PS

There is a flaw with det checking any car without remapping it.

The only proper way (imho) to det check a car, is to wind more advance on till it det's to see how many degrees from det you are, as if you just listen to a car on its current map all you can do is say "it doesnt det right now" but the thing is it might be only 1 degree away from doing so, and the slightest change (like slightly different fuel) could then push it past that limit if its so close.