Greetings,

I would be grateful for your thoughts on this problem:

History: This vehicle is subject to very short journeys and about 6 weeks ago went into limp mode and was booked into the Main Dealer. This is a copy of what they did:

Carry out diag service vehicle soon on & vehicle in limp mode. Carried out tech 2 diag & found the DFP filter @ 95%. Checked boost system for leaks non found. Reset sensors using GDS tool. Carried out ECU software up date. Carried out DPF regen Cleared codes all now ok. Applied for car pass.

The fault code they found was P2453 (5a) and the sensor which was reset was the DPF sensor. Customer was advised to give the vehicle a blast on the local motorway once a week so it could regen naturally. Approx 3 weeks later, the same thing happened and booked into main dealer. Customer not sure what they did, but it drove fine afterwards.

The same thing happened again and I was asked to look at it with a view to delete DPF software and remap after removal of DPF filter internals. It may not be possible for me delete the software so I carried out a DTC check which showed the following: P2548 - Particulate Filter Regen time, PO674- Cylinder 4 Glow Plug, P2453 - DPF Diff pressure sensor, PO03A Turbo Boost Control Position not learned. All cleared down bar P2453 which stayed on whilst with the ignition on and stayed on whilst the engine running. Vehicle still in limp.

My questions are these: Could this just be a fault with the DPF pressure sensor or is the customer looking at a new DPF at £1350 if I cant delete the DPF software. The P2548 indicates to me that there was a problem with the regen time? Where is the DPF Pressure sensor sited? Finally, I failed to look to see if Autocom can reset the DPF Pressure sensor and may require Tech 2.

Sorry about the long post. Many thanks for your interest.

Regards

Pete M