OBDII Multiplex Interface.
It has the ability to switch between diagnostic and remap.
Of course some newer cars maps file can't be accessed via the OBDII ports but the majority can.
Eventually all MOT stations will have to purchase the Multiplex interfaces so new diagnostic equipment can access the map file and compare it with an original stored on a data base.
If the files don't match, instant fail. Mr MOT then charges you a fortune to reinstall the original map or the car fails ..
Let me put it this way,the person who announced this shouldnt be trusted to push a wheel barrow and if you knew anything about ecu's ( the ones produced up to a year or so ago)w you wouldn't be repeating it.
Lets say that somebody created this HUGE database of original files for all makes of cars,estimated at the moment at over 50000.
How do you read the ecu's that cannot be read through OBD with ANY tool???
Are they going to be exempt?????
And the ones that could be read but take an hour?
How long would an MOT take to do?
And what super computer could do the comparison automatically?
Do you want me to continue??
Having said all this there are new ecu.s that do an autocheck but we will not go into that.