Mazda Atenza Rear Oxygen Sensor PE12-18-86Z OE Spec Oxygen Sensor

When your Mazda Atenza (Mazda6) shows check engine light, rough idle, abnormally high fuel consumption, or poor acceleration, it is likely due to aging rear oxygen sensor. This sensor continuously feeds the ECU with exhaust oxygen concentration data to precisely control the air–fuel ratio and ensure combustion efficiency and emission standards. OEM number PE12-18-86Z; fits all Mazda Atenza models. Use a dedicated socket for removal to avoid thread damage, and ensure the sensor harness does not contact the exhaust pipe to prevent high-temperature melting.