Misfire Codes and Mixture Control Codes

JStang · 01-09-2017, 08:02 AM

Over the past few months I have had mixture control codes but never experienced a misfire or anything abnormal. This morning, I got on the throttle a little bit and got the following codes:

P29D1 - Misfire cylinder 5
P29D0 - Misfire cylinder 4
P29D9 - Misfire, low fuel level
P29CC - Misfire, multiple cylinders

It looks like a bank 2 issue and I'm thinking possibly O2 sensor? Can anyone confirm my speculation?

Thanks!

limitdown · 01-09-2017, 09:58 AM

These are the various codes I had when my bank 2 pre-cat O2 sensor broke.

BSM n54iS · 01-09-2017, 01:41 PM

Hmm maybe low pressure fuel sensor?

JStang · 01-09-2017, 02:41 PM

Quote:

Originally Posted by Black n54is

Hmm maybe low pressure fuel sensor?

I've had that code a few times and never had a misfire from it. It has since been replaced.

Milan · 01-09-2017, 04:12 PM

I think it's an O2 sensor too

Mezzy113 · 01-09-2017, 05:50 PM

Quote:

Originally Posted by Milan

I think it's an O2 sensor too

I had a similar issue recently and I went through the following: New HPFP > new plugs > switched coils around > new injectors and, although a little better, still had issues.

It seemed to be pretty isolated (bank 1), so with there being only so many more things left to replace related with these issues I ended up having my pre cat O2 sensors replaced and that did the trick.

I would agree and go with replacing the O2 sensor if it hasn't been replaced in a long time/ever.

01-09-2017, 08:02 AM	#1
JStang Brigadier General 563 Rep 3,625 Posts Drives: FDB M3 CS Join Date: Dec 2010 Location: St. Petersburg, FL iTrader: (9)	Misfire Codes and Mixture Control Codes Over the past few months I have had mixture control codes but never experienced a misfire or anything abnormal. This morning, I got on the throttle a little bit and got the following codes: P29D1 - Misfire cylinder 5 P29D0 - Misfire cylinder 4 P29D9 - Misfire, low fuel level P29CC - Misfire, multiple cylinders It looks like a bank 2 issue and I'm thinking possibly O2 sensor? Can anyone confirm my speculation? Thanks!
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01-09-2017, 09:58 AM	#2
limitdown First Lieutenant 187 Rep 337 Posts Drives: 2007 335i E93 Join Date: Jul 2015 Location: Location iTrader: (0)	These are the various codes I had when my bank 2 pre-cat O2 sensor broke. Attached Images
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01-09-2017, 01:41 PM	#3
BSM n54iS Brigadier General 2685 Rep 4,203 Posts Drives: '11 335is \| '16 Macan Turbo Join Date: Aug 2015 Location: Everywhere and Nowhere iTrader: (7)	Hmm maybe low pressure fuel sensor? __________________ '11 335is BSM MT "BMW Performance Editon" \| '16 Porsche Macan Turbo GruppeM CF Intake \| AR Resonated DP \| ER CP \| Turbosmart RacePort BOV \| Cobb FMIC \| RB Inlets \| RB External Mishi/Turner OCC \| Michelin PS4 \| BMW Performance Springs/Bilstein B8 + Dinan & M3 bits \| BMW Brembo BBK \| BMW Performance CF Spoiler \| BMW Performance CF Lip \| BMW Performance Alcantara \| PS Designs GTS Armrest \| AG H6-40 \| Rear Seat Delete
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01-09-2017, 04:12 PM	#5
Milan Captain 202 Rep 649 Posts Drives: F80 M3 Join Date: May 2014 Location: Boise, ID iTrader: (7)	I think it's an O2 sensor too __________________ 17 M3 Comp
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