{"product_id":"ignition-coil-and-iridium-spark-plugs-for-jaguar-xf-2009-2010-4-2l","title":"Ignition Coil and Iridium Spark Plugs for Jaguar XF (2009-2010) 4.2L","description":"\u003ch2\u003eDirect-Fit Ignition Coil and Iridium Spark Plug Service Kit for 2009-2010 Jaguar XF\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e Restores factory secondary ignition voltage and precise spark timing across all eight cylinders to eliminate engine misfires, rough idling, and hesitation under load.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock XF Secondary Ignition Degradation\u003c\/h3\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis 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.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2009-2010 Jaguar XF\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eEngine \/ Chassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e4.2L AJ-V8 (AJ34) \/ X250\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eStock Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e300 hp \/ 310 lb-ft (Approx)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eUF519, UF533, 6R8312A366AA, C1678, LR016999, AJ83415, 5C1735\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2009 Jaguar XF 4.2L V8 (Base, Luxury, Premium Luxury)\u003c\/li\u003e\n  \u003cli\u003e2010 Jaguar XF 4.2L V8 (Base, Luxury, Premium Luxury)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Jaguar Precision Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered 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.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50448294314232,"sku":"DS-EP2WU39P6","price":120.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-coil-and-iridium-spark-plugs-for-jaguar-xf-2009-2010-4-2l-1.jpg?v=1788638806","url":"https:\/\/performancechiptuning.com\/fr\/products\/ignition-coil-and-iridium-spark-plugs-for-jaguar-xf-2009-2010-4-2l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}