Iridium Tough Spark Plug

The Subaru 22401AA801 spark plug is an Iridium Tough ignition component designed to deliver optimal combustion performance, fuel efficiency, and engine responsiveness. This genuine OEM part features a resistor for proper function and a 3-earthed electrode design for enhanced durability and ignition stability. With a thread length of 26.5mm, it is engineered to replace the 22401AA800 part number. This spark plug is specifically designed for the Subaru BRZ and Scion FR-S models, generally fitting from 2013 through 2026, and is also referenced for the Toyota 86. While part numbers are typically reliable, it is always recommended to confirm fitment with your vehicle's VIN before purchase, especially if your vehicle has been modified. The part is sold individually, and replacement typically involves changing all spark plugs in the engine. As an iridium-tipped spark plug, it is crucial to use only this type of plug. Do not adjust the gap when tuning the engine, as iridium plugs are precision-manufactured to exact specifications. Proper installation and adherence to these guidelines will ensure optimal performance and longevity of your engine's ignition system.