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Home >> GMC >> 2012 >> Sierra Denali AWD V8-6.2L >> Repair and Diagnosis >> Powertrain Management >> Emission Control Systems >> Catalytic Converter >> Service and Repair >> Catalytic Converter Replacement - Left Side (ZW9)
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Catalytic Converter Replacement - Left Side (ZW9)




Catalytic Converter Replacement - Left Side (ZW9)

Removal Procedure

Warning: Refer to Exhaust Service Warning Service Precautions.

Warning: Refer to Hot Exhaust System Warning Hot Exhaust System Warning.

1. Disconnect the heated oxygen sensor (HO2S). Refer to the following:

* Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (2500 Series - Cab/Chassis) Service and RepairHeated Oxygen Sensor Replacement - Bank 1 Sensor 1 (2500 Series) Service and RepairHeated Oxygen Sensor Replacement - Bank 1 Sensor 1 (1500 Series) Service and Repair
* Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (2500 Series - Cab/Chassis) Service and RepairHeated Oxygen Sensor Replacement - Bank 1 Sensor 2 (2500 Series) Service and RepairHeated Oxygen Sensor Replacement - Bank 1 Sensor 2 (1500 Series) Service and Repair

2. Support the transmission with a suitable transmission jack.
3. Remove the transmission support crossmember. Refer to Transmission Support Crossmember Replacement (2WD 1500 Series) Transmission Support Crossmember Replacement (4WD 1500 Series) Transmission Support Crossmember Replacement (2WD 2500/3500 Series) Transmission Support Crossmember Replacement (4WD 2500/3500 Series)




4. Remove the exhaust muffler clamp nut (3).




5. Remove the exhaust manifold pipe to exhaust manifold nuts (1) and discard the seal (2).




6. Separate the catalytic converter hanger rod (1) from the exhaust isolator.
7. With the aid of an assistant, lower the catalytic converter (2) from the vehicle.
8. If replacing the catalytic converter, transfer the oxygen sensors.

Installation Procedure




1. Install the catalytic converter hanger rod (1) into the exhaust isolator.





Caution: Refer to Fastener Caution Fastener Caution.

2. Install a NEW seal (2) to the left manifold exhaust pipe. Tighten the nuts (1) to 50 Nm (37 lb ft).




3. Install the exhaust muffler to catalytic converter (2) with clamp nut (3) and tighten to 28 Nm (21 lb ft).
4. Install the transmission support crossmember. Refer to Transmission Support Crossmember Replacement (2WD 1500 Series) Transmission Support Crossmember Replacement (4WD 1500 Series) Transmission Support Crossmember Replacement (2WD 2500/3500 Series) Transmission Support Crossmember Replacement (4WD 2500/3500 Series)
5. Remove the support from the transmission.
6. Connect the HO2S sensors. Refer to the following:

* Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (2500 Series - Cab/Chassis) Service and RepairHeated Oxygen Sensor Replacement - Bank 1 Sensor 1 (2500 Series) Service and RepairHeated Oxygen Sensor Replacement - Bank 1 Sensor 1 (1500 Series) Service and Repair
* Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (2500 Series - Cab/Chassis) Service and RepairHeated Oxygen Sensor Replacement - Bank 1 Sensor 2 (2500 Series) Service and RepairHeated Oxygen Sensor Replacement - Bank 1 Sensor 2 (1500 Series) Service and Repair

7. Start the engine and check the front exhaust system for leaks.

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