I am starting to upload the files and a 'Howto' for a DIY version of this device.
The EGR delete section monitors for and cancels EGR related faults generated as a result of blocking the EGR completely. If other faults are present faults are no longer cancelled which allows the MIL light to be activated for other faults.
The DPF regen cancel section performs a 'device test' on the DPF. The first part of the test resets the clogging % value, which is then allowed to rise to 50% before the test is restarted. Regens normally only occur above 80% during this test procedure, therefore regens are held off by repeatedly restarting the test
There has been no harmful side effect, no side effect at all in fact, to using either of these methods. My DPF has been reset literally thousand of times now.
I have driven with this device in place for a few thousand miles and am pleased that with the EGR and DPF taken care of the car is driving much better.
The pic12F1822 will need to be programmed with software, which will be uploaded later (today hopefully) The only thing you need apart from this £0.70 microcontroller is an OBD bluetooth dongle, costing less than £10.
You need to remove the bluetooth dongle's bluetooth module, outlined in yellow in this picture Inside dongle | Flickr - Photo Sharing!
and connect the relevant microcontroller's pins to 3.3Vdc, 0V(gnd), TX and RX
The chip pinout is in the files section of the DPF group http://tech.groups.yahoo.com/group/D...delete%20tool/