There's catalyst (if there is one) that can be sold as it contains some precious metals. Depending on the year and make it might have electric power-steering column which inside has massive motor and torque sensor (quite expensive part for hobby projects.), also, car has wiper motors, fans, many switches, relays, fuses and loads of wires and LEDs/light bulbs. All control circuits are of no use, unless You're willing to de-solder tons of resistors, transistors and capacitors. All embedded circuits/controllers are not useful as they are most likely made for that specific circuit, hence cannot be reused/reprogrammed using available hobby programmers. Using scrapped car and some bought/built control circuitry You can probably make decent battle-bot or something similar.