Subaru OEM Rear Oxygen Sensor Subaru STi 2008-2021 | 22690AA850 vendor_3D MAXpider Part #: ACR-1837

Part #: ACR-1837

Part #: RRS0607SBIMP-CH

HKS Turbo Exhaust Manifold for the Subaru WRX and STi is an OEM replacement (using the standard 2 bolt uppipe connection) which comes with gaskets and a heat shield blanket

and to remove you simply lower the window and angle the vent downwards and out

Subaru OEM Rear Oxygen Sensor Subaru STi 2008-2021 | 22690AA850 vendor_3D MAXpider Part #: ACR-1837For 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