Ignition Coil and Iridium Spark Plugs for Mercedes Benz C-Class (2012-2015) 1.8L

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

What it Does: Restores factory secondary ignition output and precise combustion timing by replacing degraded coil packs and worn spark plugs across all four cylinders.

The Stock C-Class Ignition Degradation

The turbocharged direct-injected M271 engine generates elevated underhood temperatures and high cylinder pressures that rapidly deteriorate factory coil boots and primary/secondary windings. Over time, thermal cycling causes internal dielectric breakdown, micro-arcing, and carbon tracking. Paired with eroded factory spark plug electrode gaps, this deterioration leads to high-rpm misfires, rough idle harmonics, sluggish boost response, and intermittent P0300-P0304 fault codes.

The Engineering Solution

This comprehensive ignition service kit features four high-dielectric coil-on-plug assemblies engineered with high-conductivity internal copper windings and thermoplastic housings resistant to thermal breakdown. Direct-fit OE blade terminals ensure zero harness resistance. Paired with four fine-wire iridium spark plugs (ILFR6B / 6481), the assembly provides superior spark kernel propagation, consistent flame front expansion, and reliable direct-injection ignition under high boost loads.

Technical Specifications

Compatibility

• 2012-2015 Mercedes-Benz C250 Base Sedan / Coupe (1.8L L4 Turbo M271)
• 2012-2014 Mercedes-Benz C250 Luxury Sedan (1.8L L4 Turbo M271)
• 2012-2015 Mercedes-Benz C250 Sport Sedan / Coupe (1.8L L4 Turbo M271)

The Mercedes-Benz Precision Standard

Engineered to meet strict European electrical specifications, this ignition kit delivers OE-matched dwell times and primary resistance values to prevent ECU fault triggers, maintain closed-loop fuel trims, and eliminate check engine lights.