I'd be all on board with a law that mandates a vehicle inspection certificate if you want to sell a car. I think buyers would probably like that too. It would cut down on lemons. It would make the second hand car market more efficient.
Obviously that would require accreditation but the accreditation bar for inspecting a car will be much lower than it would be for fixing it.
Or, you could take a different approach and just make it illegal to fix your own car if you're not part of a government mandated car fixing cartel.
While it is not a law (in my area at least), I would not buy a car without a recent inspection.
I would support a law that requires a special, more in-depth inspection in order to sell a car. My area has a (kind of) similar law...if you are buying an R title vehicle from out of state, then you have to get an "enhanced" inspection, with pictures before you can register it. I like that law and I would support making the enhanced inspection manditory for all car sales...I would put the onus on the seller though, but that's just me.
Obviously that would require accreditation but the accreditation bar for inspecting a car will be much lower than it would be for fixing it.
Or, you could take a different approach and just make it illegal to fix your own car if you're not part of a government mandated car fixing cartel.