Ignition Coil and Iridium Spark Plugs for Mercedes Benz C-Class (2012-2015) 3.5L

Direct-Fit Ignition Coil and Iridium Spark Plug Service Kit for 2012-2015 Mercedes Benz C-Class

Direct-fit replacement ignition tune-up kit: Restores factory spark energy and cylinder combustion efficiency across all six cylinders on the M276 direct-injected 3.5L V6 engine.

The Stock C-Class Ignition Coil Thermal Degradation

Under repeated thermal cycling within the compact W204 engine bay, factory ignition coils suffer dielectric epoxy degradation and secondary winding resistance breakdown. Combined with the high cylinder pressures of direct injection, failing coils cause partial combustion, intermittent misfires under acceleration, and rough idling. Concurrently, factory spark plug electrode erosion widens the gap, placing excessive electrical load onto aging coil drivers.

The Engineering Solution

This complete 6-cylinder ignition kit pairs high-grade coil-on-plug assemblies with laser-welded iridium spark plugs. Each coil utilizes high-conductivity copper primary and secondary windings potted in heat-resistant epoxy to prevent voltage leakage and thermal breakdown. OE-spec blade terminals and molded connectors ensure precise dwell control, while the fine-wire iridium spark plugs provide reliable arc stability, anti-fouling durability, and maximum flame kernel propagation.

Technical Specifications

Compatibility

• 2012-2014 Mercedes-Benz C350 Base Sedan 3.5L V6 (W204)
• 2012-2014 Mercedes-Benz C350 4Matic Sedan 3.5L V6 (W204)
• 2012-2015 Mercedes-Benz C350 Base Coupe 3.5L V6 (C204)
• 2012-2015 Mercedes-Benz C350 4Matic Coupe 3.5L V6 (C204)

The Mercedes Benz Precision Standard

Manufactured to satisfy strict European direct-injection requirements, this ignition service kit delivers balanced primary-to-secondary voltage transfer, restoring crisp throttle response, clean combustion cycles, and zero misfire-induced check engine lights.