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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > 335i Bad Injectors do this?? Help!



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      06-16-2017, 09:32 PM   #1
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335i Bad Injectors do this?? Help!

I have a 2009 335i (E90 N54) with 95 kmiles on it. It has a lean mixture condition code -- P0171 -- for Bank 1 (cylinders 1, 2, 3). The code apparently gets triggered by the out of range fuel trim % values, like 20% to 30% (!!).

Car starts and runs good seemingly--except for tripping the P0171 a little while after a code reset, i.e. the lean condition never goes away! So spark plugs have been removed and replaced, as were the O2 sensors (pre-cat) both Bank 1 and Bank 2. Still triggers the P0171.

Picture below shows the possible story:
Bank 1 = very lean (?) vs Bank 2 = very rich(?).
So what is the fix?? Any ideas or comments?
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      06-18-2017, 12:06 AM   #2
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Are you running any tune? Jb4, MHD or Cobb? Or is stock? You could swap injectors from bank 1 to bank 2. If fault fallows the injectors you have your answer. Start with 1 to 4. Drive. If still lean on bank 1 do 2 to 5. Lastly if still lean on bank 1 to 3 to 6. This way you will find the faulty injector. If is still lean on bank 1 then issue is something else.
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      06-18-2017, 01:43 PM   #3
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Sounds like a good method--process of elimination thing, I guess. Car is stock--no tune. It's my understanding that all 3 injectors in a Bank have the same 'dash number'--e.g. -05...etc, but a different dash number in the 3 of the other Bank. If that's true you could swap all 3 from bank1 to bank2 and visa versa?? The if the the lean code gets tripped for Bank 2 (P0174?) instead of bank1 then it would narrow it down to one of the 3 injectors(?). If all 6 have the same dash number (e.g. -05...etc) the your suggested method might pay off. Would you have to do a injector calibration each time--or do you think it would matter for such a test?
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      06-18-2017, 06:27 PM   #4
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Injectors need to be coded in order operate properly. BMW recommends injectors index 1 thru 10 not to be mixed with injectors index 11 and above. However I have mixed the in the past without any adverse effect. You can read the index without removing the injector. It will give you an idea what are you working with.
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      06-19-2017, 02:15 AM   #5
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Thanks for the info--I'll have to give a try. Is it difficult to re-insert the injectors back into the cylinder head? Can it be done without any special tools? I guess I can do the coding with an USB interface (e.g. K+CAN) and program, neither of which I have. Any suggestions on what to get? Thanks.
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