How can you check if your DPF and EGR have been disabled?

So after buying a 2006 330d e90 from 2 previous owners the last knowing nothing about what had been modded from the first owner.

I dynoed it and found it was pushing out more power then stock yet it still has the DPF/EGR which I would like to remove.

Is there a way I can test if the remap has removed/disabled the DPF/EGR monitoring? would like to remove the DPF without having to get it remapped. is there any sensors I can disconnect to see if my cars DPF or EGR will throw errors?