O2 Sensor: Description

The upstream oxygen sensor threads into the outlet flange of the exhaust manifold. See See Fig 3.Fig 1.

Fig 1: Upstream Heated Oxygen Sensor

Courtesy of DAIMLERCHRYSLER CORP.

1 - OXYGEN SENSORS

2 - EXHAUST MANIFOLD

The downstream heated oxygen sensor threads into the system depending on emission package. See Fig 2. Federal package the O2s is mounted after the catalytic convertor.

Fig 2: Downstream Heated Oxygen Sensor

Courtesy of DAIMLERCHRYSLER CORP.

Fig 3: NGK O2 Sensors

Courtesy of DAIMLERCHRYSLER CORP.