2021 Mercedes-Benz C300 Service and Repair Manual

This factory service and repair manual for the 2021 Mercedes-Benz C300 lists three bodies, the convertible, the sedan and the coupe, offered as Base or 4Matic. A single engine serves them: a 2.0L inline-four, gasoline-fueled, turbocharged and built with double overhead camshafts. The manual pairs engine specifications and torque values with body procedures and wiring diagrams for the convertible, coupe and sedan.

Engines covered

• 2.0L inline-four — DOHC, turbocharged, gasoline

Body styles covered

• 2-door convertible
• 4-door sedan
• 2-door coupe

Trims covered

• Base
• 4Matic

Known issues on the 2021 C300. The 2021 C300 has seven recalls on the federal record. Certain convertible versions may have rear headrests mounted wrongly to the seatbacks, so they could shift or come off in a crash. On certain vehicles a bad contact in the seat position switch could stop the front air bags and belt force limiters from working as designed, and certain cars could suffer a fuel pump shutdown that cuts drive power, which dealers remedy with a new pump. Owners submitted 15 complaints, 8 of them about the engine and 2 each about air bags and the power train. Seat and restraint procedures, fuel pump service and wiring diagrams are covered.