I'm not sure if it's true, but someone told me recently that engine warning lights can be disabled for a short period of time, and that dodgy dealers are doing this often?Worse are the ones trying to hide the engine management light - when I was needing to buy a car in a hurry it was a pain so many cars misrepresented. I'd rather just spend a little over the odds and buy from an established garage/dealer with a reasonable reputation.
I haven't been able to verify, could be an urban myth.
. Not sure I'd brave a car though, I tend to go down the route of part ex, mainly as the cars we buy tend to be a fair amount (my last car I got 20k for and that is in the realms of getting jacked or something similar while selling imo, also I'd worry about the type of people who would visit).