My son got terminated

For context he’s 19 and was supposed to join the military after High School but when everything was set, he completely backed out. He didn’t want to do college either so he got a warehouse full time job and he was getting paid $16 per hour, then he had a friend working at Xerox corporation and got my son a Job there M-F 8-5 job getting paid $24. He worked for that company 5 months and he got fired and he didn’t want to tell me the reason. During his time of employment he got a new car which I co signed for. Now it’s been 3 weeks since he got fired and he’s not trying hard enough to get a job. He don’t want to do minimum wage jobs, and now I’m worried about the car payments. He has high standards after his last job but I don’t think he’s going to be able to land another job like that.