Ignition Coil and Iridium Spark Plugs for Scion xB (2004-2006) 1.5L

Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 2004-2006 Scion xB

What it Does: Complete 4-cylinder ignition service kit engineered to eliminate secondary ignition breakdown and restore precise combustion timing on high-mileage 1NZ-FE engines.

The Stock xB Dielectric Breakdown Problem

Factory coil packs on the aging NCP31 chassis degrade under prolonged engine bay thermal cycling. Heat-hardened epoxy housings and aged silicone boots develop micro-fissures, leading to dielectric breakdown, high-voltage flashover, intermittent misfires under load, and carbon tracking along the spark plug insulators.

The Engineering Solution

This service kit features four direct-replacement coil-on-plug assemblies manufactured with heavy-duty internal copper primary and secondary windings, paired with four fine-wire iridium spark plugs. High-grade thermoplastic housings resist thermal deformation, while high-dielectric silicone boots isolate secondary voltage up to factory peak limits. The high-melting-point iridium center electrodes resist spark erosion, maintaining optimal gap tolerance and low arc voltage demand across the entire powerband.

Technical Specifications

Compatibility

• 2004 Scion xB Base 1.5L L4 Gas (1NZ-FE)
• 2005 Scion xB Base 1.5L L4 Gas (1NZ-FE)
• 2006 Scion xB Base 1.5L L4 Gas (1NZ-FE)
• 2004-2006 Scion xB Release Series (1.0, 2.0, 3.0) 1.5L L4 Gas

The Scion Reliability Standard

Engineered for high-mileage JDM 1NZ-FE platforms, this kit maintains clean idle stability, prevents unburnt fuel fouling of the catalytic converter, and guarantees immediate cold-start ignition.