Check Engine Light? O2 Sensor Heater Circuit Malfunction - Code P0141

[@1AAuto]

√ *Watch the Video* √ *Buy The Part at 1A Auto* 1aau.to/m/Visit-1AAuto √ *Do it Yourself* √ *Save Money*

[@BenRay727]

The whiteboard paired with clear explanations made for a great video 🤙🏼 Currently working on a different chassis and I still feel confident enough to diagnose. Thank you.

[@vernonjackson6387]

Excellent Video!! The drawing and your detailed explanation of what could happen in any given situation with the wiring/sensor were superb !

[@anval1257]

Great way to explain what it could look complicated in a simple way ...Excellent Video !!

[@sabrinawilliams3746]

I have looked at many many videos on my fault code P0037 and this one by far has given me the most in depth information on what may be the problem. Thank U!!!!!

[@anthonymoore8153]

This guy is a good teacher

[@davidcoleman4865]

Awesome video, broken down so it's super easy to follow along and understand. I like the way this guy explains stuff. Thank you sir.

[@tombarrow2341]

Don’t often comment, but this was a great instructional video

[@andyl5645]

It was helpful. Thank you. You were very clear, specific, and stuck right to the issue without going off topic. Great job!

[@1AAuto]

+Andy L Thanks for checking us out. Shop for high quality auto parts on 1AAuto.com: 1aau.to/m/Shop-1AAuto-c

[@SteveInQLD007]

brilliant explanation for us dummies that know WHAT the code is but not sure HOW to test what's going on! Well done

[@angelogarcia7941]

Super helpful thank you! I need help. Instead of replacing the O2 sensor, I preformed the test like you showed in the video. I found that I do have power to the senor but no pulsating light (4:56) when checking the PCM circuit. No light at all. So, I'm assuming something is broken, as explained in the video at around 5:56. How to I find this broken connection?

[@jameszelaznysr5179]

We need more people in the world like you great presentation short and to-the-point

[@samuelanderson1415]

Informative video thanks 👍🏼👍🏼👍🏼

[@1AAuto]

Anytime Samuel! We are glad you enjoyed it.

[@BryanG830]

This code popped up and I was a little confused when it said O2 sensor heater. But this video clearly explains what O2 sensors do, what where they're located and what the cause might be. I love coming to this KZbin channel.

[@michaelfulton6662]

All of that talking where is it located dude

[@rickymeadows5176]

Most Informative video I have ever seen on KZbin for pin-out voltage check of 02 sensors, thank you so much for this info !

[@rjmlondon]

Hi great video. The test light pulsing i assume is ecm doing pwm to heat up sensor?

[@leatherdevil21]

Thanks for this video! It was a big help!

[@1AAuto]

Glad to assist Chuck!

[@reikhard]

best video about this subject i've seen! Thanks!

[@joeydelmarsjr.646]

i need your help, I have the same o2 connector as in your video, 4 wire, 2x whites for elements and black/gray for signal. I been getting 0141 and 0138 which points to the downstream o2, and i replaced it and still getting hi volts b1s2. i checked the voltage on the truck side, as in your video, and im getting 13v for the elements and 4v for the signal. my upstream sensor is working fine and no other CEL codes have returned its always 0138 and/or 0141

[@meisterlampe17]

Hi! What is the expected current flowing through an O2 sensors heater? i measure 0.5A only, which would be some benign 7 Watts of heating power. I measured 4 Ohms on the sensor which should give me more than 3 amps. Or is it pulsed and thus less? Plus side of circuit is fine, the cable to the PMU i still have to test. If the PMU is the problem, what do do?

[@SkyPlayz_YT]

I have code po140 chevy tahoe. I tested everything, replaced wiring, and still have the code. Now what?

[@U4Eye]

You tested and trouble shooter this issue like a Real Pro as my mechanic even learned so much! Excellent skills

[@pathavens9836]

So I don't get the pulsing light when checking the PCM feed. The wires are the plug look good. Everything is shielded going back up so how do I check it back toward the PCM?

[@NACHALCHAIM]

This man has at least one mistake. If the ground to the PCM was broken, nothing would work right.

