Hi Posters;

The car in the subject seems to perform the DPF regeneration process very frequently, i.e. at every 35 to 70 miles. The car has covered approx 50k miles with 80% at motorway speed.

Because of the very frequent regeneration of the DPF, the fuel economy has been severly affected. The car used to regenerate every 300 miles or so and gives around 65mpg, now drops to 55 to 60mpg.

The problem has been reported to the garage and the technican didn't find anything wrong with it as there was no fault code being logged in the ECU. My dilema is that Toyota Technical Service ageed that the the DPF need changing, but they said the fault need to be identified by the garage, but the garage doesn't seem to find any fault code being stored in the ECU. Note that the car is still under manufacturer warantee.

To be honest, I got a feeling that the filter has reached it's life.

Has anyone managed to get the dealer to diagnose and fix the problem? Or any other suggestion for sorting this problem out is appreciated.

Also does anyone know how the DPF regeneration logic work for the Toyota? I.e. will it go into limbo mode if the regeneration process is interrupted repeatedly (by switching off the enigne when regeneration starts)? I.e I am trying to exacurbate the problem.

Thanks,

Perfect.