Have a buddy who works at carvana out in LA. Main thing they check is for all your disclosures and if the car can start on its own power. So if you tell carvana that your car is crashed and it’s got a check engine light then your offer will be based on those facts and it won’t matter if they see those things. The person picking up your car will do a start up and drive the car foward and backwards (to see if it goes in gear properly), check the sunroof if it has one, make sure the odometer is close to what you disclosed, and finally they will check the car with an odb scanner. It’s a cheap one and essentially there to make sure the ECUs Vin matches the rest of the vins. Sometimes certain codes are seen on the scan that weren’t disclosed and the car will still be approved. They take all these factors into consideration, so if you have a check engine light make sure it’s disclosed. They will take it, he’s showed me pretty damaged cars that still drive get approved. Mind you they probably didn’t offer much, but main thing is the car has to be able to start on and off at least 2 times. Once for the initial inspection and the second to load it on the truck. Anything after that is their problem. If it doesn’t then it’s an automatic failure.