ECU Remapping is the process used to tailor the common functions set out within a vehicle’s ECU. An ECU is programmed by car manufacturers to control the engine’s functions & therefore all ECU’s need to be programmed with alot of tolerance. Car manufacturers need to take this precaution as they have to cater for the diverse number of markets that their vehicle may end up in. The ECU needs to cover the levels of neglect some vehicle owners show their vehicle engine, in terms of servicing & upkeeping.