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1. Remove the fuel injector sight shield, if necessary.
Refer to "Fuel Injector Sight Shield Replacement: ".
2. Disconnect the engine wiring harness electrical
connector (3) from the heated oxygen sensor
(HO2S) electrical connector (4).
3. Remove the HO2S electrical connector retainer (5)
from the retainer clip.
4. Remove the HO2S (1) from the exhaust manifold.
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
Engine Electrical Devices:
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.
CAUTION
!
Refer to "Fastener Notice: ".
2. Install the HO2S (1) to the exhaust manifold.
Tightening torque
Tighten the sensor to 42 N⋅m (31 lb ft).
3. Connect the engine wiring harness electrical
connector (3) to the HO2S electrical connector (4).
4. Install the HO2S electrical connector retainer (5) to
the retainer clip.
5. Install the fuel injector sight shield, if necessary.
Refer to "Fuel Injector Sight Shield Replacement: ".
1C-15
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Table of Contents
Troubleshooting
