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Q: failed smog computer problem on 2001 Volkswagen Passat

my dad took my passat to get smogged it failed he said that the computer didnt register with the computer at the smog something with the ODBII we had it at a shop getting fixed so we know that the fuses are good the check engine light was on put everything was fixed at the shop any suggestions on what to do next otherwise we are taking it to a dealer thanks
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