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• Do not apply contact cleaner or other
materials to the sensor or vehicle harness
connectors. These materials may get into
the sensor causing poor performance.
• Do not damage the sensor pigtail and
harness wires in such a way that the wires
inside are exposed. This could provide a
path for foreign materials to enter the
sensor and cause performance problems.
• Ensure the sensor or vehicle lead wires are
not bent sharply or kinked. Sharp bends or
kinks could block the reference air path
through the lead wire.
• Do not remove or defeat the oxygen
sensor ground wire, where applicable.
Vehicles that utilize the ground wired
sensor may rely on this ground as the only
ground contact to the sensor. Removal of
the ground wire will cause poor engine
performance.
• Ensure that the peripheral seal remains
intact on the vehicle harness connector in
order to prevent damage due to water
intrusion. The engine harness may be
repaired using Packard's Crimp and Splice
Seals Terminal Repair Kit. Under no
circumstances should repairs be soldered
since this could result in the air reference
being obstructed.
1. Raise and support the vehicle. Refer to "Lifting and
Jacking the Vehicle: ".
2. Disconnect the heated oxygen sensor (HO2S)
electrical connector (2) from the engine wiring
harness electrical connector.
Engine Electrical Devices:
3. Remove the HO2S (2) from the catalytic converter.
Installation Procedure
NOTE
A special anti-seize compound is used in the
HO2S threads. The compound consists of
liquid graphite and glass beads. The graphite
tends to burn away, but the glass beads
remain, making the sensor easier to remove.
New, or service replacement sensors already
have the compound applied to the threads. If
the sensor is removed from an exhaust
component and if for any reason the sensor
is to reinstalled, the threads must have anti-
seize compound applied before the
reinstallation.
1. If reinstalling the old sensor, coat the threads with
anti-seize compound GM P/N 12377953, or
equivalent.
1C-13
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Troubleshooting
