Youngest bought me a bluetooth OBD2 plug thingy off ebay (for my birthday) , had to download Torque off Android market.
We were on hols when it came so youngest tested it on his car & reckoned it was quite good, showed up a couple of codes on his car - which he cleared.
Reckoned it was OK for £13.
I only looked at it as a way of having a digital speedo.
Interestingly, I can keep the car at about 28mph but my dash dial reads 30 & my satnav says 33.
Go figure!