We have recently had several Vauxhall Insignia's in for diesel particulate problems (DPF), all of which, apart from one, we have managed to resolve.

Does anyone actually know the exact engine management system's requirements that if not met, force the vehicle into "limp mode" due to a DPF fault and the message "service engine soon" to appear on the dashboard

What i am asking is how does the cars' ECU determine when a DPF regen' is required and if this is based solely on readings from the DPF pressure sensor. We suspect the ECU not only monitors DPF back pressure but also the DPF's temperature and distance travelled between regen's before the regeneration mode is activated.

Any help would be appreciated.

Regards Eddie Zyla.