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Did you turn on the key (even if you didnt' start the engine) before installing the Muzzler? What does picking up a cheap code reader (less than $30 on Amazon) have to do with buying the Muzzler?
Did you make sure everything is plugged in completely? If so, simply removing will not clear the codes. The codes may clear after a few drives and key cycles, though.
Did you make sure everything is plugged in completely? If so, simply removing will not clear the codes. The codes may clear after a few drives and key cycles, though.