BMW P0171 P0174 2883 2882 Bank 1/2 Lean Code diagnostics and vacuum leak fix

Welcome back everyone! Today we tackle the annoying problem of lean codes on our e46 2003 330CI convertible. This was caused by a vacuum leak on the intake boot that fits on the throttle body. I show you leak testing with the smoke machine and we discuss how these codes set and what may cause it.
Feel free to ask me questions in the comments if you run into any problems. PLEASE like and SUBSCRIBE for the newest content. This helps me so much!!!
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Affiliate link for hoses for Amazon: amzn.to/3QWXhbC

[@jamesdean240]

WHAT! Why no rubber gloves?? OH! You're a REAL mechanic! Great video sir.

[@julesdevins2268]

Watched your video after 2 years of having this issue, and unearthed that exact problem, just ordered the boot pipe and hope this will finally fix it! Thank youuuu

[@AutoScholarwithMrB]

Glad to help. Good luck with your repair!

[@rdlcruz612]

Thank you. I appreciate the detailed specifics on how to take the pieces of the car. It was very helpful

[@bxtrclrk1710]

This is one of the better videos on this subject, but it too fails to mention a pretty common source of the vacuum leak. On the underside of the intake manifold, pointing to the rear, there are three nipples that are used as attachments for vacuum lines on some BMW models but not others. On many models, the nipples are covered by rubber caps. With time and heat the caps can crack and leak, or even fall off, thus creating an even bigger leak. Check these first. If this is the problem as it was on mine, it is a 5 minute $0.50 fix.

[@bxtrclrk1710]

@coach J If you want to go pure BMW replacement parts, any good BMW parts dealer should have replacement rubber caps for about $5 - $10 per cap. I went to Amazon, searched for "rubber caps", and got an 80 piece assortment of good quality rubber caps for about $9 that are working perfectly. (As a short term fix to verify that it is the root of your problem, a piece of tape over the end of the nipple will suffice.)

[@BigL-hk7vx]

What did u do to fix it so cheap??

[@rogervonschleusingen4603]

PUT HIS FINGER ON THE NIPPLE !!

[@lilcricket1]

it is great how well you explained the codes and what to look for

[@AutoScholarwithMrB]

Thanks for watching!

[@AuntieEm30805]

I thought I had seen this one! Missed it.

[@siwyseba4479]

great video, thank you for the recording

[@AutoScholarwithMrB]

No problem! Thanks for watching.

[@Yadadamizzle]

If you remove the cabin filter housing and the disa valve you can get to the lower intake boot hose clamps with ease. Could also move the brake booster hose.

[@jhammond4344]

Awesome video, thank you.

[@AutoScholarwithMrB]

Thanks so much for watching!

[@likits1999]

Awesome video. I have a similar situation but with a different lean bank 2 code, P1092. Nobody seems to have this code or a video for it. I replaced spark plugs. The rubber boot, the Disa valve seal and injectors seals. My ICV rattles normally. Please advise.

[@kentpayen8848]

Maybe you can guide me or any advice..03 bmw x5 3.0..code p174 and 171 I narrow the issue to the o2 sensors especially bank 2..barely reading..if I'm going down the hill without hitting the gas. All the o2s will read zero..once I stop only bank 1 will read correctly..

[@tylerkintz1425]

What if I am only getting a p0174 code and not the p0171 code? Already solving some of the vac leaks but I suspect there is still a bigger issue.

[@chucklisa8896]

Hi there, I’m not seeing the Amazon part you said you left in the description

[@AutoScholarwithMrB]

The hoses I used are here, double check your fitment though: amzn.to/3QWXhbC

[@jammyjim69]

Good video. I'm off to look for a split hose

[@AutoScholarwithMrB]

Good luck with your repair, thanks for watching!

[@jammyjim69]

Hooked up a smoke generator saw nothing at first then the tiniest of whiffs coming from the disa . Unbolted that to check the seal and found the flap had sheared off. Have just replaced it now either need to drive it or work out how to reset the throttle body after it's been running lean for god knows how long. Once again thank you

[@AutoScholarwithMrB]

@@jammyjim69 smoke machines are awesome!

[@paulteran6924]

I don’t know if it’s this part or the others parts

[@michaeldibenedetto4236]

very very nice job, did you say you had a link for the part?

