Question about 2000 GMC New Sierra 1500

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Service engin soon on a 2000 GMC sierra Z-71 5.3L 4x4 howe to erase that

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  • Anonymous Mar 26, 2009

    Code 420 when checked for service engine light. replaced both O2 sensors on bank 1. Light still comes on after being reset. Any Help Would be Appreciated.

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Try Removing the ECM Fuse from Panel for about 2 to 3 Min. Should clear codes.

Posted on Jan 03, 2009

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