Hello Jay,
I think you are missing the all important point that he doesn’t have to tell you what is wrong with the car - it is up to you to assess the vehicle before you buy it.
Now if he uses phrases such as ‘good condition’, ‘drives beautifully’ etc. then the vehicle must meet those descriptions. If his description is non-specific then the court is quite likely to simply judge its condition against that description.
If you show us a copy of the advert then I’m sure it will be possible to advise how sound your claim will be.
Regrettably, your written contact with him mentioning fault codes etc. dilutes your case by inferring you are ‘….handy with cars…’ which is what you have said, so you should be more capable than most of assessing what you were buying.
I know this isn’t what you want to hear, but Clifford’s advice maybe worth a coat of thinking about, and you may end up with expenditure on reports etc. which may just result in more hassle than the worth of the outcome.
Just send us a copy of the advert description Jay and we will then have a far better idea of what you are up against, and things maybe much brighter than my pessimistic view.
Kind regards,
Gareth.