[Tatsfield]

While there may be some reason to use one of these Bluetooth/ELM reader set ups to see a specific readout that it can provide that the car doesn't display, like perhaps oil pressure or coolant temperature, if you feel that you need to see this sort of data while driving, the only sure-fire way of reading all the car modules and their fault logs is by using VIDA/DiCE. Since this kit is astoundingly cheap for what it does, £100 will buy everything including an ancient laptop upon which to run it, there really doesn't seem to be much reason to try to avoid buying it. It's really like insisting on using a set of non metric spanners on your car when you could buy a full metric set for a reasonable sum of money.