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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.
Oxygen Sensors. O2, or oxygen sensors, measure the amount of oxygen that was not burned by the engine and therefore escapes through the exhaust. These sensors then send a signal that allows a computer to make the adjustments that are necessary to keep emissions at an ideal level.