Ignition Coil & Iridium Spark Plugs for Jaguar XKR-S (2012) 5.0L V8

High-Output Ignition Coil & Iridium Spark Plug Kit for Jaguar XF

This direct replacement ignition coil and iridium spark plug package restores optimal ignition efficiency and prevents misfires under high-load operating conditions.

The Stock AJ133 Ignition Shortcomings

The factory ignition coils on the Jaguar 5.0L V8 (AJ133) are notoriously susceptible to thermal degradation due to their placement within the tight confines of the XF engine bay. Constant heat cycling breaks down the internal epoxy potting and primary windings, leading to increased electrical resistance. As the factory spark plug gap naturally widens over time, the degraded coils struggle to bridge the gap. This results in weak spark delivery, rough idle conditions, cylinder misfires under load, and unburnt fuel entering the exhaust tract—a condition that can prematurely degrade expensive catalytic converters.

The Engineering Solution

This upgraded package resolves OE ignition failure points by pairing 100% factory-tested, high-performance ignition coils with precision-gapped iridium spark plugs. The new coils feature upgraded, durable copper wire primary and secondary windings encased in high-dielectric epoxy resin, ensuring consistent voltage output and superior resistance to engine heat soak. The included iridium spark plugs provide a highly concentrated spark kernel, minimizing the required firing voltage while offering exceptional wear resistance. This combination yields an estimated 15% improvement in spark energy transfer, eliminating spark blowout under heavy throttle and restoring optimal combustion efficiency for smooth, reliable power delivery.

Technical Specifications

Compatibility

• Jaguar XF 5.0L V8
• Jaguar XKR-S (2012) 5.0L V8

The Jaguar Precision Standard

Designed to meet the stringent tolerances of European engine management systems, these ignition components guarantee a clean installation with zero check engine lights (CEL). Maintaining proper spark duration ensures the AJ133 continues to deliver the refined yet aggressive power expected from a properly tuned Jaguar.