Ignition Coil and Iridium Spark Plugs for Mercedes Benz C-Class (2003-2005) 1.8L

Direct-Fit Ignition Tune-Up Kit for 2003-2005 Mercedes Benz C-Class

Primary Function: Restores factory secondary ignition performance and peak combustion efficiency for the 1.8L supercharged M271 powertrain by replacing degraded coils and worn electrodes with matched high-dielectric coil-on-plug packs and fine-wire iridium plugs.

The Stock W203 Ignition Breakdown

The forced-induction M271 engine operates under elevated cylinder pressures and thermal loads within the tight engine bay of the W203 chassis. Over time, OEM ignition coils suffer from dielectric breakdown in the epoxy potting, internal copper winding fatigue, and boot micro-cracking. This breakdown causes high-rpm spark blowout, secondary voltage leakage, rough idle, and persistent misfire codes (P0300–P0304). Simultaneously, worn standard spark plug gaps increase the required firing voltage, accelerating coil driver degradation inside the ECU.

The Engineering Solution

This complete 4-cylinder refresh kit features four heavy-duty coil packs engineered with high-conductivity copper primary and secondary windings, reinforced PBT thermoplastic housings, and heat-resistant silicone boots to isolate high voltage. Paired with four fine-wire iridium spark plugs, the system requires significantly lower ionization voltage while providing a stable, localized spark kernel capable of withstanding boost pressure. The result is instant throttle response, optimized fuel burn, and total elimination of high-load ignition misfires.

Technical Specifications

Compatibility

• 2003-2005 Mercedes-Benz C230 Kompressor Sedan 1.8L L4
• 2003-2005 Mercedes-Benz C230 Kompressor Coupe 1.8L L4

The Mercedes-Benz Calibration Standard

Engineered to meet precise European engine management tolerances, these direct-fit blade terminal assemblies deliver OEM-specified dwell time response without triggering nuisance check engine lights or interference with sensitive CAN bus electronics.