CODE P0171 P0174 SYSTEM TOO LEAN VACUUM LEAK FIX BMW E46

CODE P0171 P0174 SYSTEM TOO LEAN VACUUM LEAK FIX BMW E46 325I 330I 328I 320I 323i 325xi 328xi 330xi 320xi 330CI 325CI 320CI
If you have BMW and you have code P0171 System Too Lean Bank 1 or code P0174 System Too Lean Bank 2 this is the right video. Code P0171 and P0174 are known as codes triggered by vacuum leaks. Most of the times code P0171 and Code P0174 cause by intake leak, vacuum leak, or leaking gasket and the engine will get more air than it measures through the maf. We demonstrated how to fix code P0171 and Code P0174 on BMW e46 330ci but it should be helpful on many models since they all share the same M54 engine:
1998 BMW e46 Code P0171 System Too Lean Bank 1, Code P0174 System Too Lean Bank 2 325I 330I 328I 320I 323i 325xi 328xi 330xi 320xi 330CI 325CI 320CI
1999 BMW e46 Code P0171 System Too Lean Bank 1, Code P0174 System Too Lean Bank 2 325I 330I 328I 320I 323i 325xi 328xi 330xi 320xi 330CI 325CI 320CI
2000 BMW e46 Code P0171 System Too Lean Bank 1, Code P0174 System Too Lean Bank 2 325I 330I 328I 320I 323i 325xi 328xi 330xi 320xi 330CI 325CI 320CI
2001 BMW e46 Code P0171 System Too Lean Bank 1, Code P0174 System Too Lean Bank 2 325I 330I 328I 320I 323i 325xi 328xi 330xi 320xi 330CI 325CI 320CI
2002 BMW e46 Code P0171 System Too Lean Bank 1, Code P0174 System Too Lean Bank 2 325I 330I 328I 320I 323i 325xi 328xi 330xi 320xi 330CI 325CI 320CI
2003 BMW e46 Code P0171 System Too Lean Bank 1, Code P0174 System Too Lean Bank 2 325I 330I 328I 320I 323i 325xi 328xi 330xi 320xi 330CI 325CI 320CI
2004 BMW e46 Code P0171 System Too Lean Bank 1, Code P0174 System Too Lean Bank 2 325I 330I 328I 320I 323i 325xi 328xi 330xi 320xi 330CI 325CI 320CI
2005 BMW e46 Code P0171 System Too Lean Bank 1, Code P0174 System Too Lean Bank 2 325I 330I 328I 320I 323i 325xi 328xi 330xi 320xi 330CI 325CI 320CI
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[@stewartcollie2459]

Excellent video. Let me add one more thing to look for on the list of potential air leaks. I have a 2003 Z4, 2.5 engine. It would throw "system too lean" codes, both banks. I isolated the problem to times when it was idling. That usually points to vacuum leaks. After repeated inspections of every hose even remotely associated with the intake system downstream of the MAF I could never find the leak. What I did find, ultimately, is a small black plastic pipe sticking out of the rear of the intake manifold. It is clearly meant to be used as a vacuum source, but it is not used for anything in my car. It is meant to be capped, (or plugged in some fashion )but the cap had fallen off, allowing a substantial stream of air directly into the intake manifold. I capped the pipe and the codes went away. A $0.05 part after 20 hours of looking.

[@TJones-bf1rj]

Can you post a photo?

[@euthopialis7031]

Im chasing the same thing on my 2003 2.5 z4 as well, have any videos on what you did?

[@idoubtit4671]

You're the best!! Nobody else SHOWS and explains better than you did in your video.

[@williamlynch6095]

You are very good at explaining thanks

[@user-mr3vw6xg7o]

👍🏼alot of knowledge thanks brother

[@bizzybgoodson632]

Thanks bro keep up the great work and news

[@ASMRAesthetics]

Your videos are so helpful! I love trying to fix my car myself and I have had great success with your help. I just replaced the fuel pump in my 04 325ci, it’s running much better but the PO174 & PO171 codes are back 😖.I am going to do a visual inspection and now that it’s running I’ll probably try to spray some carb cleaner in the mentioned areas. Thnx.

[@walletphonekeys]

O2 sensors

[@robertlorimer843]

Great video! Thank you!

[@krazycara8381]

Great video!!

[@dexietyy7922]

Can a leaking sump gasket cause this? And oil burning I’ve read online it can cause pure oil to go up through the ccv system

[@JBBURG666]

Thank you very much for the info

[@sameerullashariff8770]

Good morning good job

[@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..

[@terevispepper1327]

really good video. thanks

[@Everybodyshinetogether1]

What’s the cost for?

[@neilbreakwell4500]

Thanks for another great video .. My scan tool (XTool D7) gives the following codes: CA - DME Fuel trim bank 1 control limit CB - DME Fuel trim bank 2 control limit but doesn't indicate whether the trims are positive or negative .. just on limit Are these the same codes as P0171 and P0174 ? Thanks

[@sonofsteve566]

if Bank 1 is Max Rich & Bank 2 is Max Lean, short and longterm trims. just by fuel trim reading What direction would you begin???

