Nissan Cefiro A33 2004 2.0L Front Right Oxygen Sensor 22690-2Y921/22691-3Y101

Nissan Teana Luzhene A33 front-right oxygen sensor, OEM number 22690-2Y921 (also compatible with 22691-3Y101), installed on the exhaust pipe close to the catalytic converter. It live-monitors oxygen content in exhaust and feeds back to the ECU to finely adjust the air-fuel ratio, ensuring combustion efficiency and emissions compliance. If the engine fault light is on, idle is unstable, fuel consumption rises or acceleration is weak, the sensor needs replacement. Installation difficulty medium; recommended labor about 0.5-1 hour; protect threads to avoid damage.