[cyberdrakon]

Argh!!! of course the check engine light comes on at 50,006 miles, 10 miles after getting the car from the dealership for some warranty covered repairs. Any suggestions? I am handy with tools, but no idea where to start with just the Dummy Light on. I would much rather have the dealership take care of this, but it's kinda hard i assume?

 

[ML320Owner]

OK, it's easy. Go back to the dealer and complain that you just had service and now there's a CE light on. They will read the codes from the OBD computer. There's plenty of info about the typical causes on this forum (usually the Mass Air Flow sensor or 02-sensors). It's an easy DIY repair but the parts are expensive.

 

[CaliE320]

Eddie,

My warning light just came on my ML to. Turned out to be a bad o2 sensor.

~Cali

 

[dfskinner]

what did it cost to have th O2 sensor problem fixed?

 

[MOUSE]

I too just got my ML 430 back from the dealer and within 10-15 miles my chech engine light turned on.
They said check the gas cap with engine oof and restart the truck. No Go! Must bring it in for engine test.

 

[cyberdrakon]

Thanks for the suggestions. The dealer took the car back for inspection, will post results in a couple days.

 

[S4toML]

If you have access to an OBD tool, check for error codes. You'll certainly find atleast one DTC

and when you do, run a search here. You'll find a lot of suggestions from those who previously had the CEL problem.

 

[CaliE320]

RE: If you have access to an OBD tool, check for error codes. You'll certainly find atleast one DT

It was $250 for the O2. I could've gotten it done cheaper at Mr. MB, but I needed the dealer to work on some cosmetic issues...

~Cali