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The rear oxygen sensor is located in the front section of the rear catalytic converter. On the 2.2L engine the front (A/F) oxygen sensor is located in the front section of the front catalytic converter. The rear oxygen sensor is located in the rear section of the rear catalytic converter.
How to Repair & Clean Oxygen Sensors. Oxygen sensors are small devices on your car or truck that measure and balance the oxygen to fuel ratio. Part of the emissions control system, the sensor feeds information to your car's power control module, which is your car's computer brain.