Eolys Fluid

[Guest DaveW.]

Can anyone tell me if my C5 1.6HDI has to go to a Main dealer to have the eolys fluid checked and topped up? Likewise the particle filter. It says in the handbook this should be done at 75,000 miles and 62500 miles respectively.

[Johndouglas]

What year is your C5. C5's don't need to go to a main dealer for topping up - it's fairly easy to diy and eolys fluid can be bought now at GSF together with the kit. But then the ECU has to be reset otherwise false messages will be displayed. Regarding the FAP, some guys on the forums remove their filter and pressure wash it.

[Guest DaveW.]

What year is your C5. C5's don't need to go to a main dealer for topping up - it's fairly easy to diy and eolys fluid can be bought now at GSF together with the kit. But then the ECU has to be reset otherwise false messages will be displayed. Regarding the FAP, some guys on the forums remove their filter and pressure wash it.

Thanks John. My C5 is a 2007 57 63000 miles. Is it safe to continue running without changing or cleaning the filter and how do you know whether the fluid needs topping up? I presume the ECU can be reset by garages other than main dealers. p.s. I spoke to a main dealer today about this and they said their taxi driver clients were furious as to the cost of this work. Nobody warns you of the impending cost when you buy the car do they?

[Johndouglas]

At 63000 miles you should be OK for a while. The early cars needed refilling with eolys at around 50K. Later ones go much longer - 80 to 100K. You'll get a message on the centre display telling you that the additive is low. If you ignore the message, the filter won't burn off the soot and your engine will go into limp mode (It won't rev beyond 3000)

The ECU can be reset by anyone who has a Lexia. Several guys on FCForum have them. It only takes 10mins.

Particle filters are becomming universal on diesel engined cars. It's the price we have to pay for "saving the planet B)". Different makes of car use different systems but from what I've heard, the Citroen/Pug is much better than some.

It's possible without any adverse effect to have the particle filter taken out and the ECU rewritten so that all reference to the system is removed.

[Guest Bobster]

It's possible without any adverse effect to have the particle filter taken out and the ECU rewritten so that all reference to the system is removed.

 

 

Hi,

 

I have read on other discussion sites of C5s having their FAPs removed and then giving more power, more mpg and no problem with the MOT, but I have yet to read how this is achieved.

 

I read that if the FAP is removed, the ecu can be reset so that the FAP and Eolys systems do not run. When I asked about this at my dealer, they said it would have been possible with older Lexias but the new ones do not permit this.

 

If anyone can provide experience of this, I'm sure more than a few of us would be interested.

 

Best wishes,

 

Bob H.

[paul.h]

If you look on the technical posts, there is a recent one by ataxidriver64 on the subject of removing the filter and remapping the ecu.

[Johndouglas]

 

 

 

I read that if the FAP is removed, the ecu can be reset so that the FAP and Eolys systems do not run. When I asked about this at my dealer, they said it would have been possible with older Lexias but the new ones do not permit this.

 

 

Many workshops that do Chip-tuning' now offer the service. Put "FAP removal" into Google and you'll find plenty. DIY guys simply remove the box, knock out the filter and replace the box but at least one of the Google advertisers offer a replacement stainless steel pipe - at a price.

[jonnie45]

Hi

 

I am also the proud troubled owner of a C5 1.6 HDI made 2005.

 

I am looking at doing the eolys fluid myself but have a few questions....

 

John Douglas writes:

 

>>But then the ECU has to be reset otherwise false messages will be displayed.

 

My first question would be does the cease to inject eolys into the fuel tank if the ECU has not been reset. I am having joy and fun with my ECU at the moment but thats another story. The question is really - would the false messages just be an annoyance or is it pointless putting in the eolys fluid unless the ECU is reset, ie will eolys get to where it is needed regardless of the ECU not knowing that eolys has been recently added.

 

I am hoping my local guy can reset the ECU later on but since he is trying to resolve other ECU related issues there are good reasons for putting this on the back burner.

 

I suppose another way to put it is - is putting eolys in without an ECU reset a complete waste of time?

 

>>Regarding the FAP, some guys on the forums remove their filter and pressure wash it.

 

I have read elsewhere that real nasties get released into the environment if people do this I will leave it to people do their own research.

 

My second question is that there appear to be different grades of eolys, any suggestions on what grade is required for a C5 1.6 hdi 2005 manufactuer would be appreciated.

 

I am sad I have these ECU and now particulate filter system issues in my first year of ownership, when the car is behaving its a pleasure to drive - I am regretting going with diesel though - I prefer to do what maintenance I can myself and I am wondering whether I would have been better off with petrol.

 

As a non-petrol-head all I can say is "electric" - bring it on ! When the costs and battery reliability are comparable I will gladly say goodbye to carbon its just too much hassle and stress, the electric motors in my machining workshop have in some cases got 50 years heavy use on them and still running like well oiled clocks.

Edited August 16, 2016 by jonnie45

[paul.h]

Welcome to the forum.

 

Previous comments about FAP removal are no longer valid since a few years ago it became illegal and checks are made at the MOT to see if the FAP is still there, although they could miss one that still appears externally to be present.

 

People on here have said that provided there is eolys fluid in the tank, it will continue to be dosed, even if there are messages saying the level is low. The level is not measured but is a calculation based on the number of fuel tank fills and when the level is topped up, the ecu needs to be told how much has been put in, hence the need for the diagnostic to stop the warning messages.

 

The type of eolys fluid changed a few times but on the eolys tank there will be a coloured clip on a connector which shows which type it is. You could also check at a dealer using your car details (VIN, etc). If you do an advanced search on the forum on eolys fluid you may find the info - I have tried but my internet is very slow so I have given up.