Morning All,

Once again, thanks for your interest and replies. Further background to this vehicle as follows: not sure if this is salient though.

Vehicle originally went into limp mode and diagnosed by main dealer as DPF blocked. They tried a forced regen but after a few minutes the ECU abandoned the procedure. Customer advised that a new DPF was required and due to the cost, decided to go down DPF removal route. I attended the vehicle and did the necessary re-programme. During the test drive the vehicle started to blue smoke heavily. After consultation with customer and my software engineer, it was decided that the ECU was still trying to perform a forced regeneration. Vehicle was returned to main dealer to have the counters reset. This cured the smoking and vehicle drove well. The car is used primarily for long journeys and after a journey of approx 250 miles the EML illuminated showing fault code P2452. Vehicle drove well but on occasion would drop into limp mode which would cancel when ignition was switched off/on. It was at this point I first posted the problem. The current state of play is that the customer was advised to have the DPF pressure sensor replaced on the theory that the internal diaphram was damaged when the DPF became blocked. He has been away for 2 weeks and due back later this week.

So, at the moment I am conducting research into this (with your help) but I am now minded to go back to my software guy and demand a few answers because I do not want my customer to spend unnecessary money on something which is not going to cure the problem.

Sorry for the long post, but I felt the need for the full story to be aired if it helps and to clarify the situation I am now in.

Phil... I am advised that the DPF will almost certainly become part of the MOT test in the next few years but will not become back-dated. So any DPF removal work undertaken now will not be subject to test.

Regards

Pete M

NB. As an after-thought I should mention that the blue smoking started after the forced re-gen. So it was there prior to me re-programming it. Incidently, they thought that the clouds of blue smoke was normal for that engine which is why a DPF has been fitted!