Chevrolet Silverado / GMC Sierra. Service manual — part 1828

Fig. 137: View Of Front HO2S, Electrical Connector & CPA Retainer
Courtesy of GENERAL MOTORS CORP.

10. Remove the connector position assurance (CPA) retainer (3) from the left front heated

oxygen sensor (HO2S).

11. Disconnect the engine wiring harness electrical connector (2) from the left front HO2S (1)

electrical connector.

2008 Chevrolet Silverado 1500

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

Fig. 138: View Of Rear HO2S, CPA Retainers & Electrical Connectors
Courtesy of GENERAL MOTORS CORP.

12. Remove the CPA retainer (8) from the left rear HO2S.

13. Disconnect the engine wiring harness electrical connector (4) from the left rear HO2S

electrical connector (3).

2008 Chevrolet Silverado 1500

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

Fig. 139: View Of Exhaust Manifold Pipe, Gasket, Bolt & Manifold
Courtesy of GENERAL MOTORS CORP.

14. Loosen the exhaust manifold pipe to exhaust manifold nuts.

2008 Chevrolet Silverado 1500

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

Fig. 140: View Of Exhaust Manifold, Bolts, Catalytic Converter & Gasket
Courtesy of GENERAL MOTORS CORP.

15. Remove the left catalytic converter to exhaust manifold nuts.

16. Using the transmission jack, lower the transmission slightly.

2008 Chevrolet Silverado 1500

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