[Rickygst]

My car is at the dealer right now. I'm not having power loss. This has to be something simple. Dealer has not figure it out. I will keep you all posted on what I find out.

[Rickygst]

slostjoe, which codes are you getting. Is it just the 29e1 code or is there others?

[slostjoe]

I've gotten misfire codes and I assume it was just because of my NLS module. I've gotten a couple T map codes and a couple throttlebody codes nothing consistent.

I'm literally replacing everything on my car to trace down this issue.

[E90Flossin]

I am also receiving the P29E1 and P2AAF. I am running Stage 2 cobb aggressive with the mix of E85 and 91 octane. I believe it's the fuel mixture. Also feeling loss of power, but maybe that's just me? Anyone have a clue?

[Rickygst]

So I been driving the car for about two weeks now. The code has not come back since the injectors replacement. So my problem seen to have been the injectors. I was getting the 29e1 code before the new injectors.
So anyone getting this code, here are some things to look for. Air getting in somehow, may need to smoke test, Fuel related (injectors, fuel pump, etc.), maybe carbon buildup (Unlikely the cause but a problem), verify o2 sensors are working (Most likely not the issue but check anyway). I was on a stock tune.
Hope this helps someone

[joec500]

Originally Posted by Rickygst

So I been driving the car for about two weeks now. The code has not come back since the injectors replacement. So my problem seen to have been the injectors. I was getting the 29e1 code before the new injectors.
So anyone getting this code, here are some things to look for. Air getting in somehow, may need to smoke test, Fuel related (injectors, fuel pump, etc.), maybe carbon buildup (Unlikely the cause but a problem), verify o2 sensors are working (Most likely not the issue but check anyway). I was on a stock tune.
Hope this helps someone

I also had a persistent 29E1 code...I replaced all 3 Bank 2 injectors and the code has yet to return for 2 months.

[Indo Rider]

What kind of issue with a fuel injector could cause this code but not result in some other perceivable issue like a misfire or the plug on that cylinder looking fouled?

This code keeps coming back but I haven't been able to track it down conclusively. Seems neither has anyone else... Anybody got any updates?

[westchester335i]

bump for updates

Got this code last week and after 1k miles its back. I just keep clearing it. Had a boost leak but fixed it and car runs and pulls fine.

[tb30570]

Hi All,

I have a 2008 335xi that is keeps getting p0175 Rich Bank 1 & p29e1 Mix Control 2 codes together.

I'm not getting misfire codes.

Do mix control 2 and bank 1 cover the same cylinders? Could the o2 sensors be switched around?

What should I do first?

Car Background:
-idle isn't rough but not super smooth either
-New spark plugs about 10k miles ago
-Catless downpines
-Larger CXRacing intercooler
-93 octane E10 gasoline
-Cobb Stage2+FMIC Aggressive tune

[Bimmer Barney]

I'm also gettin 29E1 and from my research the suggested causes (most suggested causes) are injectors, O2 sensors and/or LPFP.

[StevanM5]

Also get the 29E1 f***ing code.
Car is double FBO

replaced O2 front Bank 2 sensor
Cleaned my injectors via ultraschall
Do a valve clean
ngk´s 10k on the car
HPFP new
LPFP inline 255

driving the jb4 e85 flash e50

will try now to drive without e85
Maybe the problem is the winterethanol in germany.
it´s not e85, it´s e75 in the winter month

[KeepRidingDirty]

+1

My 29E1 codes were from my injectors dumping fuel into the cylinders while sitting overnight (leaky injectors) causing it to run rich. If your not running E85 or an ethanol mix this is most likely your culprit.

Originally Posted by Bimmer Barney

I'm also gettin 29E1 and from my research the suggested causes (most suggested causes) are injectors, O2 sensors and/or LPFP.

[Tim603]

Originally Posted by Indo Rider

What kind of issue with a fuel injector could cause this code but not result in some other perceivable issue like a misfire or the plug on that cylinder looking fouled?

This code keeps coming back but I haven't been able to track it down conclusively. Seems neither has anyone else... Anybody got any updates?

You could be running a little lean or rich and not have a misfire, as far as the plug fouling, it only takes a little less fuel than required to be lean and that may not be represented on the plug.

[Jeffman]

I'm interested in reviving this thread as my p29e0 and p29e1 codes are back after switching back to 93 octane from E40. Here are some Observations/Comments/Questions/Thoughts/Musings/Ideas:

1. p29e0 and p29e1 happen only when car is cold (like sitting overnight when it's 40F or lower outside).

2. These codes don't appear immediately upon starting the engine. Takes at least a few minutes while idling or simple cruising - no WOT or high revving.

