Thanks Kev and Ian for your prompt responses.

Kev: When I visited the vehicle this afternoon, I did not have sight of the paperwork which the Dealer gave to the customer and he e.mailed me them this evening prior to posting this problem. It was then that I saw they had reset the DPF Sensor and then of course it occurred to me that maybe Autocom could do it. If I cant delete the DPF DTC's with new software and remap, I will reset the DPF Sensor and go from there. However, I don't want to see the vehicle back after a few weeks with the same problem.

Ian: With the paperwork sent this evening is a copy of TSB 2684 relating to Fault Code 2453 (5a) and basically it states as you have suggested. This has been complied with as far as I can see with the resets/updates etc and the fault has returned. I note from the TSB that the procedure should be carried out until the root cause can be determined. I am presuming at the moment the root cause is a faulty DPF and I suspect I am unwittingly following the same diagnostic path of the main dealer to ascertain the "root cause".

Thanks both again for your help.

Regards

Pete M