Reusable K&N filters are known to throw oil which will foul the MAF. If you haven't done so, try cleaning the MAF with C&R MAF cleaner. Note - Insert must be removed to spray on sensor. Fasteners are usually Torx Plus (5 point).

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Good luck.






1998 E320 Wagon

The K&N and Mass air flow are only a few days old along with the other items I listed.

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1999 SL500
2003 C32
2002 S55
2004 S430
2003 E320
2004 E500