Ignition Coil and Iridium Spark Plugs for Mercedes Benz C-Class (2015-2018) 2.0L

Direct-Fit Ignition Service Kit for 2015-2018 Mercedes Benz C-Class

What it Does: Restores factory spark energy and precise combustion timing across all four cylinders to eliminate misfires, rough idling, and hesitation under boost.

The Stock C-Class Ignition Vulnerability

The turbocharged M274 engine operates under elevated cylinder pressures and thermal loads. Over time, OEM ignition coils suffer dielectric breakdown within the primary and secondary internal copper windings due to sustained engine bay heat soak. Simultaneously, factory spark plug electrodes degrade, widening the plug gap and forcing the coil packs to demand higher secondary voltage. This thermal and electrical fatigue leads to erratic spark delivery, unburnt fuel entering the exhaust tract, hesitation during wide-open throttle transitions, and common diagnostic trouble codes such as P0300 through P0304.

The Engineering Solution

This comprehensive service kit pairs four heavy-duty coil-on-plug units with four fine-wire iridium spark plugs engineered to factory thermal specs. The ignition coils feature premium insulated copper windings and high-grade silicone boots to prevent electrical arcing and dielectric failure under high load. The iridium plugs offer superior thermal conductivity and corrosion resistance compared to standard nickel, maintaining a precise spark gap under high boost levels to deliver consistent flame kernel propagation and smooth power delivery.

Technical Specifications

Compatibility

• 2015 Mercedes-Benz C300 2.0L L4 (W205)
• 2016 Mercedes-Benz C300 2.0L L4 (W205)
• 2017 Mercedes-Benz C300 2.0L L4 (W205)
• 2018 Mercedes-Benz C300 2.0L L4 (W205)

The Mercedes-Benz Precision Standard

European direct-injection engines require exact resistance and dwell-time calibration to prevent false misfire flags. These coils and iridium plugs match factory ECU parameters for plug-and-play installation without triggering check engine lights.