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John5

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  1. I have a 2020 3500 Denali and has been in the dealer once or twice a week for the past month for the same P20EE code. Updated software twice, removed and reinstalled software twice, changed NOX sensor twice, and cleaned MAP sensor once. Light stays off for about 60 miles each time. I'll just wait for GM to come up with a legitimate fix or get a lemon law attorney and hope they just replace with a 2023????????????
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