Ignition Coil and Iridium Spark Plugs for Audi A4 (2003-2005) 3.0L

Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 2003-2005 Audi A4

What it Does: Restores direct primary-to-secondary ignition voltage and stabilizes combustion efficiency across all six cylinders to eliminate misfires and rough idling.

The Stock A4 B6 Ignition Breakdown

The Audi 3.0L 30-valve AVK V6 platform subjects coil-on-plug packs to intense thermal soak deep within the cylinder head valve covers. Over time, factory coil insulation degrades, causing primary and secondary copper windings to experience high-voltage arc-through. This breakdown leads to intermittent cylinder misfires, hesitation under load, poor fuel atomization, and flashing check engine lights that threaten catalytic converter longevity.

The Engineering Solution

This 6-cylinder refresh kit features reinforced coil-on-plug assemblies manufactured with high-grade copper primary windings and heavy-duty dielectric epoxy potting to withstand continuous thermal cycling. Paired with fine-wire iridium core spark plugs, the system lowers required ionization voltage, promotes stable flame kernel propagation, and maintains exact electrode gap integrity under sustained high-RPM operation.

Technical Specifications

Compatibility

• 2003 Audi A4 3.0L V6 (Sedan, Avant, Cabriolet)
• 2004 Audi A4 3.0L V6 (Sedan, Avant, Cabriolet)
• 2005 Audi A4 3.0L V6 (Sedan, Avant, Cabriolet)
• 2003-2005 Audi A4 Quattro 3.0L V6 (All Trims)

The Audi Precision Standard

Engineered to exact German OE electrical tolerances, this ignition service kit guarantees precise spark timing, smooth idle recovery, and zero diagnostic trouble codes across factory Motronic engine management systems.