![]() ![]() ![]() They dont wear out often and need to be of the Quality commensurate with the engineering in that Engine…which is to say…High Quality. Replacing the plugs probably wont hurt you either…when were they last replaced? Use the OEM plug as well…almost surely some form of Bosch Platinum…or other high quality plug…Do not skimp on the type of Spark Plug. View all 80 consumer vehicle reviews for the Used 2004 Mercedes-Benz C-Class C230 Kompressor Rwd 4dr Sport Sedan (1.8L 4cyl S/C 6M) on Edmunds, or submit your own review of the 2004 C-Class. If NO codes…you need to see if you have anything in the plug well that would short the coil to ground. If you do have an engine code…it will point to the offending plug/coil combo…after that…just replace whatever one is misfiring. Id check for codes and if there are none…pull a few coils and make sure there is no oil in the plug well…or any other liquid. Mercedes-Benz C 200 C SW 200 Elegance Selection Kompressor. Quiet, good sound system, capable performer. 1.8L L4 Supercharged Kompressor 116,000 miles, CA 95560. 2004 Mercedes-Benz C-Class C240 4MATIC AWD 4dr Sedan (2.6L 6cyl 5A) The car with 126K rides like new. Drop it off at our shop and pick it up a few hours later, or save time and have our Delivery mechanics come to you. If one of the coils is failing…you should throw a code, but I have seen many engines NOT throw a code when one of the coils shorts to ground (usually from oil in the plug well from a leaking valve cover gasket) When they short to ground you dont get a code bec technically the coil is firing but that energy is going to ground instead of thru the plug. The average cost for Mercedes-Benz C230 Engine Tune-Up is 377. I believe your engine has coil over plug system…which means No distributor, no spark plug wires…Just coils…over plugs. ![]() I would replace the spark plugs and the offending coil. Sounds like one of your ignition coils is beginning to die. ![]()
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