2020

Got "check engine" light. No messages to explain any faults. Car seems to be running properly. Oil level is good. Any other place to check? or go to the dealer.

2012 merc amg

Dealer, not normal. They can read the code or you could too if you have access to a can bus code reader, generally advance auto parts has them for use if you cant get to the dealer.

E63Wsantini

My wagon is currently in with the dealer for the same thing after 3K miles. They not sure what the problem is but looking to change spark plugs and coils. I'll post once I know more.

2012 merc amg

First thing I always check is for loose gas cap or bad gas cap seal.

E63Wsantini

Got my wagon back from the dealer and the service report found a misfire at cylinder 11 and 6 ?! Replaced coil and spark plugs. After 4K I'm not convinced.

nynd

I'm guessing you meant Cylinder "1" ... "11" would mean you have something unique.. lol

simarddominic

I had the same thing 3 or 4 times. And when It was alight, for a short period of time, the driving modes are no longer accessible.I went to my dealer yesterday and my mechanic told me that there was a reprogramming bulletin because the computer could momentarily lose some reading from the differential and transmission, which cause this protection mode.

It was done on mine and everything seems ok. If it does not correct the problem, the source of trouble is then "pins" of a connector.

The problem is reported and known by Mercedes and frequent on M177 engines.

2020

Thanks for the info. I had that happen 2 days ago whereby I had the "check engine" light and for the first time I was not able to access the driving modes. I tried starting and restarting the engine to no avail. It reset itself today after 2 days. I'm just worried if I take it to the dealer most likely they will tell everything is fine.