Buick GL8 Rear Oxygen Sensor 9024603 Original Replacement

Buick Envision owners experiencing high fuel consumption, rough idle, or emissions out of spec, with the “Check Engine” light on, typically indicates aging or failure of the downstream oxygen sensor. This sensor monitors residual oxygen in the exhaust and sends real-time signals to the ECU to precisely adjust the air-fuel ratio, maintaining optimum combustion efficiency. This product is a replacement under original factory specifications with OEM number 9024603 for rear oxygen sensor, suitable for older vehicles. Replacement helps restore power performance. If acceleration is weak, fault lights illuminate, or exhaust has a sharp odor, the oxygen sensor has aged or failed and should be replaced to prevent further damage to the catalytic converter.