[Fj0rtizFredde]

For the people above me.. You don't need to use sscanf if you're just using 1 parameter.
Here is a simple version for you to play around with:

pawn Code:

CMD:deleteveh(playerid, params[])
{
    if (!IsPlayerAdmin(playerid)) return SendClientMessage(playerid, KLEUR_WIT, "You are not an Administrator.");
    else if(isnull(params)) return SendClientMessage(playerid, KLEUR_WIT, "{B4B5B7}USAGE: /deleteveh [vehicleid]");
    else
    {
        new vehicleid = strval(params);
        if(vehicleid == INVALID_VEHICLE_ID) return SendClientMessage(playerid,-1,"Not a vaild vehicle");
        DestroyVehicle(vehicleid);
        new string[128];        
        format(string, sizeof(string), "You succesfully deleted vehicle ID: %i", vehicleid);
        SendClientMessage(playerid,-1,string);
    }
    return 1;
}