Does it not come under "fit for purpose" even tho its a private sale ??

Ok just checked this out and all it says is that it has to be as described
So i guess there's no come back on the seller as he didn't know the ass wipe in the garage didn't know how to map cars so all you can do is see when it was mapped , look at mileage and if it's not long ago then keep on at them and see what they going to do about it .

Sorry there's no easy way to get it sorted , unless you got 3k kicking about and put it down to experiance .