别克昂科拉 2013款 后氧传感器 55568266 0258010109

Buick Encore/2013 rear oxygen sensor (55568266 / 0258010109) is specifically matched to this model year, installed behind the catalytic converter. It transmits oxygen signals to the engine control module to help maintain the optimal air-fuel ratio and monitor catalytic converter operation. When replacing, pay attention to sensor wiring route to avoid contact with the exhaust pipe causing heat damage. If the vehicle experiences acceleration hesitation, rough idle, or emissions test failure, rear oxygen sensor aging or lead poisoning is often the cause; replacement is essential for fuel economy and emissions.