Every vehicle made after 1996 is equipped with an OBD-II (On-Board Diagnostics) port. Mechanics plug a scan tool into this port to read trouble codes generated by your car’s computer. These codes are known as Diagnostic Trouble Codes (DTCs). • Example: P0300 indicates a random misfire. • Example: P0455 points to a large EVAP leak, possibly from a loose gas cap. These codes don’t te... https://denverautorepairandservice.com/check-engine-light/