Member
Could use some advice...
Got both SES 171/174 error codes on a 2005 330i.
Cleaned MAF and checked hoses.
Is there a way to bench test a MAF sensor? I saw a test where you disconnect the MAF and it there is no change in the way the engine is running it is bad. Also read about a voltage and a atmospheric pressure test.
Also, where's a good place to get a new MAF at a reasonable price?
Seems like prices are all over the place for a new replacement.
Thanks in advance!!!
Member
FCP Euro provides a LIFETIME warranty for any part they sell. An OEM MAF is not cheap ($225 for VDO/Seimens or $300 for one with a BMW logo). FWIW - I've had a cheap EBay MAF in my car for almost 2000 miles with no issues.Originally Posted by Lilredpo
Before you start throwing parts at your car for what is the most common codes a M54Bxx will throw, have the car smoke tested for vacuum leaks. A 'soft failing' Fuel Pump can cause those codes too. I battled these very codes for a while myself but since I installed a new Fuel Pump and replaced the DISA (which failed a vacuum test), I've not seen them again.
Last edited by All2kool; 12-03-2017 at 05:57 PM.
Member
failed MAF's are extremely rare unless you've been running an oiled air filter.
Its almost always vacuum leaks, have it smoke tested.
Current:
- 09 335i MSport, FBO.
- 98 Euro M3, Estoril Blue
- 04 M3, Carbon Black, 6 Speed Coupe
- 06 M5, Black on Black, Full Leather.
- 73 3.0CS, Tagia Green, 5 speed M30b35 converted
Ex's: 1984 325e, 1988 325IX, 1992 525I, 1995 540i/6, 2002 330i, 2005 330xi, 1992 850i, 2003 330i #1, 2003 330i #2, 2002 330ci, 2004 330ci, 2007 328CI, 2007 335i, 2001 M3, 2006 M5 6 speed
Robert Denali
^ this and
Get MAF cleaner. Don't use brakekleen or anything else on it and don't touch the wire with your hands.
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