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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.
Auto Repair forum. oxygen sensor function, upstream and downstream. I have a 1997 Jeep GC Ltd 4WD 4.0L that has two oxygen sensors, one upstream and one downstream. It's setting a code 51 that my Haynes manual explains in two related, but significantly (I think) different ways. Explanation 1: Oxygen sensor signal input indicates lean fuel/air ratio condition during engine operation.