[Nonameman]

pawn Код:

public OnPlayerStateChange(playerid, newstate, oldstate)
{
    if (newstate == PLAYER_STATE_DRIVER || newstate == PLAYER_STATE_PASSENGER) {
        if (GetVehicleModel(GetPlayerVehicleID(playerid)) == 451) {
            if (GetPlayerScore(playerid) < 50)
                RemovePlayerFromVehicle(playerid);
        }
    }
    return 1;
}

Try this