Hummer H2. Manual - part 1902

Fig. 28: Identifying O2 Sensors 
Courtesy of GENERAL MOTORS CORP. 

8. Remove the oxygen sensors if the catalytic converter is to be replaced.  

Installation Procedure 

 

2004 Hummer H2 

2004 ENGINE Engine Exhaust - Hummer H2

  

Fig. 29: Identifying O2 Sensors 
Courtesy of GENERAL MOTORS CORP. 

1. If the catalytic converter was replaced, perform the following: 

1. Apply anti-seize compound GM P/N 12377953 or equivalent to the threads of the old oxygen 

sensors.  

2. Install the oxygen sensors. 

Tighten: Tighten the oxygen sensors to 42 N.m (31 lb ft).

NOTE:

Refer to Fastener Notice in Cautions and Notices.

 

2004 Hummer H2 

2004 ENGINE Engine Exhaust - Hummer H2

  

Fig. 30: Exhaust Manifold Pipe 
Courtesy of GENERAL MOTORS CORP. 

2. Install a NEW exhaust seal to the exhaust manifold.  

3. Install the catalytic converter. 

 

2004 Hummer H2 

2004 ENGINE Engine Exhaust - Hummer H2

  

Fig. 31: Exhaust Manifold Pipe Nuts (Left) 
Courtesy of GENERAL MOTORS CORP. 

4. Install the left exhaust manifold pipe nuts. 

Tighten: Tighten the exhaust manifold pipe nuts to 50 N.m (39 lb ft).

 

2004 Hummer H2 

2004 ENGINE Engine Exhaust - Hummer H2