Thanks MB Doc
I hooked up a scanner, and it came up one unknown code, and the other the sensor. I ordered one. Hope that fixes it.

What got me ws the CEL clearing itself. Shouldn't the CEL stay lit until cleared?

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Thank You!
Fred
2009 ML350
2004 SL600
2004 SL500
1996 SL600
2002 SLK32
2005 CLK320 cabrio
2003 ML350
1997 C280 Sport