Gilly: I have had some CEL's over the last few weeks, on my 1999
ML 320 and my code reader always shows them to be PO 170 or PO 173 .... Fuel Trim, Bank One or Bank Two.. The car is running perfectly; are these lights indicative of a pending problem with the EGR pipe or MAF or something of that kind... thanks, Ben Carter

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Ben Harrison Carter
1999 Mercedes ML320 87K
1992 Mercedes 300CE 89K
1995 Corvette 29K -- Sold Dec 09
1989 Mercedes 420SEL 99K -- (Sold 4/08)
1968 Mercedes 230S (106K) (Sold 9/06))
1976 Mercedes 450SEL 130K (Just sold - 06)
1961 Mercedes 220Sb (sold years ago)