P0171/P0174 code; cost to fix?
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P0171/P0174 code; cost to fix? Expand / Collapse
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Posted 5/26/2009 3:16:29 PM
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hello-
04 330ci 47k miles with the ses light on. pulled codes from autozone, and a bit of research suggests to do the following
- clean MAF sensor
- check for vacuum holes / leaks.

my car is also experiencing a 'whistling' sound (like a turbo engine would) when accelerating; the engine also stutters upon start up.
read that the whistling is prob due to leaks / holes in hoses.

i am not a diy guy, can anyone hazard a guess as to how much this will cost? and perhaps a recommendation where to bring (i live in the metrowest area)

thanks in advance!
jonathan
Post #1837
Posted 5/26/2009 3:34:45 PM
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Cleaning the mass flow sensor will not likely cure your problem. If you believe you have air intake leaks, the intake elbow(s) after the mass flow meter are most suspect. That whistling sound may be a symptom of a clogged up crankcase ventilation system. Relative to the shudder upon start up, that needs to be observed.

At www.bimrs.org you'll find many capable independent BMW repair shops that can help you.

Good Luck!


Mike Morris
Schneller BMW Performance
26 Middle Rd Unit 1-2
Newbury, MA 01951
978.465.2002
Post #1838
Posted 9/26/2009 4:22:02 PM


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My '01 325I w/160k has recently started intermittently throwing the p0174 code as well. After clearing, the SES light will stay off for several days, then come back. I have visually inspected the intake tube after the MAF as you suggested, as well the other obvious vacuum hoses, and can find no cracks, all connections seem tight. Would the soapy water on the hoses and connections trick be worth trying? Is there anything else I should be checking for? Should I just replace the o2 sensor?
Post #2219
Posted 9/28/2009 10:20:32 AM
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We check for vacum leaks by spraying carb cleaner along the intake boot, throttlebody, & intake manifold gaskets (essentially, everywhere there is a connection or gasket after the massflow meter). A change in idle will occur when a leak is detected.

Other things to check relative to this code are the oil filler cap (On tight? Gasket Good?), Leaking valvecover gasket, clogged crankcase ventilation system (Ever had it replaced? If not I'm sure it's got some problems by 160K). Finally, pre CAT O2 sensors could also produce to this code, although it's not likely that both banks would have the same fault at the same time.

Good Luck!


Mike Morris
Schneller BMW Performance
26 Middle Rd Unit 1-2
Newbury, MA 01951
978.465.2002
Post #2222
Posted 9/28/2009 11:12:43 AM


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Thanks for the advice, Mike.

David

Post #2223
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