Avalanche 1500 2WD V8-5.3L (2008)
7. Disconnect the engine wiring harness electrical connector (3) from the right rear HO2S electrical connector.
8. Remove the right rear HO2S electrical connector clip from the engine harness clip (5).
9. Remove the left rear CPA retainer (1).
10. Disconnect the left rear HO2S electrical connector from the engine wiring harness electrical connector (3).
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.
