O2 Sensor: Description

The upstream oxygen sensor threads into the outlet flange of the exhaust manifold. See Fig 1 and Fig 2.

Fig 1: O2 Sensor Upstream 1/1 - 2.4L

Courtesy of DAIMLERCHRYSLER CORP.

Fig 2: O2 Sensor Upstream 1/1 - 3.3/3.8L

Courtesy of DAIMLERCHRYSLER CORP.

The downstream heated oxygen sensor threads into the outlet pipe at the rear of the catalytic convertor. See Fig 3.

Fig 3: O2 Sensor Downstream 1/2 - 2.4/3.3/3.8L

Courtesy of DAIMLERCHRYSLER CORP.