Silverado 3500 4WD V8-6.0L (2007)
7. Loosen the exhaust muffler clamp (3).
8. Separate any necessary exhaust muffler insulators so that the pipe may be separated from the muffler.
9. Use a jack stand to support the muffler.
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.
