Mazda Ruii 2.5L Front Oxygen Sensor L509-18-8G1L1 Plug and Play

Mazda Atenza (Mazda 6) 2.5L idle instability, noticeably higher fuel consumption, check engine light, or reduced power on acceleration, usually indicates front oxygen sensor aged or failed and unable to monitor air-fuel ratio accurately. This sensor normally detects oxygen content in exhaust and feeds ECU to adjust fueling to meet combustion and emissions standards. This product with OEM number L509-18-8G1L1 fits Mazda Atenza 2.5L; install only with cold engine to avoid burns. After removing old sensor, clean carbon from threads and apply a small amount of anti-seize; torque to standard; plug-in interface should be firm.