Ignition Coil and Iridium Spark Plugs for BMW 3 Series (2003-2011) 2.5L

Direct-Fit Ignition Coil & Iridium Spark Plug Kit for 2003-2011 BMW 3 Series

What it Does: Replaces degraded factory coil packs and worn plugs to eliminate multi-cylinder misfires, stabilize idle, and restore crisp combustion across the entire rev range.

The Stock 3 Series Ignition Breakdown

Positioned beneath tightly sealed engine acoustic covers, the factory ignition coils on BMW 2.5L inline-six engines suffer from extreme thermal soak. Continuous high-heat cycling degrades the internal potting epoxy and winding insulation, leading to secondary voltage breakdown, high-RPM misfires, and DME trouble codes (P0300–P0306). Additionally, standard spark plug electrodes erode over time, increasing the ignition gap and placing excessive electrical strain on the coils.

The Engineering Solution

This direct-replacement kit provides six high-output coil-on-plug assemblies and six fine-wire iridium spark plugs engineered to withstand aggressive combustion temperatures. Built with high-purity internal copper windings, durable dielectric resin, and corrosion-resistant blade terminals, the coils ensure maximum spark transfer without arcing. The matched iridium plugs offer superior thermal stability and require lower firing voltage, maintaining a precise spark gap for clean flame propagation and dependable throttle response.

Technical Specifications

Compatibility

• 2003-2006 BMW 325i / 325Ci / 325xi (E46) 2.5L Inline-6
• 2006-2011 BMW 323i / 325i (E90 / E91 / E92 / E93) 2.5L Inline-6

The BMW Precision Standard

Engineered to meet stringent European DME electrical tolerances, this complete ignition overhaul kit provides seamless plug-and-play installation, direct factory terminal mating, and zero check-engine lights.