[@beethoven8256]

I have the same model as yours. 😇

[@BrightmoRo]

I have those codes pulled up, my scanner is saying misfire in every cylinder, my question is will those codes be made because of running lean?

[@e60_guy40]

Hello , it’s of the topic but i have a situation and I’m stuck in the middle but can’t find any answer so i hope you can help me out . i wanna retrofit CC to my car , my car doesn’t comes with this function I already bought CC stalk and added $540 to VO and default coded DSC LMA CAS MASK KOMBI but still no use , any help please I’m stuck in this situation now

[@chrisyo295]

I don't have this code but i have a P1093 any suggestions. Thank you

[@robdixon6862]

what about valve cover gasket? Is that a possibility. I noticed that when I remove the oil cap while care running there is only a very slight suction. It's not strong. What does this mean?

[@noahzm_]

Pcv , you need a new valve cover

[@giovannidicapo6213]

QUESTION -- Would running he vehicle low on gas cause these codes to come on? I drove my 2001 BMW 330Ci to the point whereby gas light came on but I did these 3 consecutive times. So I almost ran out of gas and then I only put a little in it -- almost ran out of gas again - put a little more in it -- and almost ran out of gas again - could this cause a vehicle from running lean? And yes --- IT'S DUMB to do this but for personal reasons, I've been preoccupied. Please let me know what you think. Thx a bunch!!!!!!!!!

[@kendtchileninjah5905]

Not sure if this will help but I never let my tank go below half and I’m still showing these codes.

[@paulteran6924]

Makes sense

[@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.

[@vince355]

Check behind intake manifold for hose that needs a cal and spark plugs for oil on my car oil in spark plugs caused engine to run lean with random misfires because of my valve cover

[@simplelangperorock]

How about P00BC (MAF sensor)? Together with lean P071/P074 codes? What could it possibly mean?

[@rolandodimaano292]

Same page here, p00bc first then 171 and 174 will follow.

[@simplelangperorock]

@@rolandodimaano292 thx. I changed the MAF sensor. Fixed it. Then, 171 and 174 disappeared after I changed the gaskets on the DISA valves. So far, it is all good now.

[@rolandodimaano292]

@@simplelangperorock my maf is new, continental brand. Got new gaskets too. New pcv hose. I will have to perform vacuum leak test.

[@rolandodimaano292]

@@simplelangperorock I have a N52 so no disa valves

[@jammy46235]

Good way to find leak is use a fog machine rig up a hose of some sort and attach it to a vacuum line and blow smoke in it and look for smoke escaping boom you found your leak 25 dollar for machine worth every dime 😉

[@sajid1891]

How about the disa valve?

[@TheIsojukka]

it is common place to leak, i needed to change it and it was complitly broken. but i still have those codes. i have changed all vacuum hoses, those plugs behind air intake manifold, cracked rubber intake pipes, all crankcase ventilation parts. i think my cars vacuum leak is because broken vacuum hose near fuel filter, craked intake manifold gasket or that weird rubber seal near throttle housing/idle regulating valve(part n.11 61 1 437 453).

[@scottkucinski4967]

I have a both lean codes plus cylinder 2 misfire could a bad coil in cylinder 2 cause the codes?

[@aceprodigyz5819]

Maybe, mine threw misfire in cylinder 6 because of the other codes

[@tarzan30809]

My 2004 e46 with 233K miles had two electronic engine failures in the past year. The first time while driving in a cold dark morning with the fog lights, radio, heather on. The dashboard lights light, with an alarm sign, the battery sign and transmission and brakes not working properly. Because my office was just a few blocks away I was able to get to work and parked the car. I the afternoon I got to the car start it without problems and drove home without any issues, checked the battery and the alternators and it showed that the battery was to maintaining the charge while the engine was running and the electronics of the car were on ( fog lights, a/c, seat heather etc.) the charge will drop gradually from 13.5 volts to 11 volts or less. Because of this I changed the alternator. This past week while driving in a cold nigh same thing happened again, with the alarm signs, battery signs, and I stopped the car and re-started it without issues except code P0174 was on. The hoses and seals of the car look ok. Any suggestions for this fantastic car!?

[@loonneye]

Did you figure anything out? I'm having the same issue. I'm going to fry some MFA cleaner.

[@tarzan30809]

New battery solved the problem@@loonneye

[@loonneye]

Thanks!! I found a second vacuum leak under the hood. A smoke machine found it. @@tarzan30809

[@F1LmMclaren]

why no MAF relocation kit to next to throttle body lmao

[@NicoleCHall]

I have 2005 x5 3.01 with these codes so far we replace pc valve & air intake boot. The ✔ engine lite came back on. Please Help. Thank u

[@moihawk666]

maf, and or intake gaskets?

[@NicoleCHall]

👌 thanks . It needed O rings all good 4 Now

[@chriskellyson3537]

Was it ur fault pump

[@chriskellyson3537]

Was it ur fuel pump

[@djapebosanac7702]

I got code P0171 but i dont have a vacuum leak !