[Yera96]

This code looks better in my opinion. When player warps a vehicle OnPlayerEnterVehicle is not called. So put a variable which says that OnPlayerEnterVehicle is called.

pawn Код:

public OnPlayerEnterVehicle(playerid, vehicleid, ispassenger)
{
    SetPVarInt(playerid, "CurrentVehicle", vehicleid);
    return 1;
}

And when OPSC is called, check if player's current vehicle matches the variable we set in OPEV.

pawn Код:

public OnPlayerStateChange(playerid, newstate, oldstate)
{
    if(newstate == 2 || newstate == 3)
    {
        if(GetPVarInt(playerid, "CurrentVehicle") != GetPlayerVehicleID(playerid))
        {
            Kick(playerid);
        }
    }
    return 1;
}

Sorry for my english.