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  #1  
Old 01-02-2004, 05:08 PM
blueeagle289's Avatar
Blue Eagle
 
Join Date: Nov 2003
Location: Dallas, TX
Posts: 457
Intermittent Check Engine Lights

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)
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Old 01-02-2004, 05:27 PM
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Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
MORE than likely the MAF sensor. If you can read freeze-frame data for the CEL illuminating event (fault code), then look and see what the fuel-adaptation number was. Usually you see it maxed out, up around 1.31 or so. You also need to be sure that the O-ring at the end of the MAF sensor is installed correctly and no leakage at the end of the intake pipe.

Gilly
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  #3  
Old 01-02-2004, 08:15 PM
blueeagle289's Avatar
Blue Eagle
 
Join Date: Nov 2003
Location: Dallas, TX
Posts: 457
ML 320 CEL's

Thanks, Gilly ..... I will check that out more specifically. 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)
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  #4  
Old 01-10-2004, 02:21 AM
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Join Date: Sep 2002
Posts: 302
Air Mass Sensor

Its definitely the air mass sensors, I can get them for $200US, half the price off dealer...
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