O2 Sensor: Description

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

Fig 1: O2 SENSOR UPSTREAM 1/1 4 CYLINDER

Courtesy of DAIMLERCHRYSLER CORP.

Fig 2: O2 SENSORS 2.7L

Courtesy of DAIMLERCHRYSLER CORP.

1 - Upstream 2/1

2 - Upstream 1/1

3 - Downstream 1/2

4 - Downstream 2/2

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 2/1 4 CYLINDER

Courtesy of DAIMLERCHRYSLER CORP.