In the engine tuning industry, three phrases are often used interchangeably. These are: 'OBD Tuning', 'Chip Tuning' and 'ECU Remapping'. OBD stands for On Board Diagnostic. To make sense of this the word port is important because without the port, on board diagnostics would not actually exist; just as it didn't exist in the 1980's. So any 'OBD port tuning' or 'obd port remap' is just engine tuning or engine remapping completed via the use of the car's obd port.