[@1AAuto]

+NACHAL CHAIM Thanks for the tip! We'll pass this info along to our production team.

[@johnever3226]

good video ,, thanks for the info ,,, i have a 2009 mountaineer v8 and my check engine light just came on , when reading the code it show al 4 oxygen sensors are faulty ,, can this be right ?? ,, fuses are good ,, any adviced ? .. thank you .

[@thegamehud8214]

If both downstream o2 sensors are removed because of a newly installed turbo kit without cats , would these check engine light codes cause my 18 f150 v8 to go into limp mode at 50% throttle or higher? That's the issue I'm running into

[@michaeldecker8853]

Are you suppose to supply 12v directly to the pcm bypassing the load in the circuit? Could have just backprobed and should have had 12v on both heater wires Key on if the circuit was good,

[@cmcbarnett]

So replacing it does what? 🤷‍♂️ Is it going to run better? Is it necessary? Sorry. Probably a dumb question.

[@saiapupua72]

Awesome video no one has explained and showed this as good as you. Great teacher

[@danbeckley3140]

I have a 2006 Ford ranger 4.0 and the downstream O2 sensor is coming on I didn't check the ground wire yet but it doesn't have any catalytic converters on it I bought it with no exhaust pipes and I made my own y pipe it has the upstream O2 sensors on it and I made a spot for the downstream O2 sensor how can I get the downstream O2 sensor to go off and stop sending the code

[@gedionsamuel2256]

If the Oxygen sensor is fairly new, changed all sensors a few months back, what could possibly be the reason for this downstream sensor failure?

[@gregorygarcia873]

I have a 2003 Dodge Durango with 5.9l engine I told it for a smog test pass everything it didn't pass because hearter of the o2 sensor didn't pass but had engine codes at all can you please tell me why my car did pass smog I took another smog place it pass in one hour

[@NomadicDmitry]

Awesome, very interesting! Thank you for an explanation. I have Chevy Express van and it throws the O2 sensor codes.

[@marcomendoza9068]

What if my ground circuit does not blink/pulse and tester is just steady on? Thanks

[@stevenellen4294]

I have p0036 on my mk3 ford focus bank 1 sensor2 I have fitted new sensor and have reset engine light and about a week later it come up with engine light any Ideas

[@flightmedic7169]

Do you have any videos on diagnosing electrical problems on headlights? My ballasts keep going off

[@CarlosRodriguez-ud3zb]

At f-150 2004 5.4 3v what number is the Sensor Heater fuse?? HELP!!!

[@joesezzz4324]

03 Tacoma both cats and 02 replaced new plugs air filter all fuses goid is there a relay or something else to get the p0036 code off?

[@joshfig96]

My p0141 and p0161 both come on at the same time, 6 key cycles.. can it be my ECU? 2003 Jeep Grand Cherokee.. need my emissions asap

[@tweezyyoutube]

What if you got codes bank 1 sensor 1 and bank 2 sensor 1 p2195 and p2197 for 2007 ford se with one exhaust pipe

[@buffystclair9042]

If you dont have access to wiring diagram or forget the colours you can switch sensors side to side and see if code moves same as you would do moving coils to check misfire .

[@DaVictorRecords]

Hello can an 02 sensor cause a car not to start? What happens if i mistakenly in stall an upstream sensor in the downstream position? I changed my 02 sensor on a mazda..my car stalled and now its not starting.

[@randallmason9687]

My 2.4l has two wire O2s . Shows a heater circuit code? Checking the fuse next.

[@elpelondelpelillo1970]

I have the problem with my Ford ranger, I need a recommended mechanic in this area please 91402 zip code

[@trini_boi2414]

You're the man I love how you did it on paper good job 👍

[@dangerousmecanicsautomotiv8130]

I want to see “FIXD” do that. Heeeell no.

[@alangardner3717]

your drawing helped me understand how the oxygen sensor worked found blown fuse cleared code on cheap obd reader magic thanks for your help.

[@tjcregertc]

good video thanks! got no ground signal 2003 honda pilot..fudge ..idk where to go next..

