REMOVAL - UPSTREAM 1/1 or 2/1

The engines uses two heated oxygen sensors, one in each exhaust manifold.

CAUTION: When disconnecting the sensor electrical connector, do not pull directly on wire going into sensor.

Remove the negative battery cable.
Disconnect the heated oxygen sensor electrical connector.
Use a socket such as Snap-On YA8875 or a crow foot wrench to remove oxygen sensor (Fig 1).

Fig 1: Upstream Heated Oxygen Sensor 1/1
Courtesy of DAIMLERCHRYSLER CORP.