Quantum Tuning Ltd
On-board diagnostics, or OBD, is an automotive term referring to a vehicle's self-diagnostic and reporting capability. OBD systems give the vehicle owner or a repair technician access to state of health information for various vehicle sub-systems. The amount of diagnostic information available via OBD has varied widely since the introduction in the early 1980s of on-board vehicle computers, which made OBD possible. Early instances of OBD would simply illuminate a malfunction indicator light, or MIL, if a problem was detected—but would not provide any information as to the nature of the problem. Modern OBD implementations use a standardized digital communications port to provide real-time data in addition to a standardized series of diagnostic trouble codes, or DTCs, which allow one to rapidly identify and remedy malfunctions within the vehicle.
The OBD system provides owners with an early warning of malfunctions by way of a dashboard "Check Engine" light (also known as a Malfunction Indicator Light or MIL, for short). By giving vehicle owners this early warning, OBD protects not only the environment but also consumers, identifying minor problems before they become major repair bills.
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.