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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.
It informs the driver the amount of oxygen present in the exhaust mixture and sends the data to the vehicle computer. Basically, the presence of oxygen in the process of combustion is necessary in order for the fuel to get burned. Thus the use of oxygen sensors is very much valuable for the purpose of monitoring. An oxygen sensor is positioned in the exhaust pipe.