[@AutoScholarwithMrB]

Here you go Michael! The link I used is dead so I found something similar. A-Premium Air Intake Boot Hose Replacement for BMW E36 E46 323Ci 323i 325Ci 325i 325xi 328i Z3 1999-2006 Front 2-PC a.co/d/esWk1Do

[@michaeldibenedetto4236]

@@AutoScholarwithMrB thank you very much, mine didn't seem bad, but it is a 2004, my car has only those two codes, PO174, and PO171, the car went into a sort of limp mode while I was driving on the interstate a week ago. after idling for 5 minute rough, I shut the car off and it started and ran fine. I changed the fuel filter, then this morning the car almost didn't start, it had no gas going to it. then it started and ran fine except the throttle was weird. I would give it gas, nothing and then it would take off.

[@701jimbo]

Hey all, I have an issue with a bmw z3 M54 2.2i. It keeps coming up with bank lean codes and misfires. Both banks and single banks, random misfires, but diagnostic says cylinder 5 is troublesome. No obvious vac leaks anywhere... fault has been getting more frequent, although the car hasn’t run much in the last six months... any thoughts??? Thanks.

[@BK-it6wg]

Solved this?

[@x4dd]

My 330ci auto failed MOT in UK emissions test, too lean. Codes p0171 and p0174 show up saying too lean and EML on. Not drivable anymore, engine just cuts out when put into D. It's 20 years old and 79,000 on the clock, looking at scrapping it because can't find out what's wrong with it except p codes. Guess getting 20 years out of a car isn't too bad 😢😢

[@walletphonekeys]

O2 sensors

[@besofacacia6103]

Nice... Did you ever have swimming lean condition on this system sir ? imagine 2 minutes it's fine and next 2 minutes trims go all the way to + 28 and back :) when trims go up engine works better. I located 2 vac leaks. Nothing changed. System is holding vacuum. unplugging maf sensor solves the stalling problem. Maf itself is good. I'm confused

[@AutoScholarwithMrB]

Normally with vacuum leaks, lean conditions would be constant. I would look at maybe a faulty front o2 sensor or a weak fuel pump. Thanks for watching!

[@JoseDiaz-lg4fn]

Will this problem make your car jerk a little when stepping on the gas and I have no problem on the freeway it’s only when I step on the gas from 0 to 10 take a min to shift to first other then that it’s runing good idk

[@Oneklickmedia]

Mines rattle/burp at 1200-3000 rpm 1-3 gear. Once I pass 45mph it run smooth. It happen when I accelerate, have to let gas off for a sec and re accelerate then rattle noise go away. It’s bottom passenger side. By the muffler? Thinking heat shield or leak from the boot. But I’ll check

[@DaniG1994]

Hi! I need some advice, got the codes p0171 p0174 and also misfire at cyl 5 and 6... It's doing some horrible noises like a sick V8 , lost power and swallows more fuel than it's used to...

[@AutoScholarwithMrB]

Sounds like you may have a severe vacuum leak. Check the parts discussed in the video. Any other codes?

[@DaniG1994]

@@AutoScholarwithMrB thanks a lot. I'll take a look tomorrow. I had other codes like p0305 and p0306 but I'll check the ingnition coils, I opened it today and the coil on nr. 5 had a little wing at the bottom burned... On nr 6 didn't see anything but I may change it also... There is one code I don't find on KZbin to solve maybe you could help me with this one... P1637...

[@DaniG1994]

@@AutoScholarwithMrB it's a BMW X3 e83 3.0i (M54 engine)

[@AutoScholarwithMrB]

@@DaniG1994 p1637 is going to be an issue with the throttle body. Check to make sure the wiring going to it is good and that the butterfly valve is clean. I would make sure your coils and plugs are changed as well. I have a video on changing them in my e46 play list. Let me know how it goes, I try my best to answer all questions in the comments of all my videos.

[@DaniG1994]

@@AutoScholarwithMrB thanks for your help! Do you have a email account to keep communicating? I think I could learn a lot of thing and save a lot of money...

[@dzeremidzeremi4232]

Hi I got a code mixture control 2 on bmw 5 series petrol can anyone tell me please what it means and how to fix it thx

[@Pumajupes]

How to do re adapt the throttle body ? Just go for a drive ?

[@AutoScholarwithMrB]

I use a scan tool but eventually it will adapt on its own normally

[@eliphastongora9461]

BMW X3 2006 SHOWS MISFIRES AND MIXTURE PREPARATION BANK ONE AND BANK TWO WITH CODEs 2882 2883 what could be a problem?/ goes rough idle in the morning for the first start on

[@AutoScholarwithMrB]

Could be vacuum leaks beyond what this video shows. You have many vacuum leak problem areas underneath the intake, within the PCV system. May also be a weak fuel pump.

