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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > N54 pure stage 2 misfire and o2 codes



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      05-23-2018, 11:56 PM   #1
Msport335
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N54 pure stage 2 misfire and o2 codes

Is anyone familiar or know what the issue is when car throws 2c2d and 2c2e "lambda thrust control" codes? was throwing random cylinder misfire codes as well.

one log i pulled the STFT's were stuck at 0 when going WOT but the AFR's were very lean and hovering around 15:1 until i let off at around 4700rpm.

while monitoring MHD i notice that the lambda banks 1 and 2 are very erratic when letting off the throttle and don't always climb back up to 234.00 afr.

plugs, coils, lpfp sensor are all new and injectors are index 12...pulled plugs and none had any sign of leaky injectors. All 4 bosch o2 sensors are less than a year old.

reset all adaptations using inpa and cleared codes...logged another couple pulls and trims were reading but AFR's were still lean (around 13-14) and not reading what they should be

any help would be much appreciated.



thanks
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      05-23-2018, 11:57 PM   #2
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just replaced my pre cat o2 sensors , cleared adaptations and went for drive. Could it be my injectors now since the AFR values don't climb up to 234.00 when i let off the throttle when monitoring via MHD ?

would the post cat sensors play a role in these symptoms I'm having ?
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      05-24-2018, 09:42 AM   #3
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Anyone?
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      05-24-2018, 03:15 PM   #4
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to my knowledge, post cat sensors only measure cat efficiency, nothing to do with any kind of lean/rich mixture control.

Fueling also involves high and low pressure sensors, they can throw things off-balance. Check for your low pressure line during your runs; or just replace the 2 sensors if you haven't done so, they are cheap and easy to replace (high pressure sensor is just looking at you every day in the bay )
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      05-24-2018, 03:55 PM   #5
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just replaced the lpfp sensor as well last week and both low and high pressure pumps are doing just fine in the logs.

does that just leave me injectors? they are index 12 and less than 2 years old plus the car isn't driven during winter months.
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      05-24-2018, 04:18 PM   #6
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very unlikey injectors again...
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      05-24-2018, 04:45 PM   #7
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what else could it be...

all of the below are good/new

plugs
coils
lpfp sensor
pre cat o2's
no issues with low pressure or high pressure fuel within logs

pretty much just leaves me with trying new injectors
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      05-25-2018, 02:19 PM   #8
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post yer logs
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      05-25-2018, 03:04 PM   #9
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This was quick log after lpfp sensor and pre cat o2's were replaced

https://datazap.me/u/msport335/log-1...solo=3&mark=16
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      05-29-2018, 11:54 AM   #10
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Yeah, that's definitely sketchy...I would say at least one injector in each bank is leaking.

Interested in hearing opinions from others as well.
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