Chevrolet/Buick/GMC Oxygen Sensor 234-4673 front/rear dual-use for precise air-fuel ratio adjustment

When your vehicle experiences idle instability, weak acceleration, abnormal fuel consumption increase, or check engine light on with misfire, it is likely the O2 sensor aging or failure—it cannot accurately monitor exhaust oxygen content, causing air–fuel ratio drift. Proper operation sees the sensor feedback fuel data to ECU to precisely adjust injection, ensuring efficient combustion and reduced emissions. Fits Chevrolet, Buick, GMC models with OEM numbers 12607145, 12617648, 12646200, 12639693, 12572707. Before installation confirm sensor location (front/rear universal) and use dedicated socket to avoid thread damage; apply anti-seize compound and tighten to 20-30 Nm to prevent leaks or loosening.