Mercedes-Benz C-Class: Common Problems, Fault Codes & Repairs Everything for the Mercedes-Benz C-Class in one place — its common problems and reliability, the fault codes owners see most, and the tools to diagnose them. Mercedes-Benz C-Class fault codes Mercedes-Benz C-Class P0420 Mercedes-Benz C-Class specs & capacities Mercedes-Benz C-Class — Fuse box location & guideMercedes-Benz C-Class — Oil capacity & typeMercedes-Benz C-Class — Tire pressureMercedes-Benz C-Class — Bolt pattern & wheel sizes Recommended tools Automotive MultimeterCompression TesterBattery & Charging System Tester Read your code: OBD-II scanners →