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Old 01-06-2004, 06:45 AM
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Join Date: May 1999
Location: Calgary, Alberta, Canada
Posts: 190
1998 C230 Check engine light, codes P0300, P0301, P0302, P0170.

My fathers C230 check engine light came on recently. I read the codes with an OBDII scanner. I recieved codes:

P0300=Random/Multiple Cylinder Misfire Detected
P0301=Cylinder 1 Misfire Detected
P0302=Cylinder 2 Misfire Detected
P0170=Fuel Trim Malfunction (Bank 1)

Any ideas of where to start looking? I am planning on taking the wires and plugs out to check on their condition. I have read on this forum that the MAS is a problem area on this model. I hate to buy it first without knowing for sure.

Thanks in advance,
1997 E320
1990 Nissan 300ZX Twin Turbo (Stage X+)
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Old 01-06-2004, 08:03 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
More likely than not the air mass sensor is reporting back incorrect info to the fuel computer & the fuel mixture is too LEAN.

With many scan tools live data is avail, look at self-adaptation figures. IF the correction factor is around 1.3 then you need a new MAS.

That also should correct the mis-fires as well.
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