O2 Sensor: Description: Description

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

Fig 1: Identifying Front O2 Sensors - 2.7

Courtesy of CHRYSLER LLC

The downstream heated oxygen sensor threads into the outlet pipe at the rear of the catalytic converter.

Fig 2: Identifying Rear O2 Sensors - 2.7

Courtesy of CHRYSLER LLC