Ignition Coil and Iridium Spark Plugs for Toyota Yaris (2004-2005) 1.3L

Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 2004-2005 Toyota Yaris

Primary Function: Restores factory secondary ignition output and combustion efficiency across all four cylinders to eliminate misfires, rough idle, and unburned fuel delivery.

The Stock Yaris Ignition Breakdown

Aging OEM coil-on-plug assemblies on the 1.3L 2NZ-FE engine endure severe thermal cycling deep inside the cylinder head plug wells. Over time, internal epoxy insulation degrades, causing micro-arcing and secondary winding breakdown. Combined with electrode erosion on aging plugs, the increased secondary circuit resistance stresses the coil packs, resulting in spark blowout under acceleration, sluggish throttle response, and diagnostic trouble codes P0300 through P0304.

The Engineering Solution

This comprehensive refresh kit includes four direct-fit coil packs and four premium iridium spark plugs. Built with high-purity copper windings and heavy-duty dielectric thermoplastic housings, the coils resist thermal breakdown and voltage leakage. Paired with laser-welded fine-wire iridium spark plugs that lower required firing voltages and ensure a precise, concentrated flame kernel, this system restores crisp combustion, smooth idle, and maximum fuel economy.

Technical Specifications

Compatibility

• 2004 Toyota Yaris 1.3L L4 (2NZ-FE Engine)
• 2005 Toyota Yaris 1.3L L4 (2NZ-FE Engine)

The Toyota Reliability Standard

Built to strict OEM dimensional and electrical specifications, this direct-fit ignition kit delivers reliable cold-start ignition, zero-CEL operation, and optimal engine balance for high-mileage daily reliability.