While at Trax a couple of members were asking about OBD interfaces and which apps to use

For users of Android phones
Bluetooth ELM327 interface

Torque App

For users of IPhones
[url=http://www.ebay.co.uk/itm/ELM327-WiFi-OBD2-OBDII-Car-D

I have found a couple of useful apps for Android that work wel for the Astra J (I am not the developer and don't know the developer).
OPL DTC Reader works well with an ELM Bluetooth OBDII reader and can read Vauxhall/ Opel specific errors. My normal OBDII reader would not read my Glowplug error on my 2.0 CDTi but this app can and was able to reset the fault code.

The same developer also made OPL DPF Monitor lite that can see how full the particulate filter is and will show if it is doinf a r