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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.
On the front oxygen sensor, you'll need to get a little creative. The front sensor is mounted in a really tight space and at a odd angle. To loosen it, you'll need to use a special type of crow's-foot wrench with a slit cut in the side to remove it. The electrical plug for both O2 sensors unplug from the chassis plug.