Chevrolet Buick GMC Rear Oxygen Sensor 12643903 234-8085 Direct Replacement

Chevrolet Malibu, Cadillac ATS, Buick Regal and other models use rear oxygen sensor (OEM 12643903, compatible with 234-4762, 12643708, etc.); built with heat-resistant ceramic substrate and precise electrode process, with strong resistance to thermal shock and long-term stability; tested lifespan comparable to OE standards. This sensor monitors exhaust oxygen content and feeds ECU to adjust air-fuel ratio; direct replacement for OEM, ensuring combustion efficiency and emissions compliance.