Hummer H2. Manual - part 1901

5. Install the right exhaust manifold pipe nuts. 

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

Fig. 24: View Of Transmission 
Courtesy of GENERAL MOTORS CORP. 

6. Connect the oxygen sensor electrical connector (1).  

7. Connect the CPA retainer.  

8. Remove the adjustable jackstands from catalytic converter or exhaust manifold pipe.  

9. Install the engine protection shields. Refer to Engine Protection Shield Replacement in Frame and 

Underbody. 

Tighten: Tighten the bolts to 20 N.m (15 lb ft). 

10. Lower the vehicle.  

 

2004 Hummer H2 

2004 ENGINE Engine Exhaust - Hummer H2

  

CATALYTIC CONVERTER REPLACEMENT (RIGHT HAND)

Removal Procedure 

1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information. 

2. Remove the catalytic converter guard. Refer to Catalytic Converter Guard Replacement in Frame and 

Underbody. 

Fig. 25: View Of Transmission 
Courtesy of GENERAL MOTORS CORP. 

3. Disconnect the connector position assurance (CPA) retainers.  

4. Disconnect the oxygen sensor electrical connectors (1, 2).  

5. Remove the catalytic converter to muffler flange nuts. 

 

2004 Hummer H2 

2004 ENGINE Engine Exhaust - Hummer H2

  

Fig. 26: Exhaust Manifold Pipe Nuts (Left) 
Courtesy of GENERAL MOTORS CORP. 

6. Remove the left exhaust manifold pipe nuts. 

 

2004 Hummer H2 

2004 ENGINE Engine Exhaust - Hummer H2

  

Fig. 27: Exhaust Manifold Pipe 
Courtesy of GENERAL MOTORS CORP. 

7. Remove the catalytic converter. 

 

2004 Hummer H2 

2004 ENGINE Engine Exhaust - Hummer H2