Envoy 2WD V8-5.3L (2007)
Catalytic Converter: Service and Repair
Catalytic Converter Replacement (5.3L and 6.0L Engines)
Removal Procedure
1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle.
Notice: Refer to Heated Oxygen and Oxygen Sensor Notice.
Notice: Refer to Excessive Force and Oxygen Sensor Notice.
2. Unscrew both front heated oxygen sensor (HO2S) sensors (1) from the catalytic converter.
3. Unscrew both rear HO2S sensors (2) from the catalytic converter.
4. Remove the rear propeller shaft. Refer to Rear Propeller Shaft Replacement.
5. If equipped with four wheel drive (4WD), Remove the front propeller shaft. Refer to Front Propeller Shaft Replacement.
6. Support the transmission with a transmission jack.
7. Remove the transmission support. Refer to Transmission Support Replacement.
8. Remove the exhaust muffler nuts.
