Deleting the DTCs is really trivial. It's just a standard UDS command. The only way to avoid this kind of scam is buying vehicles that have done the official maintenance/inspection. That will report the odometer to the car maker.
>>fmntf+(OP)
> The only way to avoid this kind of scam is buying vehicles that have done the official maintenance/inspection.
Agree, but not everyone here can afford <5 year old vehicle, so people have to do with the means they have. As soon as warranty/lease ends, people generally go with cheaper, non-manufacturer maintenance shops.