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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 04-22-2009, 03:06 PM   #1 (permalink)
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Lean Condition on e46

Hey guys,
I'm normally in the e21 and e36 forums but I know a guy that is having a problem and was wondering if I could ask you guys a question.
The car is a 2001 325i, I'm assuming its the m54 motor. Anyways apparently the car is throwing a code number P0171 and P0174 which I checked on ALLDATA and they are Bank 1/Bank 2 System too lean. I haven't seen the car myself and I can't get over to him to take a look, so I figured maybe someone had a similar problem here and had an idea. He said it doesn't appear to have an obvious vacuum leak. The guy has mechanical experience so I would say anything obvious has been checked over so If anyone has any experience with a similar thing let me know what you think.
Thanks.
-Kyle
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Old 04-22-2009, 03:44 PM   #2 (permalink)
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I believe those are codes for the Throtle position sensor. P0174 is atleast...i believe.
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Old 04-23-2009, 06:14 AM   #3 (permalink)
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I would go for the MAF sensor.
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