Chevrolet Silverado / GMC Sierra. Service manual — part 1821

Fig. 111: View Of Left Front HO2S Electrical Connector Clip & Engine Wiring
Harness Electrical Connector
Courtesy of GENERAL MOTORS CORP.

11. For vehicles equipped with a 4L60-E/4L70-E automatic transmission perform the following

steps, for vehicles equipped with a 6L80-E automatic transmission proceed to step 15.

12. Remove the left front CPA retainer.

13. Disconnect the engine wiring harness electrical connector (2) from the left front HO2S.

14. Remove the left front HO2S electrical connector clip (1) from the fuel line clip.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Exhaust - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 112: View Of Engine Wiring Harness Electrical Connector Clip & Electrical
Connector
Courtesy of GENERAL MOTORS CORP.

15. Remove the left front CPA retainer (2).

16. Remove the engine wiring harness electrical connector clip (1) from the fuel line clip.

17. Disconnect the engine wiring harness electrical connector (3) from the left front HO2S.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Exhaust - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 113: View Of Catalytic Converter To Muffler Nuts
Courtesy of GENERAL MOTORS CORP.

18. If the vehicle is a 1500 series, remove the catalytic converter to muffler nuts.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Exhaust - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 114: View Of Catalytic Converter To Muffler Nuts
Courtesy of GENERAL MOTORS CORP.

19. If the vehicle is a 2500/3500 series, remove the muffler to catalytic converter nuts.

20. Remove the HO2S. Refer to Heated Oxygen Sensor Replacement - Bank 2 Sensor 1

(1500 Series) or Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (2500 Series)
or Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (2500 Series -
Cab/Chassis) .

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Exhaust - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado