Ignition Coil & Iridium Spark Plugs for Audi A8 Quattro (2007-2014) 4.0L 4.2L V8

High-Output Ignition Coil & Iridium Spark Plug Kit for 2007-2014 Audi A8

What it does: Replaces failing factory coils and plugs with upgraded copper-wound packs and iridium electrodes to restore proper combustion, eliminate misfires, and improve spark energy by up to 15%.

The Stock A8 Thermal Degradation Weakness

The factory ignition coils on the D3 and D4 chassis A8—particularly the 4.2L FSI and 4.0L TFSI powerplants—are highly susceptible to thermal degradation over time. Wedged deep within the engine valley and subjected to extreme heat cycles, the OEM epoxy and thin internal windings inevitably break down. This insulation failure leads to internal shorting, weak spark delivery, and severe cylinder misfires under load. Furthermore, aging OEM spark plugs experience gap expansion and electrode wear, increasing the resistance the coils must overcome, which accelerates ignition system failure and triggers persistent P0300-series trouble codes.

The Engineering Solution

This comprehensive ignition refresh kit resolves these inherent design flaws by pairing high-output coils with premium Iridium spark plugs. The upgraded ignition coils feature superior-grade copper wire windings and reinforced dielectric epoxy housings, ensuring consistent voltage output and resistance to heat soak even during aggressive driving. The included Iridium spark plugs offer a significantly higher melting point than standard copper or platinum plugs, providing a fine-wire center electrode that requires less voltage to bridge the gap. Together, this OE+ replacement package delivers up to a 15% increase in spark energy, promoting a more complete burn, smoothing out the idle, and restoring factory throttle response without the risk of premature degradation.

Technical Specifications

Compatibility

• 2007-2014 Audi A8 Quattro (4.2L V8)
• 2013-2014 Audi A8 Quattro (4.0L V8)

The Audi Precision Standard

Engineered for the stringent parameters of modern European electronics, this kit ensures precise fitment, reliable starts, and zero dashboard CELs, maintaining the exact combustion timing required for high-compression V8 applications.