Ignition Coil and Iridium Spark Plugs for Lexus RC300 (2018-2020) 2.0L

Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 2018-2020 Lexus RC300

What it Does: The ignition coil and iridium spark plug kit replaces fatigued factory ignition components on the 2018-2020 Lexus RC300 2.0L Turbo to eliminate high-boost misfires and restore sharp throttle response.

The Stock Lexus RC300 Dielectric Breakdown and Gap Erosion

In the turbocharged ASC10 chassis, high engine bay temperatures and continuous boost cycles place extreme thermal stress on the ignition system. Over time, the factory 8AR-FTS ignition coil packs experience internal epoxy cracking and secondary winding insulation fatigue, which allows high-voltage leakage and carbon tracking. Concurrently, factory spark plug ground electrodes erode, steadily widening the spark gap. Under wide-open throttle, high cylinder pressures quench the weakened spark, leading to ignition blowout, rough idling, hesitation under load, and DTC misfire codes (P0300–P0304).

The Engineering Solution

This comprehensive service kit replaces degraded components with four heavy-duty direct-fit pencil coils and four matched fine-wire iridium spark plugs. The ignition coils are engineered with high-dielectric epoxy and low-resistance copper windings to meet and exceed OEM specifications for 90919-02269 and UF916, preventing thermal degradation and current leakage. Paired with ultra-fine iridium center electrodes and platinum-tipped ground electrodes, this kit reduces the required firing voltage, provides superior quench resistance, and stabilizes ignition timing under peak boost levels.

Technical Specifications

Compatibility

• 2018 Lexus RC300 Base 2.0L Turbo RWD (Chassis: ASC10)
• 2018 Lexus RC300 F Sport 2.0L Turbo RWD (Chassis: ASC10)
• 2019 Lexus RC300 Base 2.0L Turbo RWD (Chassis: ASC10)
• 2019 Lexus RC300 F Sport 2.0L Turbo RWD (Chassis: ASC10)
• 2020 Lexus RC300 Base 2.0L Turbo RWD (Chassis: ASC10)
• 2020 Lexus RC300 F Sport 2.0L Turbo RWD (Chassis: ASC10)

Frequently Asked Questions

Does this fit the ASC10 RC300?
Yes, this is a direct fit for the 2018-2020 Lexus RC300 equipped with the 8AR-FTS 2.0L turbo engine.

Do these iridium spark plugs require pre-gapping prior to installation?
The spark plugs are preset for factory 8AR-FTS clearances, but gentle verification with a feeler gauge is recommended before torquing.

The Lexus Precision Standard

Maintaining the sports-coupe dynamics of the ASC10 platform requires uncompromising combustion precision. Renewing both ignition coils and plugs at the same service interval guarantees consistent flame core development, clean high-RPM pull, and zero check-engine lights.