople]

嗨👋止符休您好，有看到留言唷！歡迎您的提問唷 🤗

[@止符休]

@@funcarsgoodpeople 我有冷啟動的問題… 有時候第一發會missfire, 然後冷啟動怠速就是忽高忽低… 然而穩定後整天幾乎都不什麼問題… 看了許多文章..清一色都是說更換 fuel tank breath… 但似乎沒有什麼作用…. By the way.. 油箱加滿後會不好發車需要吃一點油門…. 不知版主有什麼看法可以給個方向…謝謝

[@funcarsgoodpeople]

@@止符休 Hi 您好，冷啟動的問題我也曾經有過，與您描述的狀況一樣，建議寫電腦關閉這個功能，請見我另一部影片 kzbin.info/www/bejne/b5-WZJebZpyKn6s 關閉冷啟動（ #coldstartdelete ）之後，完全不會有misfire還有怠速忽高忽低了。這部分與fuel tank breather是無關的。 而油箱呼吸閥（ #fueltankbreather ）故障後，油箱的油氣會從怠速控制閥（ #idlecontrolvalve ）進入燃燒室。當加滿油，油氣比較濃的時候，就會影響燃燒，聽說第一發都會熄火。發車吃一點油門是讓更多空氣進入，稀釋油氣，才會比較順。所以您的呼吸閥可能也有故障。 如果呼吸閥已經更換，還有怠速的問題的話，就需要檢查怠速控制閥了。

[@止符休]

@@funcarsgoodpeople 有人建議我寫掉cold start.. 可是發車的氣勢就沒了.. 蠻可惜的… 會感覺變得跟一般3係一樣…這樣感覺除了寫掉程式好像也是無解了… 剛換完呼吸閥..等下次油加滿才會知道問題有沒有解決了…lol

[@funcarsgoodpeople]

@@止符休 您說得沒錯！我也很喜歡 #M3冷啟動 的那個氣勢。缺點就是會出現故障碼以及亮引擎燈 :( 轉速上上下下的時候，甚至還會自己熄火 wtf... 如果您可以忍受上面的症狀的話，確實是不用 #關閉冷啟動 的。剩下的就是 #油箱呼吸閥 的問題，有任何進展歡迎回來討論唷！祝順利！ 卡爾

[@osbaldoesquivel3645]

Excellent video!

[@funcarsgoodpeople]

Thank you Osbaldo! I hope this video helps 🙏

[@carmelomedina5840]

Excelente video. Tengo la misma fallas en mi subaru 03 y jamas chequeamos el sensor de oxígeno. Gracias gracias

[@funcarsgoodpeople]

Hi Carmelo thank you for the comments! I hope this will work for you. Please come back and let us know if you have succeeded. Good luck! Hola Carmelo gracias por los comentarios! Espero que esto funcione para tí. Vuelve y cuéntanos si lo has logrado. ¡Buena suerte!

[@呂宸緯-x4u]

好市多看過實車、絕美的牌！遛E90V8👍🏻

[@funcarsgoodpeople]

哪裡 🤗 感謝有帥哥選了5190，才輪到我遛E90 ❤️

[@呂宸緯-x4u]

六碼牌V8，很難不多看一眼🤣

[@呂宸緯-x4u]

@@funcarsgoodpeople 5190V8車主賣掉有點可惜😂。

[@funcarsgoodpeople]

@@呂宸緯-x4u 還好這張好牌還在那部美車身上（就我所知啦）希望車主也能繼續愛她！

[@riyaniqbal8956]

I had misfire on all 8 cylinders, changed the exhaust gasket and now the misfire is only on bank 1 cylinder 1-4. it is not the coils or spark plugs. I am thinking o2 sensor maybe now but I have not got an error code for it so I am slightly confused. please let me know if you can share some wisdom!

