C5 X7 risk of particle filter clogging

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Re: C5 X7 risk of particle filter clogging

Post by RichardW »

GiveMeABreak wrote:The Adblue is completely separate and is injected into the catalyst - this process is known as the Selective Catalytic Reduction (SCR) and removes the harmful nitrogen oxide pollutants (NOx) by converting them into water and nitrogen. Once that is done, the exhaust matter travels through to the DPF for elimination of the entrapment and eventual burning of the particulate matter via regeneration.
Actually the DPF is first, then the SCR.... and AFAIK on E6 PSA systems with ad-blue they have done away with the Eolys DPF additive, so I'm unsure of how the regen works....
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Re: C5 X7 risk of particle filter clogging

Post by Paul-R »

I think that the Eolys is still used for the DPF on Euro 6 engines. I'm taking the 308 in for service on Friday - I'll ask then.
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Re: C5 X7 risk of particle filter clogging

Post by GiveMeABreak »

RichardW wrote:
GiveMeABreak wrote:The Adblue is completely separate and is injected into the catalyst - this process is known as the Selective Catalytic Reduction (SCR) and removes the harmful nitrogen oxide pollutants (NOx) by converting them into water and nitrogen. Once that is done, the exhaust matter travels through to the DPF for elimination of the entrapment and eventual burning of the particulate matter via regeneration.
Actually the DPF is first, then the SCR.... and AFAIK on E6 PSA systems with ad-blue they have done away with the Eolys DPF additive, so I'm unsure of how the regen works....
That's not how it works on the Blue HDi / PSA systems Richard:
1) Oxidation Catalyst
2) SCR
3) DPF

AFAIK the additive system is very much still in operation on the newer engines as the particulate matter still needs to be burnt off - the SCR just deals with the NOx.

All explained here:


Introduced from 2013 and still being implemented in 2016 on the Blue HDi.
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Re: C5 X7 risk of particle filter clogging

Post by Paul-R »

Paul-R wrote:I think that the Eolys is still used for the DPF on Euro 6 engines. I'm taking the 308 in for service on Friday - I'll ask then.
Would you believe I forgot to ask about the Eolys directly! I mentioned it as part of a general conversation and they didn't put me right so I assume it's still used.

Now here's something that caught me out with the AdBlue. I topped this up this week (6 litres) to make sure that they didn't need to bill me for any. When I got the bill there was an item for 17 litres of AdBlue. I queried this and was told that they have no way to measure how much is there (no dipping stick then!) and they have a vacuum removal machine which evacuates all remaining AdBlue liquid and then they completely replenish the container with 17l of AdBlue so that they can be sure of filling it up completely.

As you can imagine I was less than pleased about this and said I wished I had known about this as I had wasted all the AdBlue I had put. They said that this was an unusual situation and that If I had the car serviced with them again they would put the next charge of AdBlue in for free. If I do have them do the next service I'll make sure that I suck the damn container dry before I take it along!

On the other hand the AdBlue is very cheap from them 17l cost £13.06, which is cheaper than I've seen almost anywhere else.
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Re: C5 X7 risk of particle filter clogging

Post by Stickyfinger »

Longest £12 winge for ages :)

good point however :)
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Re: C5 X7 risk of particle filter clogging

Post by GiveMeABreak »

I've already checked this out on a C5 (X7) 2.0 HDi 150 PEF (DW10FD) Manual gearbox 6 with stop and start (Blue HDi) Year 2015 and can confirm it has a PEF (Particle Emissions Filter) tank as shown below, part 1500 NK. This is in addition to the Adblue as I've said.
Citroen X7 Blue HDI PEF Tank.jpg
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Re: C5 X7 risk of particle filter clogging

Post by Stickyfinger »

??, has the capability of the \PSA system increased so is still a better performing system than the other manufactures ?
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Re: C5 X7 risk of particle filter clogging

Post by GiveMeABreak »

Stickyfinger wrote:??, has the capability of the \PSA system increased so is still a better performing system than the other manufactures ?
? Not sure what you mean Alasdair - part of the debate was whether the newer blue HDi engines which use the UREA (Adblue) to get rid of the NOx using SCR also have the diesel additive for the particulate filter. And they do, so an improvement over the older system for sure. Can't say whether it is better than other manufacturers' systems that also use Adblue - some of those don't have additive systems for their DPFs and they clog more it would seem.
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Re: C5 X7 risk of particle filter clogging

Post by RichardW »

I stand corrected.... I was sure I had looked at service.citroen and seen them the other way around; and couldn't find the Eolys reservoir; but there they are.... :oops: :lol:
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Re: C5 X7 risk of particle filter clogging

Post by Paul-R »

Stickyfinger wrote:Longest £12 winge for ages :)
I'll take that as a badge of honour! :rofl2:
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Re: C5 X7 risk of particle filter clogging

Post by citroenc5mad »

Sorry guys should off updated earlier.
After I had the garage inspect and check all sensors they came back with no abnormalities.
So I had a forced regeneration done. This so far has cured the problem and I have covered 2-3000 miles since.

I think the fault was my own doing those. As was using the cheapest fuel I could get and running it so the light came on so sacking all the rubbish from the fuel tank. I done this for a few weeks while money was a bit tight. So just a warning to anyone else doing this.

And thanks for all the replies to this post
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Re: C5 X7 risk of particle filter clogging

Post by GiveMeABreak »

Thanks for the update - short journeys will have also contributed to the problem - but really glad you are back up and running with it. :-D
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Re: C5 X7 risk of particle filter clogging

Post by Harlequin »

Will add - when I did a forced regen on my C5, it tells you what its going to do - 4000rpm for xxx amount of time , then 2000 rpm for xxx amount of time - and stand very clear of the back end!
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Re: C5 X7 risk of particle filter clogging

Post by GiveMeABreak »

Yes, I've seen one firing off - engage Nuclear fallout suit, gas mask and loose your Jesus Boots for the duration!
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Re: C5 X7 risk of particle filter clogging

Post by citroenc5mad »

Journey time I'm driving 50 mins-1hr a day 5days a week too work at a constant 65/70mph so I don't think this was part off the issue. The only thing I done different was running it so the fuel light would come on and then putting fuel in.
It was trouble free until I started running too the light comes on.
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