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!!!
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.
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.
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
^ 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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