Heated Oxygen Sensor 1: Removal

WARNING: This page is about a different car, the 2003 Pontiac Grand Am and 2003 Oldsmobile Alero. However, it is still accessible from the selected car via links, so may be relevant.

HO2S 1 is mounted on exhaust manifold. See Fig 1 or Fig 2 . Disconnect the negative battery cable.
Disconnect the oxygen sensor harness connector.
Remove the oxygen sensor using Heated Oxygen Sensor Socket (J 39194-B), or equivalent.

Fig 1: Removing/Installing HO2S 1 (2.2L)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Removing/Installing HO2S 1 (3.4L)

Courtesy of GENERAL MOTORS CORP.