Removal Procedure

Fig 1: Removing Exhaust Crossover Pipe

Courtesy of GENERAL MOTORS CORP.

IMPORTANT: The front exhaust pipe and catalytic converter are only serviced as an assembly; components are not serviced separately.

Remove the exhaust crossover pipe. Refer to Exhaust Crossover Pipe Replacement .

Fig 2: Removing HO2S

Courtesy of GENERAL MOTORS CORP.

IMPORTANT: The heated oxygen sensor (HO2S) 2 uses a permanently attached pigtail and connector. This pigtail should not be removed from the sensor. Damage or removal of the pigtail or connector will affect proper operation of the sensor.

Remove HO2S 2 using the J 39194-B .

Fig 3: Removing Nuts At Outlet Of Catalytic Converter To Crossover Pipe

Courtesy of GENERAL MOTORS CORP.

Remove the 3 exhaust pipe nuts at the manifold.
Remove the nuts at the outlet of the catalytic converter to crossover pipe.
Inspect the exhaust pipe-to-exhaust manifold flange.
Exhaust Pipe to Manifold Flange Warpage:
- Service Limit: 0.7 mm (0.028 in) max.
- Standard: 0.7 mm (0.028 in) max.