Many garages have their own engine diagnostics testing devices but the fact is they have become rather affordable for general motorists. This type of device aims to give the mechanic or the car owner an idea on the problems with the engine, and if you have a light come on, on your dashboard, then a diagnostics device will be able to read the fault and erase it. The device connects to the engine’s ECU and because more and more car’s rely on electrics, it’s important to be able to understand exactly what’s going on. This type of device does require a good amount of mechanic knowledge, and it can actually be an excellent device to use, especially before a service or an MOT.