[MP2]

pawn Код:

new gAdminVeh[MAX_VEHICLES];

CMD:acar(playerid, params[])
{
    // Blah blah blah
    new vid = CreateVehicle(...);
    gAdminVeh[vid] = 1;
    return 1;
}

public OnPlayerStateChange(playerid, newstate, oldstate)
{
    if(newstate == 2) SetPVarInt(playerid, "lastveh", GetPlayerVehicleID(playerid));

    new lastveh = GetPVarInt(playerid, "lastveh");
    if(oldstate == 2 && gAdminVeh[lastveh] == 1)
    {
        DestroyVehicle(lastveh);
        gAdminVeh[lastveh] = 0;
    }
}

Not tested.