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Are you referring to an OBD code being reset after a repair was made? It will usually take one or two cycles to happen, a cycle may be engine running up to temp. So start, drive, then turn off you car a couple times should do it. If light is still on then you are still setting one or more trouble codes.
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Car had been sitting in the garage for two years put new battery in and tried to have an inspection performed and it could not communicate with the computer