Is the plaintiff considered wronged in this case, and is he responsible for guaranteeing the first seller's recovery of his money, knowing that the car was seized from him due to a complaint, and he is given the choice between guaranteeing the money or sharing the loss from the sale of the car?

The first seller is an oppressor for taking the car, and he has no right to do so. What he takes from you due to this is unlawful (batil), based on the Almighty’s saying: "Do not consume your property among yourselves in falsehood." And based on the Prophet’s (peace be upon him) saying: "Indeed, your blood, your properties, and your honors are sacred to you." He must fear Allah and cease his oppression. If he has a right against his partner, he should demand it through legitimate means and not oppress others, based on the Almighty’s saying: "And let not the hatred of a people for having obstructed you from the Sacred Mosque lead you to transgress. And cooperate in righteousness and piety, but do not cooperate in sin and aggression."