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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 10-31-2009, 10:29 AM   #1
hus23
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P0174 P0171 codes, system too lean bank 1, bank 2

I have an 03 325i. I am getting P0174 and P0171 codes. I took it to an independent shop, who erased the codes, and suggested that it may be an O2 sensor problem. Before I hit a 100 miles, the codes came back.

I've seen several theories as to why these codes happen, relating to the MAF sensor, or the intake/vacuum hoses. Is there an easy (hopefully inexpensive) definitive fix? The car runs fine except for the engine light keep coming back on.
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Old 10-31-2009, 10:38 AM   #2
330ciandr6
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check your lower intake boot elbow. most common problem.

then check oil separator lines
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Old 10-31-2009, 11:05 AM   #3
Hinman
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check your MAF, that was my problem.
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Old 10-31-2009, 01:24 PM   #4
xe460
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I got those codes a while back and it turned out to be my fuel pump was failing and not enough fuel delivering to the engine. I tried to fix other things but finally pump died after two weeks and it was really the final culprit.
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Old 10-31-2009, 01:27 PM   #5
BMW_Matt
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Lol ironic I have the same code along with p0313. I'm gonna follow drew's advice and clean my MAF. Lemme know if you get it fixed and what it was.
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Old 11-03-2009, 02:38 PM   #6
hus23
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Thanks!

I took it down to my buddy's place, and after a lot of searching, we found a small pin hole in the intake boot. It took a while since there are a lot of ribs around it, but there was a slice with a small hole in the middle there. We put some silicon on it, and cleared the codes. So far they haven't come back.

Thanks everyone.
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Old 01-26-2010, 05:36 PM   #7
hus23
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A quick update: After a few hundred miles, the codes come back. I ended up buying both intake tubes. Part #'s 13-54-1-435-627, and 13-54-705-209 ($35 total). Both of the old tubes had numerous cracks in them, and so far the codes haven't came back.
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Old 01-04-2012, 03:08 PM   #8
ima_UNC_fan
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+1 for hole in vac hose...just fixed mine.
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