DPF sensor pipes

My 2005 Volvo S40 2.0 diesel (136bhp) with 148,000 miles has gone into ‘limp-home’ mode. It has the fault code ‘P2002’, which relates to the DPF – which is possibly the original. I was planning to remove it and stick it in boiling water with lots of washing-up liquid, then reverse jet-wash it to remove some of the build-up. Is there a better way of cleaning it?

As I was removing the DPF, I saw that one of the rubber pressure sensor pipes had broken. I rang Volvo about a replacement and was quoted £115 for the two pipes. As they are straight and not preformed, I was hoping to make my own. What are these pipes made of and does anybody sell the material by the metre? Mark Hodges In answer to your first question, the best way to clean the DPF is performing a regen via the VIDA software, which will clean the DPF the way it was intended. Although DPF units for commercial vehicles are designed to be flushed, those used in passenger vehicles are not. Flushing them as you describe could result in damage.

However, as the sensor pipe is broken, the normal regeneration process will not be instigated because the sensor will not register the blocked DPF. The pipes are 6mm silicone heat- and pressure-resistant hoses. The exact formula is a Volvo secret, but I did manage to find a website – http://bit.ly/2nkfscf – advertising new pipes for £25 + P&P.

With the new pipes fitted, the DPF cleaning system should kick into action. Once the engine is up to temperature and running at speed, the regeneration should take place. The regeneration process normally takes around 20 minutes.