[dice7]

pawn Код:

dcmd_respawncars(playerid, params[])
{
    #pragma unused params
    new pname[MAX_PLAYER_NAME], file[128];
    GetPlayerName(playerid, pname, sizeof(pname));
    format(file, sizeof(file), "\\Users\\%s.ini", pname);
    if(dini_Int(file, "level") >= 4)
    {
        for(new i=0; i <= MAX_VEHICLES; i++) for(new a=0; a < MAX_PLAYERS; a++)if(!IsPlayerInVehicle(a, i)) SetVehicleToRespawn(i);
        {
          for(new a=0; a < MAX_PLAYERS; a++)if(!IsPlayerInVehicle(a, i)) SetVehicleToRespawn(i);
          {
                if(!IsPlayerInVehicle(a, i)) SetVehicleToRespawn(i);
                {
                    SetVehicleToRespawn(i);
                }
            }
        }
        SendClientMessageToAll(COLOUR_YELLOW, "[ADMIN]: Vehicles respawned by admin!");
        return 1;
    }
    else SendClientMessage(playerid, COLOUR_RED, "You are not allowed to use this command!");
    return 1;
}

A return breaks the code with no question, so your code stopped at the first iteration (respawning vehicle id 0, which doesn't exist)