So, I get my car back from the Stealership and they informed me that my "Check Engine" light came on as a result of a spark plug missing. The day prior my light came on and the car ran rough sooo I opened up the hood and thought is could be a "spark" problem so I pushed down on the spark plug caps and I made sure all hoses were connected firmly. I fired it back up and the problem went away but since the car is still under warranty I took it in to get it checked out. The Service advisor (are they commisioned paid?) said that I needed new plugs all the way around...and at only $450.00 what a bargan. Forget about the fact that they could not replicate the problem in the shop and it didnt happen to them when the took it out for a test drive. I guess I am a bit curious, if my plug was failing it would FAIL not fail intermitantly right? Also, I have driven it since this diagnosis and no problems (nock on wood). I must say that I live in North Texas and sometimes my GPS takes me on country bumpkin roads (of which I will NEVER drive my MBZ on again). I belive the rough gravely road caused the plugs to vibrage loose....ANY suggestions would be great. I just asked them to clear the code and give me my car back and if it happens again I will know what to do next. I just didnt feel right spending $450.00 on a guess.

 

>>(are they commisioned paid?)<<

Ya boy!

 

Yes they are commisioned pay.......Plugs can go bad intermitantly... How many miles on the car?? Plug wires and coils also go bad... if your car is under warranty then you shouldnt have to pay for spark plugs..

 

My C 280 is a 1999 and yes, it still is under the warranty so are you absolutly sure that the plugs would be under warranty????