[HDFord]

Maybe this works

pawn Код:

if (strcmp(cmd, "/siren", true) == 0)//also try to put a space between "if" and (strcmp(====== it might work  sometimes
    {
        AttachObjectToVehicle(19420,(GetPlayerVehicleID(playerid)), 0.0, 0.0, 1.0, 0.0, 0.0, 0.0);
        return 1;
    }