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    Codes, codes, and more codes

    Hey, newbie here, in have an issue with my 01 Z71, 5.3 Tahoe, the service engine soon light is on, the codes are P0405, P0446, and P0405 again (autozone), which is a bad egr valve, but I replaced the egr like 6 months ago, the ses light never went away, any suggestions on what this problem can...
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