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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 05-20-2011, 11:03 AM   #1 (permalink)
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HELP!!! P0171 and P0174

I have a 2003 BMW 325Ci. My SES light is on and I pulled the codes at i got P0171 and P0174 which says the car is running too lean bank 1 and 2.

The boot is not cracked or leaking.
I checked for any vacuum leaks with carb cleaner.
I cleaned the MAF.
I checked the fuel filter.
I dont think it would be the O2 sensors because its unlikely for them both to go out, but with my luck anythings possible.

Before i fork out the $300.00 for a new MAF anybody else got any suggestions?

PCV?
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Old 05-20-2011, 11:17 AM   #2 (permalink)
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Ccv?
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Old 05-20-2011, 01:44 PM   #3 (permalink)
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DON'T change the MAF !
Does it idle roughly or even misfire occasionally?
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Old 05-20-2011, 05:59 PM   #4 (permalink)
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ccv?what does it do if you don`t mind me ask, is there a pending code , can you check your maf with a scope pattern through your scan tool. you can check you other main sensor the same way to avoid any part swapping with no leads
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Old 05-31-2011, 12:05 PM   #5 (permalink)
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it does not idle rough or ever misfire. and i really dont want to change the MAF.....
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Old 05-31-2011, 02:06 PM   #6 (permalink)
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Could be fuel pressure or tired injector(s)...
If the O2 sensors failed, I think it would run rich !!
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