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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 > P0174 problem



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      01-15-2013, 03:44 PM   #1
oshusttoley
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P0174 problem

Ok so i know there has been other posts about this but I can't find a fix for mine. Sometimes when I do hard pull to go on highway my "ses" light comes on. It says the code means "system too lean bank 2". I have catless down pipes and exhaust on car but no tune. This is bc I bought car used and I assume the guy before me had a tune with these mods.... I heard it could be o2 sensors , hpfp or vacuum leak. What should I do and how should I tackle this without spewing money out of my wallet. My warranty is up on my car hence I am seeking advice before going to dealer or an Indy shop. Let me know what you guys think. Btw I seen people have both bank 1 and 2 codes thrown at the same time, for me it's just bank 2. Which Idk what this means. It went off like a month ago, I cleared code with buddys reader from shop he works at, and it went on again last week with same code thrown. Lmk!
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      01-15-2013, 03:52 PM   #2
oshusttoley
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Also, if my car has a dp fix? If it doesn't have the bms brand one is there another way he could of done it?
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      01-26-2013, 03:23 AM   #3
2turbodinan
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Hey buddy ...

I just got this light a few days ago too. I would really appreciate it if someone would chime in on this. I am first going to start by cleaning the MAF and see if that works. Also try dumping a bottle of fuel injector cleaner like the chevron brand, as clogged fuel injectors could also be the cause.
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      01-26-2013, 10:19 AM   #4
snowman81
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I've had this issue for a while as well, although I also get P0171 which is bank 1. For my issue, I plan on having an indy shop do a smoke test to see if I have a vac leak after I clean my MAF. If the MAF cleaning doesn't work, I'm thinking it's gonna be a vac leak. If I come up with a fix for mine, I'll post and let you guys know. Good luck.
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      01-26-2013, 01:59 PM   #5
oshusttoley
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Quote:
Originally Posted by 2turbodinan
Hey buddy ...

I just got this light a few days ago too. I would really appreciate it if someone would chime in on this. I am first going to start by cleaning the MAF and see if that works. Also try dumping a bottle of fuel injector cleaner like the chevron brand, as clogged fuel injectors could also be the cause.
For me it has to be the map sensor. I checked for vac leaks with carb cleaner and couldn't find anything. I'm going to clean that and put fuel injector cleaner. Hopefully this works!
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