Ignition Coil and Iridium Spark Plugs for Nissan Altima (2002-2006) 2.5L

Direct-Replacement Ignition Kit for 2002-2006 Nissan Altima

What it Does: Restores factory secondary ignition output and combustion efficiency across all four cylinders to eliminate misfires, rough idle, and unburnt fuel waste.

The Stock Altima Thermal Breakdown Weakness

The QR25DE cylinder head subjects factory coil-on-plug modules to extreme thermal cycles, causing internal epoxy degradation, micro-cracking in the secondary insulation, and dielectric breakdown. Over time, high resistance in worn copper windings causes spark degradation, while eroded stock spark plug electrodes widen gaps, overstressing the coils and triggering P0300-P0304 fault codes under load.

The Engineering Solution

This complete tune-up kit pairs four high-dielectric coil packs with four laser-welded iridium spark plugs. The ignition coils feature premium internal copper windings and reinforced thermoplastic housings resistant to thermal fatigue and oil contamination. Matched with fine-wire iridium center electrodes, the system lowers required ignition voltage, prevents carbon tracking, and ensures a stable, high-energy spark kernel under high cylinder pressures.

Technical Specifications

Compatibility

• 2002 Nissan Altima 2.5L 4-Cylinder (Base, S, SL)
• 2003 Nissan Altima 2.5L 4-Cylinder (Base, S, SL)
• 2004 Nissan Altima 2.5L 4-Cylinder (Base, S, SL)
• 2005 Nissan Altima 2.5L 4-Cylinder (Base, S, SL)
• 2006 Nissan Altima 2.5L 4-Cylinder (Base, S, SL)

The Nissan Precision Calibration Standard

Engineered to match OEM electrical impedance and dwell time parameters, this ignition setup ensures seamless ECU integration without check-engine lights or harness modifications, restoring throttle response and baseline torque.