K 1500 Suburban 4WD V8-5.3L VIN Z Flex Fuel (2003)
7. Remove the clip from around the engine harness and the oxygen sensor pigtail.
8. Disconnect the Connector Position Assurance (CPA) retainers.
9. Disconnect the oxygen sensor electrical connectors.
10. Unclip the oxygen sensor electrical connectors from the following:
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Hose clip
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Transmission crossmember
11. Disconnect the CPA retainers.
12. Disconnect the oxygen sensor electrical connectors (1, 2).
13. Remove the left exhaust manifold pipe nuts.
