Brilliance Junjie Oxygen Sensor 25327386 Front and Rear Replacement Set

Zhonghua Junjie oxygen sensor (25327386) installed before and after the catalytic converter on the exhaust pipe, used for real-time monitoring of exhaust oxygen content and feeding back to the ECU to adjust air-fuel ratio, ensuring combustion efficiency. Compatible with Junjie all-series models; both upstream and downstream positions are interchangeable; installation difficulty medium; estimated labor 30-45 minutes; take care to avoid thread damage during removal. If the vehicle idles poorly, fuel consumption rises noticeably, accelerates weakly or the fault light stays on, oxygen sensor aging is indicated; replacement recommended to restore performance.