[@eliphastongora9461]

@@AutoScholarwithMrB Thank i changed CCV SYSTEM AND STILL THE PROBLEM IS THERE

[@rayromada358]

Same issue I have now, I’m the morning or first start of day, I let it warm up correctly. And it will like putter or misfire when I start to drive the very first drive of the day. I replaced both intake boots, my ccv valve as well and it made a little bit of improvement I could tell but issue is still there. I am pulling both codes shown in video and my brake light is illuminated in yellow and also the half circle with the ! In the middle is yellow as well.

[@BigLongJohnson79]

I’m having the same issue the bmw guys at my store are saying it’s a cat issue and got a price quote if 5k to replace both cats for a 03 325i im confused on how it can be that any help guys

[@AutoScholarwithMrB]

A failed catalytic converter would not give these codes.

[@BigLongJohnson79]

@@AutoScholarwithMrB that’s what I’m thinking to how is that even possible I’m having the replace the whole pCv system and I’m gonna go on from there

[@melissaslater3819]

Mine just required me to clean mass air flow sensor problem fixed

[@samiquerizvi]

What is this product called so I can try to buy it online

[@AutoScholarwithMrB]

The smoke machine? You can get cheap ones like this on Amazon that work fairly well: amzn.to/3qrh6wT

[@wanabeatproduction5009]

I put header on my 2002 330ci and the check engine light on and it’s running lean

[@AutoScholarwithMrB]

It it leaking? That will cause a lean code.

[@alexvazquez5338]

How much does a EVAP diagnostic cost?

[@AutoScholarwithMrB]

It will depend on the shop, some are a flat fee and others charge by the hour.

[@eliphastongora9461]

BMW X3 2006 SHOWS MISFIRES AND MIXTURE PREPARATION BANK ONE AND BANK TWO WITH CODEs 2882 2883

[@rhizomove6631]

Where are you! I need you!

[@LeeHartley]

I always get fat codes

[@fluudzz6318]

I have a 2005 325i -P0171/P0174 & P0442 I can hear a hissing noise beside the drivers side rear wheel makes me think I have a evap leak in the system! Which would throw that P0442 but not to be certain! as far as the P0171 /P0174 I can clearly tell that the valve cover gaskets must be leaking from how oil saturated it is ! Plus my intake boot for the most part pretty dry rotted

[@fluudzz6318]

I’m wondering where to start and could it be my ccv or disa valve maybe some sort of a exhaust leak I’m about to set fire to this beautiful car #insuranceclaim

[@robeaton2191]

Great video Mr B, im having a similar problem on a 2003 M54B30 im hoping someone can guide me in the right direction. Short time ago i unintentionally run the car a bit too low on fuel (not empty) and engine light came up with P0171/P0174/P0313. Been chasing this issue for a while now as its only ever been a summer car but i really need to get to the bottom of it. Checks made - Vacuum leak test, found a small leak from ccv and sealed up Fuel pressure test came up just above 57psi consisitantly (kzbin.info/www/bejne/faqoqZioitN-bNk) 02 sensors ( pre cat operating in normal tolerances), one post cat sensor doesnt seem great been im not sure that effects fueling mix Short term fuel trims on bank 1 are normal for age of car (-5--10), short term for bank 2 are sky high at -24 MAF showing 2.9-3.9 at idle and 19 at raised engine speeds. Initially i thought fuel problem because of running low so i changed filter/regulator and no improvement, fuel pressure seems normal so not thinking pump. It runs pretty rough at idle with a definate misfire which goes after 20 seconds, idle seems to drop quite low when coming to a stop. Could someone please offer advice as i really dont know where to go from here. Thankyou

[@AutoScholarwithMrB]

I had an issue with another e46 just like this and I tested fuel volume (can’t remember the spec at the moment) and it was off. The pressure was good but the pump was slightly weak. I replaced the pump and all my problems went away. Really only caused issues at wide open throttle, which is hard to gauge with the scan tool if you are reading the data. I hope this helps! It drove me nuts for a few weeks. Thanks for watching!

[@robeaton2191]

@@AutoScholarwithMrB I know its a difficult question to answer but can running low on fuel (vehicle facing downwards) cause the fuel pump to soft fail? Thanks for your reply

[@AutoScholarwithMrB]

@@robeaton2191 any lower fuel level may overheat or suck up trash from the bottom of the tank

[@tonyrunyon375]

Get yourself a cordless ratchet and don't ever say Amazon when it comes to a BMW

[@ravsinghrajput2105]

Also try 50skid 👈