What Are Car Diagnostics?

So what exactly does the term “Car Diagnostics” mean? Suzanne Keane explains all One of the most common complaints you hear about garages these days is how much they charge for “switching off” a dash light or for “plugging the car into the computer”.  But what is it they actually do? Since the early 90s most cars have come equipped with an E.C.U. (Engine Control Unit). Over time these have grown – and become more...