O2 Sensor: Description

The upstream oxygen sensor threads into the outlet flange of the exhaust manifold.

Fig 1: Identifying Upstream Heated Oxygen Sensor 1/1

Courtesy of DAIMLERCHRYSLER CORP.

Fig 2: Locating NGK O2 Sensors

Courtesy of DAIMLERCHRYSLER CORP.

The downstream heated oxygen sensor threads into the system depending on emission package Federal package the O2s is mounted after the catalytic convertor.

Fig 3: Identifying Downstream Heated Oxygen Sensor 1/2

Courtesy of DAIMLERCHRYSLER CORP.