Ignition Coil and Iridium Spark Plugs for Jaguar XF (2009-2010) 4.2L

Direct-Fit Ignition Coil and Iridium Spark Plug Service Kit for 2009-2010 Jaguar XF

What it Does: Restores factory secondary ignition voltage and precise spark timing across all eight cylinders to eliminate engine misfires, rough idling, and hesitation under load.

The Stock XF Secondary Ignition Degradation

The Jaguar 4.2L V8 packs tight packaging in the engine bay, subjecting factory coil-on-plug (COP) assemblies to intense thermal cycling and heat soak. Over time, OEM primary and secondary epoxy insulation breaks down, causing internal dielectric breakdown, micro-arcing, and intermittent misfires (P0300-P0308). Concurrently, standard spark plug electrodes erode, widening the gap, increasing the required firing voltage, and placing higher electrical stress on aging coil drivers.

The Engineering Solution

This comprehensive tune-up kit pairs eight reinforced ignition coils with fine-wire iridium spark plugs. The coil assemblies feature high-grade internal copper windings and high-dielectric epoxy potting to withstand continuous high underhood temperatures without voltage leakage. Direct-fit blade connectors ensure zero resistance at electrical contact points. Paired with laser-welded iridium spark plugs, the package delivers lower required ignition voltage, resistance to spark fouling, and stable flame kernel expansion under high cylinder pressures.

Technical Specifications

Compatibility

• 2009 Jaguar XF 4.2L V8 (Base, Luxury, Premium Luxury)
• 2010 Jaguar XF 4.2L V8 (Base, Luxury, Premium Luxury)

The Jaguar Precision Standard

Engineered to meet stringent European OBD-II diagnostics tolerances, these direct-replacement ignition components prevent false knock sensor triggers and maintain smooth, CEL-free operation under hard acceleration.