Exhaust Pipe: Service and Repair

Exhaust Crossover Pipe Replacement

Removal Procedure

1. Disconnect the battery ground cable from the battery. Refer to Battery Negative Cable Disconnection and Connection (Service and Repair) .
Caution: Refer to Exhaust Service Caution (Service Precautions) .
Caution: Refer to Protective Goggles and Glove Caution (Protective Goggles and Glove Warning) .
Caution: Refer to Vehicle Lifting Caution (Service Precautions) .
2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle (Service and Repair) .
3. Support the exhaust system using a suitable jack.
4. Remove the rear exhaust muffler assemblies. Refer to Exhaust Muffler Replacement - Left Side (Service and Repair) and Exhaust Muffler Replacement - Right Side (Service and Repair) .





Notice: Refer to Heated Oxygen and Oxygen Sensor Notice (Heated Oxygen and Oxygen Sensor Notice) .

5. Disconnect the left post-catalytic converter heated oxygen sensor (HO2S) electrical connector (1).




6. Disconnect the right post-catalytic converter HO2S electrical connector (1).





Important: The intermediate exhaust assembly to left catalytic converter retaining nuts (3) are single use parts. They must be discarded after removal.


7. Remove the intermediate exhaust assembly to left catalytic converter retaining nuts (3).
Discard the nuts.
8. Disconnect the intermediate exhaust assembly (2) from the left catalytic converter (1).





Important: The intermediate exhaust assembly to right catalytic converter retaining nuts (3) are single use parts. They must be discarded after removal.


9. Remove the intermediate exhaust assembly to right catalytic converter retaining nuts (3).
Discard the nuts.
10. Disconnect the intermediate exhaust assembly (2) from the right catalytic converter (1).




11. Remove the intermediate exhaust assembly to rear muffler retaining bolts (3).




12. Detach the intermediate exhaust assembly (2) by removing the centre insulator hanger bracket to differential retaining bolt (1).
13. Carefully lower the intermediate exhaust assembly from the vehicle.
14. Remove the left post-catalytic converter HO2S. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (Service and Repair) or Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (Service and Repair) .
15. Remove the right post-catalytic converter HO2S. Refer to Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (Service and Repair) or Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (Service and Repair) .



Installation Procedure

1. Clean all threads and flange faces of the intermediate exhaust system.
2. Always check the condition of the catalytic converter to intermediate pipe flange gaskets and replace as necessary.
3. Install the left post-catalytic converter HO2S to the intermediate exhaust system. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (Service and Repair) or Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (Service and Repair) .
4. Install the right post-catalytic converter HO2S to the intermediate exhaust system. Refer to Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (Service and Repair) or Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (Service and Repair) .

Notice: Refer to Exhaust System Inspection Notice (Service Precautions) .


Notice: Refer to Exhaust Service Caution (Service Precautions) .

5. Position the intermediate exhaust assembly to the vehicle using a suitable jack.




6. Attach the intermediate exhaust assembly (2) by installing the centre insulator hanger bracket to differential retaining bolt (1).
7. Tighten the intermediate exhaust assembly to rear muffler retaining bolts.

Tighten the bolts to 45 N.m (33 lb ft).





8. Align the intermediate exhaust assembly (2) to the right catalytic converter (1).

Notice: Refer to Fastener Notice (Fastener Notice) .

9. Tighten the intermediate exhaust assembly to right catalytic converter retaining nuts (3).

Tighten the nuts to 40 N.m (30 lb ft).





10. Align the intermediate exhaust assembly (2) to the left catalytic converter (1).
11. Tighten the intermediate exhaust assembly to left catalytic converter retaining nuts (3).

Tighten the nuts to 40 N.m (30 lb ft).





12. Connect the right post-catalytic converter HO2S electrical connector (1).




13. Connect the left post-catalytic converter HO2S electrical connector (1).




14. Connect the left rear muffler (1) to the intermediate exhaust assembly (2).

Notice: Refer to Fastener Notice (Fastener Notice) .

15. Install the left rear muffler to intermediate exhaust assembly retaining bolts (3).

Tighten the bolts to 45 N.m (33 lb ft).

16. Make sure that the exhaust system is clear of all other components and chassis. If the exhaust system is not clear of all the other components loosen all retaining nuts and re-align. Refer to Exhaust System Alignment (LY7 and L98 Engines) (Service and Repair) .
17. Lower the vehicle to the ground.
18. Connect the battery ground cable to the battery. Refer to Battery Negative Cable Disconnection and Connection (Service and Repair) .
19. If re-programming is required. Refer to Control Module References (Programming and Relearning) .
20. Perform diagnostic system check using diagnostic scan tool, clear all relative DTCs and inspect the system for correct operation.