anyone know the difference between the different ecu codes on the mk2 2L mondeos? got a 99 2L with the ecu code BASH & only 1 key for the car, ford want £100 for a spare key or I can get the ecu & lockset with 3 keys off a m8 whos breaking one for £20 but the ecu code is OWL4. will this ecu work on my car or is it possible just swap the pats chip?