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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.
Lambda Sensor. The Lambda Sensor, also known as an Oxygen or O 2 sensor, gives a voltage feedback to the ECU indicating the amount of oxygen in the exhaust stream, thus allowing accurate control over the combustion mixture.ambda Sensor. The Lambda Sensor, also known as an Oxygen or O 2 sensor, gives a voltage feedback to the ECU indicating the amount of oxygen in the exhaust stream, thus allowing accurate control over the combustion mixture.