[Nero_3D]

pawn Код:

//OnPlayerStateChange(playerid, newstate, oldstate)
    if(newstate == PLAYER_STATE_DRIVER) // use definitions, its easier
    {
        new CarCheck = GetPlayerVehicleID(playerid);
        if(CarCheck == Cars[TEAM_BALLAS])
        {
            if(GetPlayerTeam(playerid) != TEAM_BALLAS) // removed the return
            {
                RemovePlayerFromVehicle(playerid);
                SendClientMessage(playerid, COLOR_RED, "You Don't have the keys for this car!");
            }
        }

That will only work with one vehicleid but I think you want to disable more vehicles
Show us the code where you store the vehicleids in Cars