[@rogerflores5175]

What if when I test ohms to pcm which light pulsates but in my case it don’t pulsate it just stays on ! Lit the whole time what does that mean ???

[@terriessex2083]

That was so informative the greatest instructional video I've seen yet really with vehicles I would love it if all mechanics would explain it so simply and so cut-and-dry thank you so much from one female to an auto mechanic

[@lard1892]

Does your plumber, electrician, doctor,realtor, lawyer, explain everything to you so you can do it yourself???? For some reason a mechanic is supposed to help out everybody for free

[@semaj3630]

Does anybody know the fuse for a 2005 Acura TSX I can’t find it

[@Maxson631]

I think on the second testing on the tip of the oxygen sensor is not enough to say circuit is good because we need to test the wire from the tip of the O2 sensor to the pcm port, I’m I wrong?

[@MajdiHabet]

I'm testing my pmc circuit and the test light doesn't pulse it is just a solid light

[@scottgarvy]

Not only subscribe and like, how about buying some parts from them?

[@tonycotta6602]

You did'nt give the resistance reading for that 02 sensor that always helps

[@medhelmihlioui]

My post catalytic o2 sensor heater command is reading 9% on cold start (obd scan) is this normal ?

[@martinherrera4907]

Definitely one of the best videos,, well explained, detailed… It really helps to understand which the possible issues are and how to check them… 👍🏼👍🏼

[@uoncyberteam5699]

Isn't it much easier to check the resistance between the heater circuit connector pins before examining other components?

[@trumpismypresident8996]

Where does a heated o2 sensor go up or down stream I have 3 o2 sensor and only 1 heated but it doesn't tell me where it goes

[@Blackmambaaa69]

How can I find the o2 sensor fuse on a 2010 Ford F-150 user manual?

[@desiresalaazar9698]

Please I need confirmation is bank 1 the left catalytic converter or the right ?

[@ranshuk5166]

! Very Good !

[@jerikoekurtz7641]

could a break in the signal wires cause this p0141 code?

[@heroknaderi]

I appreciate it

[@turamash7808]

This was simple and well explained. Thanks very much!

[@PlisiKokajve]

All Yours videos means a lot of things! Thank You!

[@FleetTech97]

Great explanation and diagnosis! More of these diagnosing videos please!

[@Drew23law69]

What happens if it pops a fuse every time with brand new O2 sensors? Where would you recommend checking?

[@1AAuto]

+@Drew23law69 We wouldn't be able to diagnose an issue like that here, you may want to have a local mechanic take a look at it. Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@r.j.m.5327]

So I did all of your wiring test but when I went to test the 2nd part of your video neg/ pcm as I connect the jumper wire to the tester the light immediately lights up with out turning the vehicle on. And light never pulse like in your video. Any suggestions?

[@1AAuto]

+@r.j.m.5327 We wouldn't be able to diagnose an issue like that here, you may want to have a local mechanic take a look at it. Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@kaaraa-mardha1977]

The sensor has 4 wires, how do you selected the pink to test voltage instead of others

[@qrs3658]

very good video. very concise and to the point. its like, no need to go to automotive school when we got these very informing videos

[@dailygrindism]

test light is cool but would love actual readings. ie volts, ohms, etc

[@nathancornwell1455]

I have an 03 odyssey but i can't figure out what fuses are for the 02 sensor...they arent labeled as such. Where would i find that info?

[@mohammedmusa1522]

My range rover 2007 is hard start

[@VictorWolassAnsah]

E46 can't start or cranking want will be the problem please

[@makantahi3731]

i done like you and bulb blinks but i installed 3 new sensors and all heat up too slow

[@divineautostechsolutions791]

How do I test the wiring for my o2 sensor of my 2008 honda pilot

[@dattstoneddad3089]

Can not having cats throw a code for heater circuit Malfunction?

[@mckoylach1622]

Thanks for your testing procedures,great video

[@audiofrik]

I think this is the best video I have seen on this topic. Thanks.

[@nicgliacco6766]

Very well done video, excellent explanation and showing of diagnosing procedure. Thank you!

[@nawfdallasstepper6973]

Could this be the reason my 99 Acura is running hot ?

