When you’re interested in purchasing a car to flip don’t just assume that the seller’s words are facts. Do your own research no matter what the seller says about the car.
That’s not to say that everyone is trying to rip you off because they aren’t. Though you might run into someone that IS trying to rip you off, I’ve found that most people just want to sell their car and don’t have any malicious intent.
Major problems usually don’t occur because the seller is lying to you about car problems. In my experience the majority of problems occur because the seller just didn’t know about everything.
It’s ultimately your job to do all of the research and make sure you’re buying a good car. After all, when you sell a bad car to someone else, it will be your reputation on the line, not the person’s that you bought it from.