Subaru OEM Rear Oxygen Sensor Subaru WRX STi 2002-2007 | 22690AA520

This OEM rear oxygen sensor is specifically designed for Subaru STi from 2004 - 2007 and Subaru WRX from 2002 - 2007. It plays a crucial role in your vehicle's performance by sensing the oxygen concentration in the exhaust gas. This helps determine whether the air - fuel ratio is leaner or richer than the ideal stoichiometric ratio. The sensor features a zirconia tube that generates voltage based on oxygen ion concentration differences. With platinum coating on the tube for catalysis and as an electrode material, and a grounded housing connected to the ECM via a harness. A ceramic heater enhances its low - temperature performance. When the engine burns fuel, the sensor's electromotive force changes according to the air - fuel mixture, allowing the ECM to easily determine the mixture ratio. It reaches stable output at around 300 - 400 °C (572 - 752 °F). Note that Subaru of America only warranties parts installed by a certified Subaru dealership, and the part must match the vehicle VIN.

Using this rear oxygen sensor is straightforward. It's made to fit perfectly in your 2002 - 2007 Subaru WRX or 2004 - 2007 Subaru STi. Just install it in the designated place as per your vehicle's manual. When it comes to maintenance, keep an eye on the sensor's temperature. It works best at around 300 - 400 °C (572 - 752 °F). Avoid any physical damage to the sensor and its harness. Also, remember that for warranty, you must have it installed by a certified Subaru dealership and the part has to match your vehicle's VIN. If you notice any issues with your vehicle's performance, it might be a sign that the sensor needs checking.