[@digitalmixer]

What is a p1035 chevy silverado?

[@daydailey9439]

I put in a new o2 sensor but the code still shows

[@daviderhahon]

Circuit problems then. Follow Andy's guide.

[@viliamitalakai2787]

What does it mean if the negative test doesn't pulse?

[@muhammedazam8938]

Excellent job man.... Keep it up... You have been a real help understanding the working of O2 sensor 👍👍👍

[@muhammedazam8938]

I have heater circuit code for all the 4 sensors for Ford explorer 09 could there any other reason apart from the possible reason you stated in the video just and what could they be would be a great help to check and diagnose them

[@VictorWolassAnsah]

I have e46 1.8i can't start or cranking nothing

[@goham7201]

Very nicely explained. I had this code and replaced with a new sensor and got the p0420 code now instead of the original code. Any help would be appreciated.

[@805BeachRecoveries]

Your cat is bad. Sensor is reading the same before and after the cat

[@wahdawi1842]

Where is the black (-) wire in 4:49 connected to ?

[@james102377]

How do you diagnose a p0133? I have a Jeep compass. Can't find fuse locations if it even has them. Pretty sure it wouldn't be and exhaust leak because b1s1 is right on top of the manifold. I've replaced the sensor every year now for 3 years. This time it was 2 days and code came back

[@michael-xe7rz]

Best Display YET!!!!

[@Marc99GT]

Great video! I have a 2011 Impala LS and I can't clear the P0036 and P0141 codes. I replaced the sensor, I have power on the supply side heater and the computer grounds as well. I ohmed out all 4 wires to the ECM and found continuity and no resistance. I believe either the heater is bad in the new sensor(Denso) or the ECM is faulty.

[@billygraham5589]

HELP!!! WHERE on a 2001 Toyota Echo are the o2 sensor fuses? I had replaced my o2 sensors 2 years ago, and my check engine light went out and rushed to the smog place and passed, and like 1 hour after passing smog, my check engine lights came back on. It gives me a P0135 and a P0141 codes AND now I get a "low coolant temperature" code, p0125. I can tell you that I replaced all these sensors a few days ago. That did NOT solve the problem. The "Blue Driver" OBDII device shows that the o2 sensors are providing a signal. I replaced the sensors with genuine toyota/denso parts. What could be the problem here?! I would think a bad catalytic converter, but that would give a different trouble code....

[@4486xxdawson]

I have bank 1 sensor 1 and bank 1 sencor 2 code , just put a new egr tube on it , then cleared codes then light came on and i needed a cam position sencor did that now got p141 on both driver side , im not shur if i should just swap them both out or do all this testing , any help would be greatly apreciated my truck 1999 yukon denali ,,,, im starting to feel like johnny cash ,,, i built it on bolt at a time .........lol

[@kimjackson1052]

I bought my car with a remote start SUPPOSEDLY, but it's never worked.. could it still possibly be affecting this system??

[@al-mubdizahir8704]

i have a 2000 ford crown victoria police interceptor. someone cut off my rear cats and plus one of the o2 wires is cut. i have that code and check engine light is on. car is not running right at all . my county does not do emissions. i just want my car running right.dont wanna buy two cats. expensive. whats my options

[@kicknsystm]

Good vid. but no help to me. Brand new sensors & I confirmed with a multimeter they're good. I don't have fuses for these circuits so can't check those. No aftermarket security system but I do have the original factory system that still works. I'm lost.

[@CR3D1T_UN10N]

absolutely amazing video! great explanation and demonstration on how to properly diagnose it!!! Helped me figure out that my PCM was bad after the i got a o2 sensor heater malfunction

[@karlhungus545]

Excellent video. I have a '99 GMC Sierra 2500 that has an intermittent engine light, P0141. I already changed the sensor once myself and it just came back on. It's off at the moment, but if/when it comes on again, now I know how to test it. Funny that twice when I had it in to the mechanic(s) for other things, they couldn't seem to figure it out🙄 Useless...

[@agustindelahidalga881]

Super helpful to understand how these work! Much appreciated. Time to hunt down my issue