O2 Sensor: Description

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

Fig 1: Upstream Heated Oxygen Sensor 1/2

Courtesy of DAIMLERCHRYSLER CORP.

Fig 2: Upstream Heated Oxygen Sensor 1/1

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: Downstream Heated Oxygen Sensors-1/2 (R) 2/2 (L)

Courtesy of DAIMLERCHRYSLER CORP.