Ignition Coil and Iridium Spark Plugs for Volvo S40 (2004-2010) 2.4L

OEM-Grade Direct-Replacement Ignition Kit for 2004-2010 Volvo S40

Complete 5-cylinder ignition overhaul: Restores factory spark energy, stabilizes idle harmonics, and eliminates secondary-ignition misfires on naturally aspirated 2.4L inline-5 Volvo powerplants.

The Stock S40 Secondary Ignition Breakdown

The compact engine bay of the Volvo P1 platform subjects the cylinder head and spark plug wells to intense thermal cycling. Over time, OEM coil-on-plug assemblies suffer dielectric breakdown within the internal epoxy potting, causing secondary voltage leakages and internal winding degradation. Paired with eroded factory spark plug gap clearances, this increased electrical resistance leads to hesitations under load, rough cold starts, reduced fuel economy, and persistent P0300 through P0305 cylinder misfire fault codes.

The Engineering Solution

This comprehensive ignition kit features five reinforced coil-on-plug assemblies built with high-conductivity internal copper windings and high-dielectric thermoplastic housings to isolate voltage spikes. Paired with five fine-wire iridium spark plugs, the setup minimizes required ignition voltage while maximizing flame kernel expansion. Precision-engineered blade terminals and OEM-spec electrical connectors ensure seamless plug-and-play installation, providing durable combustion stability and superior heat dissipation under demanding operating temperatures.

Technical Specifications

Compatibility

• 2004-2010 Volvo S40 2.4 / 2.4i (2.4L Inline-5 Naturally Aspirated)

The Volvo Precision Standard

Engineered to match strict European engine management parameters, this kit maintains factory electrical resistance curves to prevent false CEL triggers, ensuring smooth transient throttle response and pristine emissions compliance.