Compatibility: The Toyota 90919-02239 Ignition Coil Assembly is compatible with various Toyota models, including the Toyota Corolla, Celica, MR2 Spyder, and Matrix, among others1. It’s essential for smooth engine performance and reliable ignition.Function: The ignition coil assembly is responsible for converting the low-voltage electrical current from your car’s battery into a high-voltage spark. This spark is then delivered to the spark plugs, igniting the air-fuel mixture in the engine cylinders.