3. This is really interesting: I never got these codes for several months, including in cold weather recently, with my latest E40 map that I created using Cobb ATR. My E40 scalars were very high (1.4-1.5) to bring my STFT trims down below 20 during WOTs.
So I'm wondering what tuning parameters could possibly be adjusted to help prevent these lean codes from appearing - maybe adjust up the fuel scalars? My 93 oct ATR map has 3D scalars starting at 1.04 (from 1.00) at idling. Still getting the codes. I'll probably up the scalars to 1.1.

4. These codes first appeared last year after experimenting with E85 (I had started several threads in 2013 about this). Going back to the stock tune did not eliminate these codes at the time.

5. A previous poster suggested leaking injectors could cause these p29e0/p29e1 codes. But aren't these codes triggered in a lean condition? I'd expect leaking injectors dumping fuel into the cylinders overnight would cause a rich condition?

6. Ethanol has about three times the viscosity as gasoline (about 1.1 cP versus 0.4 cP at ambient temp, I think). Ethanol / gas blends would probably be somewhere in between. E40 would like be twice as viscous as E10; much more so in cold weather. Could the injectors be slightly permanently deformed somehow using cold E40 one morning? (I need to go look at the injector designs). Then switching back to gasoline might later result in leaking - remember, gasoline has lower viscosity.

7. Materials contract in cold weather. Upon starting a cold engine cylinders warm first, followed by parts (e.g., injectors, and fuel runners) connected to the engine. Could thermal expansion mismatch result in a lean condition?

8. Cold fuel in tank has higher viscosity and thus harder for the LPFP to pump.

Any thoughts or comments from anyone?
Thanks, and happy new year.

[Jeffman]

9. Colder temps -> colder air -> more oxygen -> leaner mixtures if the engine is not properly compensating for colder temps.

[Jeffman]

10. A lot of the problems mentioned by people in this thread happened in the winter. Spend 2-3 months trying to solve the problem - parts, dealer, etc. - then something seems to work. Changed O2 sensors, changed injectors, changed tune, changed gas, etc. All different solutions and everybody seems to have a different answer. But one thing everyone seems to have in common is p29e1 appearing in the colder weather months at it going away a few months later.

[tb30570]

Originally Posted by Jeffman

10. A lot of the problems mentioned by people in this thread happened in the winter. Spend 2-3 months trying to solve the problem - parts, dealer, etc. - then something seems to work. Changed O2 sensors, changed injectors, changed tune, changed gas, etc. All different solutions and everybody seems to have a different answer. But one thing everyone seems to have in common is p29e1 appearing in the colder weather months at it going away a few months later.

maybe the AIT2 sensor is bad on all our cars

[AZEgg3]

I had a couple misfires on cylinder 3, I replaced the coil and then had misfires on cylinder 2, and 1 time on cylinder 3 (cleared and hasnt returned). new plugs have about 10k on them. I have also had the same 29e0 code, but all these only happen upon startup when its colder outside, normally below 50 at night. It only happens right after startup, within about a minute, and after I clear the codes they dont return until sitting over night again, sometimes not for a few days.
Is the next step injectors?

[e91 335i]

Hello guys!

I'm having similar issues. Codes 29e1 and 29e0 appear and the car runs rich. At WOT the boost is not hitting target (15psi vs 19psi) but no misfires appear. When cold the car starts fine but when hot I'm having long cranks and strong gasoline smell. Any ideas? The HPFP is about 1 year old and plugs about 1000 miles. I'm running e85 flash and about e50 blend. I also had one bank2 o2-sensor issue but after changing post-cat o2 sensor I still have those fuel-mixture codes.

[Spun Crankhub]

Anyone recently have any luck on solving 29E0 and 29E1? My guess is its a crap shoot between the usual plugs, coils, injectors, etc...

[loweredram]

Hopefully this helps some guys. I was having this same issue Im FBO cobb tune, new updated injectors, NGK 95770 (6 months old) No fuel on plugs after short cold start , new valve cover and gasket , O2 sensors all replaced about 3 years ago. Kept getting that damn code 29E0, 29E1 when cruising at highway speeds!!! I was just about to start throwing money at new O2 sensors for Bank 2 and new plugs when I came across an E90post where ( for the life of me I cant find again) a guy mentions the MAP sensor when not working properly will affect LTFT and STFT. At first I was thinking not possible because wouldn't I get a code for both banks? Well purchased the sensor a month later still code free!!! I used to get the code every so often running E30 and now I don't even get it with that anymore.

Hope this helps

[King Rudi]

My 335i threw a code last week, had it checked, it was the MAP sensor. I cleaned the sensor and had my indy clear the code. As he was scanning for codes, the 29E1 code popped up. Makes me feel better to know that cleaning the MAP sensor fixed the first code, but the fact that this one has now appeared makes me think I may need to revisit. It is possible that the seal around the sensor may not be seated properly. As of now I am error free, but I'll see how it goes for the next few weeks and report back with findings.