[@funcarsgoodpeople]

Hello Riyan! I think the DME is smart about the condition of an O2 sensor. If the sensor is bad, we get a fault code about it. The first thing I am guessing is the O2 sensor adaptation. Please do a reset to see if the misfire go away. Actually I did not reset the adaptation after replacing the O2 sensors. The first start was still limp mode. I did the reset like in the video, it became normal. So maybe your DME still memorizes the wrong fuel/air mixture? I am just guessing. The second thing is to let your car complete a drive cycle. When the car reaches working temperature, and some time of driving, it starts testing the exhaust system for emission control. From the text below it suggests to keep engine running for at least 18 min. I will say try to cruise on highway at fixed speed for 10-20 min. [Dynamic check of oxygen sensors before catalytic converter] This system test determines by means of lean/rich shifts in the air/fuel mixture the deviation integral for the oxygen sensors before the catalytic converter from the target Lambda value. The diagnosis result is a diagnosis value from 0 to 1 per bank. The higher the diagnosis value, the better the state of a sensor. Setpoint value: Diagnosis value greater than 0.4 If the value is less than 0.4, the vehicle must be driven: - Engine at operating temperature - 2 min at approx. 2500 rpm - - Speed greater than 60 km/h - lower part-load range - run at least one coasting phase of approx. 3 seconds Before driving, the engine has to run without interruption for 18 minutes so that the diagnosis can run. The engine must not be switched off before the journey is completed, as otherwise the 18 -minute count starts from the beginning. If no oxygen sensor fault is stored in the DME after the road test, the oxygen sensors are OK. If a fault is stored, the sensor concerned must be renewed.

[@ptlpszt1]

Excellent tutorial. Thank you.

[@funcarsgoodpeople]

Thank you! I hope this helps. Let us know if it works for you! BTW, nice alias, One man and a jack 🤗

[@ptlpszt1]

@@funcarsgoodpeople thank you brother. I have an e93 with these same issues. Whats hilarious is I thought I was wathing myself on yt. 😄

[@funcarsgoodpeople]

😭 Welcome to the support group. You can be the faultbuster too 😎👊👊

[@ptlpszt1]

@@funcarsgoodpeople Yup. That was the problem. DME was always complaining about bank one and rough idle. Its allgood now. Thanks again!👊

[@EL.ipappiiq]

Your the best 👌

[@funcarsgoodpeople]

Thank you for the comments! I will do my best 😉

[@importpro1334]

Good video thanks for the help!

[@funcarsgoodpeople]

Thank you Import Pro! I’m happy you like it. Wish everyone a healthy car!

[@aleksejkovalkov835]

Thanks 👍

[@funcarsgoodpeople]

Thank you too, Aleksej🤗

[@chadfortman4162]

You fix it by never buying one 😂

[@funcarsgoodpeople]

Hi Chad yes that’s a precautionary measure 😂 I didn’t know that a lot of people have this issue until I published this video. I’m pretty surprised.

[@chadfortman4162]

@@funcarsgoodpeople BMW you know what it stands for. Buy More Warranty

[@funcarsgoodpeople]

Haha thank you Chad for the joke. I did not know that! 🤣

[@damon123jones]

you're a funny guy 😁

[@funcarsgoodpeople]

Thank you DJ! I’m just trying to be creative with the videos. Very glad to have you entertained 🤗

[@Joseph19239]

You can call this one of the best…. Given your part numbers what actually to do, other people videos it just tell you, you can find it in the website…

[@funcarsgoodpeople]

Thank you Joseph. I like to write a textbook LOL

[@grosom31]

thread glue = anti seize!

[@funcarsgoodpeople]

Thank you Grosom31! I just learned! So that is a kind of lubricant rather than glue. I will include this in the errata 🤗

[@grosom31]

@@funcarsgoodpeople not a problem it was just a heads up its used because of the heat cold cycle of the exaust it can be difficult to remove o2 sensors otherwise.

[@funcarsgoodpeople]

Grosom31 thank you again for the add-up 👍👍👍

[@damon123jones]

i need to get you an mpact gun

[@funcarsgoodpeople]

lol thanks Damon. I enjoy hand tools but powered tools are really handy honestly. I thought about getting one but since I don’t use them everyday, I decide to save money for car parts 😁

[@idrisu1]

I have the same code on my e92 m3, 2b37 and 2b44. Replaced 02 sensors and reset adaptations no lick. Tried swapping plugs and coils as well without any change. Any advice?

[@funcarsgoodpeople]

Hi idrisu, so your problem is cylinder 3. Plug and coil seem not to be the problem. You can try swapping the fuel injectors which is not difficult (but expect minor fuel spillage). If not the injector, I would do a compression test to see what’s wrong with cylinder 3 ☹️

[@richcortez2251]

Great Video Bro 😎

[@funcarsgoodpeople]

Thank you Rich! Another video about rough idle and misfiring codes is coming soon. Stay tuned!