Oxygen Sensor

This unit is positioned in the exhaust pipe so it can sense exhaust gas composition as it comes from the engine. The sensor detects oxygen content in order to relay a signal to the Electronic Control Module. A special construction allows this sensor to react to oxygen levels by generating a voltage signal which is inversely proportionate to the amount of oxygen. If the oxygen content of the exhaust gas is high, the voltage signal created by the sensor is low. If the oxygen content is low (indicating a rich mixture), the voltage signal to the ECM is high.

To ensure proper functioning of the oxygen sensor, it must be replaced at regular intervals. On all models, replacement is required every 30, 000 miles. A warning "flag" in the speedometer face will be activated at the appropriate time.