Exhaust System: Service and Repair

Exhaust System Replacement (With LY7 or LLT) (3.6 L)

Removal Procedure
Warning: Refer to Protective Goggles and Glove Warning (Protective Goggles and Glove Warning).

Warning: Refer to Exhaust Service Warning (Service Precautions).





1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle (Service and Repair).
2. Disconnect the left bank and the right bank heated oxygen sensor (HO2S) electrical connectors (bank 1 shown, bank 2 similar).
3. Disconnect both the HO2S harnesses from the transmission case.




4. Remove the floor panel tunnel brace bolts.
5. Remove the floor panel tunnel brace from the floor panel.




6. Remove the catalytic converter to the exhaust pipe nuts and separate the exhaust system from the catalytic converters.
7. Using an adjustable jack stand, support the rear of the exhaust system.
8. Apply a non petroleum based lubricant to the exhaust insulators and the hanger rods to aid in removal and installation.
9. Remove the rear exhaust system insulators from the exhaust hangers, leaving the insulators attached to the body hangers. Refer to Exhaust System Insulator, Hanger, Bracket Replacement (Exhaust System Insulator, Hanger, Bracket Replacement).




10. With the aid of an assistant, lower the exhaust system from the vehicle.
11. Remove the left bank and the right bank HO2S from the exhaust system. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (Service and Repair) and Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (Service and Repair).

Installation Procedure

1. Install both the HO2S to the exhaust system. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (Service and Repair) and Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (Service and Repair).





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

Caution: Refer to Flex Decoupler Caution (Flex Decoupler Caution).

2. With the aid of an assistant, raise the exhaust system to the insulators and to the catalytic converters.
3. Install the muffler hanger rods to the body insulators. Refer to Exhaust System Insulator, Hanger, Bracket Replacement (Exhaust System Insulator, Hanger, Bracket Replacement).




4. Position the exhaust pipe to the catalytic converters.

Caution: Refer to Fastener Caution (Fastener Caution).

5. Install the catalytic converter to the exhaust pipe nuts and tighten to 17 Nm (13 lb ft).




6. Install the floor panel tunnel brace to the floor panel.
7. Install the floor panel tunnel brace bolts and tighten to 25 Nm (18 lb ft).




8. Connect the left bank and the right bank 2 HO2S electrical connectors (bank 1 shown, bank 2 similar).
9. Install the HO2S wiring harnesses to the transmission case.
10. Lower the vehicle.
11. Inspect for exhaust leaks.