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Removal - Upstream 1/1, 2/1

Raise and support vehicle.
Disconnect heated oxygen sensor electrical connector (Fig 1 ).

Fig 1: Removing 2/1, 2/2, O2 Sensors (Right Side)
Courtesy of DAIMLERCHRYSLER CORP.
Remove sensor using an oxygen sensor crow foot wrench such as Snap-On tool YA8875 or equivalent.