When a DTC comes up on the scan, this means that there is an error or problem in the system. The DTC could be from the accident, from the repair process, or a previous issue altogether. Simply deleting these codes can leave the door open for problems further on.

What happens when you erase OBD2 codes?

On clearing the codes with the “Erase Codes” function, the system status changes to “Not Ready”. Drive for 50 to 100 miles (80 to 160 km). Take several individual trips until the system reads the status of all the components once more. “Several trips” means you shut off the engine and start another trip each time.

Is it OK to clear engine codes?

If your main reason for buying an inexpensive scanner is to reset the check-engine light, know this: clearing the code and turning the light off doesn't mean your issue has gone away. ... It's possible that the warning light won't come back on after you clear the code.