Subaru OEM Rear Oxygen Sensor Subaru STi 2008-2021 | 22690AA850 vendor_3D MAXpider Part #: TR-FPU1005F

Part #: TR-FPU1005F

The Khanacooler is engineered as a true straight-fit upgrade

6mm 304 Stainless Construction

Part #: ACR-1837

Part #: FG0809SBIMP4D-STI

Subaru OEM Rear Oxygen Sensor Subaru STi 2008-2021 | 22690AA850 vendor_3D MAXpider Part #: TR-FPU1005FFor your: Subaru STi 2008 2021 Rear O2 Sensor The rear oxygen sensor is used to sense oxygen concentration in the exhaust gas. If the air fuel ratio is leaner than the stoichiometric ratio in the mixture (i. e., excessive amount of air), the exhaust gas contains more oxygen. To the contrary, if the fuel ratio is richer than the stoichiometric ratio, the exhaust gas contains almost no oxygen. Detecting the oxygen concentration in exhaust gas using the