Check for any air leak. I replaced my MAF before and didn't tide one of the air hoses. After a couple of drives, it came off and had the 3 warning lights/no power problem while driving, one day.

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2010 X6 50i
2005 X5 3.Oi, Many Options
2015 HONDA CR-V EX-L
1998 ACURA 2.5TL

MODs
- Driver's outside mirror light
- Voice Recognition Module
- Blaupunkt Entertainment System
with Digital TV