Ignition Coil and Iridium Spark Plugs for Toyota Highlander (2001-2007) 2.4L

High-Dielectric Ignition Coil and Iridium Spark Plug Kit for 2001-2007 Toyota Highlander

Direct-Fit Ignition Overhaul: Restores factory secondary ignition voltage and combustion efficiency across all four cylinders to eliminate misfires, rough idle, and hesitation under load.

The Stock Highlander 2AZ-FE Ignition Breakdown

Over extended thermal cycles, the factory coil-on-plug boots and epoxy insulation inside the deep spark plug wells of the 2AZ-FE engine experience severe dielectric breakdown. High engine bay operating temperatures degrade the internal secondary copper windings and cause micro-cracking in the phenolic resin casing. This thermal fatigue results in high-voltage arcing, carbon tracking along the plug insulator, increased coil resistance, and intermittent P0300-P0304 misfire codes, particularly during cold starts and sustained highway acceleration.

The Engineering Solution

This ignition service kit pairs four heavy-duty coil-on-plug assemblies featuring high-grade electrolytic copper windings with fine-wire iridium spark plugs. The coils utilize reinforced thermoplastic housings and high-temperature silicone boots to prevent electrical leakage and shield against thermal degradation. The fine-wire 0.6mm iridium center electrodes drastically reduce required firing voltage, maximize spark kernel development, and ensure complete fuel atomization while resisting gap erosion under continuous thermal stress.

Technical Specifications

Compatibility

• 2001-2007 Toyota Highlander Base 2.4L L4 (2AZ-FE) FWD / AWD
• OE & Interchange Reference: UF333, 90919-02244, 90919-02243, 90919-02266, 90080-19023, 9091902244

The Toyota Reliability Standard

Engineered to match precise OEM electrical dwell times and resistance parameters, this direct-replacement assembly prevents ECU fault triggers and delivers consistent ignition performance for long-term daily commuter reliability.