O2 Sensor: Description

The upstream oxygen sensor threads into the outlet flange of the exhaust manifold (Fig 1) or (Fig 2).

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

Courtesy of DAIMLERCHRYSLER CORP.

Fig 2: Identifying 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 (Fig 3).

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

Courtesy of DAIMLERCHRYSLER CORP.