You can remove it & jet it out with a high pressure jetwash .

That is total nonsense. A DPF is not a simple device, its a matrix of material that the soot particles stick to. Jet washing does not remove them. To remove the particles once they are stuck to the matrix a temp of 600 degrees is required, that is why extra diesel is injected in during a regen. But a regen is not happeneing all the time, it varies frommake to make but unless a regen is happeneing there is no extra diesel injevcted thus it does not affect your fuel consumption.

Seen it quoted before that each regen takes about 0.1 gallons of fuel. Do a regen every 300 miles overe 10,000 miles that is just over 3 gallons. OK its a waste of diesel but at 50mpg over 10,000 miles you are using 200 gallons anyway, another 3 gallons is only 1.5% extra fuel.

Think about it, if it was that simple would garages alll over the country not be offering this simple service. Add to the the soot is toxic, how are you going to dispose of the water when its contaminated.

Don't forget that the DPF is there for a reason. Soot particles are carcenogenic, do you want to be responsible for risking peoples future health.

" That is total nonsense. "

Sorry, but you are wrong.

This was one of the first cars to be fitted with a DPF or FAP as PSA called it then. It relies on Eolys fluid to help it regenerate. When a DPF regenerates it leaves behind ash residue & this is what is being washed out. It was a service item on these cars & required cleaning every 50k. PSA dealers in this country found it easier & more proffitable to replace them with a service exchange unit, then return the clogged up unit back to a central depot in France for cleaning. But if you want to avoid excessive costs you can jet it out yourself. Technology has moved on & DPF's are now efficient & mostly last the life of the car.

I don't know if you can trick the system Peter. There are 2 pressure sensor pipes fore & aft of the combined CAT/FAP together with 2 temperature sensors. The pressure pipes go back to a pressure differential sensor mounted on the bulkhead. & assume the temp sensors go back to the ECU. If you want to experriment you'll have to get hold of an old FAP & gut it out. I'd had Citroen diesels for the previous 20 years but decided to move over to VW after the C5 to avoid the DPF.

Best of luck with it.

Would I be correct in assuming that not all 2.2hdi in the Citroen stable had a FAP system I had a 53 plate which did not and a 54 plate which did.As these cars were new at the time nobody had messed with them,the same engine fitted to the 407 did have a FAP fitted I had a 54 407 sw 1.6hdi which did 120k with absolutely no bother exept a faulty FAP filler cap which throw a alarm on the dashboard .

Definitely seen plenty of 406s without FAP and have checked my early 2.2hdi Citroen did not have a FAP system. I seem to remember it was a big advertising campaign on the 407 with somebody breathing the exhaust fumes because they were so pure.

Edited by Collos25 on 21/01/2013 at 12:30

Removal of the DPF is not illegal as it is not a requirement of the MOT but not telling the DVLA and applying for a new log book with the relevent outputs is.

You must also inform your insurance company as it comes under major changes and modifcations and it is illegal to use the car in the rest of the EU and if you sell it you must inform the buyer of the work carried out and give him the new logbook.

These units are fitted for a reason and the reason is illness and early death caused by fumes from diesel engines.

See this simple fix, (for a Volvo) on youTube. It is something I will consider if I keep my Volvo at the end of its lease, (around 100k miles).

www.youtube.com/watch?v=QMf4m946aKA

Q.