[Pingperfect]

I have made one before, and I can hand you a working one.
It's just in two pieces, but you can just chance that.

pawn Код:

command(sirenon, playerid, params[])
{
    new vehicleid = GetPlayerVehicleID(playerid);
    if(Factions[Player[playerid][Faction]][fType] == 1  || Factions[Player[playerid][Faction]][fType] == 2)
    {
        if(FactionCar[vehicleid] == 1)
        {
            if(VehicleFaction[vehicleid] == Player[playerid][Faction])
            {
                if(Siren[vehicleid] == 1)return SendClientMessage(playerid, GREY, "This vehicle already has a siren!");
                Siren[vehicleid] = 1;
                SirenObject[vehicleid] = CreateObject(18646, 10.0, 10.0, 10.0, 0, 0, 0);
                AttachObjectToVehicle(SirenObject[vehicleid], vehicleid, 0.0, 0.75, 0.275, 0.0, 0.1, 0.0);
            }
            else return SendClientMessage(playerid, GREY, "This vehicle isn't a part of your faction.");
        }
        else return SendClientMessage(playerid, GREY, "This isn't a Faction vehicle.");
    }
    else return SendClientMessage(playerid, GREY, FactionOnly);
    return 1;
}

command(sirenoff, playerid, params[])
{
    new vehicleid = GetPlayerVehicleID(playerid);
    if(Factions[Player[playerid][Faction]][fType] == 1 || Factions[Player[playerid][Faction]][fType] == 2)
    {
        if(FactionCar[vehicleid] == 1)
        {
            if(VehicleFaction[vehicleid] == Player[playerid][Faction])
            {
                if(Siren[vehicleid] == 0)return SendClientMessage(playerid, GREY, "This vehicle doesn't have a siren on it!");
                Siren[vehicleid] = 0;
                DestroyObject(SirenObject[vehicleid]);
            }
            else return SendClientMessage(playerid, GREY, "This vehicle isn't a part of your faction.");
        }
        else return SendClientMessage(playerid, GREY, "This isn't a Faction vehicle.");
    }
    else return SendClientMessage(playerid, GREY, FactionOnly);
    return 1;
}