2012 Mercedes-Benz C350 Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 2012 Mercedes-Benz C350
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2012 Mercedes-Benz C350 ProblemsBad Spark Plug Wires/Ignition Coils May Cause Misfires and Possible CEL
Failed spark plug wires and/or ignition coils can cause intermittent misfires (rough running); the Check Engine Light may also illuminate. Diagnoses of the ignition system will be necessary to determine which components are at fault.
Vehicles equipped with a 7-speed automatic transmission may develop a rough shifting condition, most commonly going up from first to second gear and going down from third to second or second to first gear. Our technicians tell us this is due to an internal component failure. Mercedes has released updated parts; the transmission will need to be removed and disassembled to complete the necessary repairs.