Ignition Coil and Iridium Spark Plugs for Mercedes-Benz C230 (2003-2005) 1.8L

Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 2003-2005 Mercedes-Benz C230

What it Does: The Ignition Coil and Iridium Spark Plug Kit restores complete secondary ignition efficiency on the 2003-2005 Mercedes-Benz C230 to eliminate cylinder misfires, rough idle, and spark blowout under boost.

The Stock Mercedes-Benz C230 Secondary Ignition Degradation

The forced-induction M271 engine in the W203 chassis generates elevated cylinder head temperatures that accelerate dielectric breakdown in factory pencil coils. Over sustained heat cycles, the internal epoxy potting cracks, allowing high-voltage arcing to bridge through the silicone boots directly into the spark plug wells. Concurrently, factory standard nickel or aged plugs experience rapid ground electrode erosion under boost pressure, widening the spark gap past acceptable tolerances. This combination triggers unmetered misfires under heavy throttle load, catalytic converter damage from raw fuel wash, and persistent P0300 through P0304 diagnostic trouble codes.

The Engineering Solution

This comprehensive tune-up kit restores high-voltage stability by pairing direct-fit coil-on-plug pencil coils with ultra-fine wire iridium spark plugs. Each ignition coil features high-density copper primary and secondary windings encased in void-free epoxy resin, guaranteeing maximum dielectric insulation and resistance to thermal shock. The accompanying spark plugs utilize laser-welded iridium center electrodes engineered to handle the thermal demands of the supercharged M271 without gap expansion. By lowering required firing voltage and delivering sustained arc duration, this kit guarantees clean flame-front propagation, crisper throttle response, and complete fuel combustion across all engine RPM bands.

Technical Specifications

Compatibility

• 2003 Mercedes-Benz C230 Kompressor Sedan / Coupe 1.8L L4 (M271)
• 2004 Mercedes-Benz C230 Kompressor Sedan / Coupe 1.8L L4 (M271)
• 2005 Mercedes-Benz C230 Kompressor Sedan / Coupe 1.8L L4 (M271)

Frequently Asked Questions

Does this fit the W203 C230?
Yes, this is a direct fit for the 2003-2005 Mercedes-Benz C230 equipped with the 1.8L supercharged M271 engine.

Are these spark plugs pre-gapped for forced induction?
Yes, the iridium plugs are precision set to factory gap specifications, but always inspect the electrode clearance prior to torquing.

The Mercedes-Benz Precision Standard

Engineered to meet stringent European OBD-II parameters, this ignition kit maintains factory primary circuit resistance to ensure seamless operation without triggering check engine lights or interference with the sensitive Mercedes-Benz Bosch ME engine management system.