Eolys?

[Paul-R]

What DPF fuel additive was it?

[GiveMeABreak]

Can it work to have diesel cleaner fluid injected/sprayed into the DPF through any of its sensor-openings (lambda/oxygen, temperature, pressure differential)?

No, never spray anything onto the sensors.

As I've mentioned - either take it to a place that specialises in cleaning DPFs or somewhere that can attempt an 'in-place' clean using a spray that is sprayed into the DPF at the separation part where the DPF and catalyst join.

[frer8833]

Is it easy to access and inject at the separation part DPF cleaner? What can happen if it is injected through the holes of a sensor?

Update 24 apr: I injected 2 cans of DPF cleaner through oxygen sensor hole (Brand: ProMeister) and cleaned with paper the sensor which had a lot of soot on it and with computer erased error codes and now it works. It's not in limp mode, no 'risk of dpf clogging' fault. There was a Service fault lamp and beep and also 'Top up engine oil' beep and fault on display. After topping up the car is normal again. Forced regeneration was not needed.

[Claudiugrigore]

Salut. Je possède une citroen c4 picasso, 1.6 bluehdi, 2018, et le message risque de colmatage dpf est apparu avec l'avertissement de service. le diagnostic a donné le code b1811 défaut permanent pompe à additif. le réservoir est plein d'additif. que puis-je faire pour réparer le défaut? Vin = VF7**************[VIN obfuscated, can be read by forum staff]

Google Translate:
Hi. I have a citroen c4 picasso, 1.6 bluehdi, 2018, and the risk of clogging dpf message appeared with the service warning. the diagnosis gave the code b1811 permanent fault additive pump. the tank is full of additive. what can I do to fix the fault? Vin = VF7**************[VIN obfuscated, can be read by forum staff]

[GiveMeABreak]

Hi

This code relates to an issue with the Eolys additive pump. If the pump is not operating correctly, then it won't be adding any Eolys fluid into the fuel tank whenever you add Diesel. If this happens to be the case and no fluid is being injected, then it means assisted regeneration won't work. Natural regeneration requires that the vehicle is driven for a longer journey in order for the exhaust gasses to reach about 550 °C instead of the 450 °C needed for assisted regeneration.

So if this is not happening, then the particle filter can't regenerate properly and this can lead to rapid clogging up or blocking of the particle filter.

So it really needs some confirmation as to whether the DPF additive pump is faulty. If it is, then it will likely need replacing and a diagnostic tool to prime the system. But it does need confirming that the pump is not operating using Diagbox to be honest as that should be able to test the pump.

[frer8833]

When Citroen C4 II (B7) Service lamp (not limp mode) is ON because of dieselparticulate filter (but DPF diod is OFF, it's not ON), is it then impossible to do a highway regeneration (is car's ECU preventing passive highway regeneration?), is the only way to regenerate by a forced regeneration by a mechanic's computer?

[GiveMeABreak]

The car's engine ECU has nothing to do with passive regeneration - passive regeneration takes place automatically (unassisted) when the conditions are suitable - i.e. you may be on a long journey and the exhaust gas temperatures are naturally very high. In this case the soot will burn off under the high temperatures automatically.

Assisted regeneration only kicks in when the filter is getting full and the type of driving / conditions don't allow for a passive regeneration.

The other type of regeneration is a 'forced' regeneration. This is done with a Diagnostic tool under certain conditions, but is not recommended because of the strain and toll on the engine components, as the vehicle is static and therefore there is no cooling of the engine bay or the vehicle. That's why you must be very careful where this is done, or it could cause fires because of the extremely high temperatures produced. The engine ECU can of course prevent forced regeneration under certain conditions or when certain fault codes are present for engine safety / damage reasons.

Your engine management light (depending which one it is (SERVICE or ENGINE Symbols) may have different meanings.

So back to your question no - the engine ECU has no control over passive regeneration as it is simply that - passive, with no intervention from the vehicle's systems.

[frer8833]

On a Citroen C4 II (B7) 2013 with Service lamp ON (not limp mode) because of dieselparticulate filter (but DPF diod is OFF, it's not ON) will the Service fault clear if the DPF is cleaned or will the car (ECU?) not understand that the DPF is cleaned (despite pressure differential has become good) until it is told by VCD (Lexia 3 etc) that the DPF is cleaned? Or is this requirement to tell the car that the DPF has been cleaned only required for older models of C4 (2008-9 and older)?

The Engine light is Off. Only yellow Service light is on.

[Hell Razor5543]

You will need to either clean or replaced the DPF and then tell the car that the filter has been replaced (even if it has been cleaned, as there is no option for THAT).

[frer8833]

I mean if it has been partially cleaned (by passive regeneration or otherwise; DPF-spray etc) and soot and ash level has decreased back to a normal level (not completely clean) can the car understand this and stop activating Service mode without having to tell this to the car with a VCD (Lexia etc)? (I guess the answer is yes on newer models after year 2009). If I drive it on highway and manage to partially clean it with passive regeneration, can it stop Service fault mode, or will Service mode be permanent when a threshold dirt-level has been reached until it is told with VCD that the DPF is new? It doesn't immediately Service beep when cold started after a few hours so I guess the car is actively evaluating the DPF's health and can by itself turn off the Service mode if the DPF has begun to seem ok (after passive regeneration etc)?

[GiveMeABreak]

Some points you need to understand:

1) Soot accumulates in the filter. The soot is burned off during regeneration and turns into ash.
2) Ash remains in the filter.
3) Cerine (a constituent of the Eolys fluid) cannot be burned off and remains in the filter walls.
4) It is therefore a combination of ash, Cerine and other engine deposits that will ultimately block the filter.

So when the filter becomes blocked with the above towards the end of its service life, and unable to regenerate, the filter will need removing and cleaning or replacing.
After this operation, you need to tell the Engine ECU that the Particle Filter has been replaced. This will stop the messages relating to the particle filter being blocked form appearing - assuming the filter has been cleaned or replaced.

[frer8833]

So when the filter becomes blocked with the above towards the end of its service life, and unable to regenerate, the filter will need removing and cleaning or replacing.
After this operation, you need to tell the Engine ECU that the Particle Filter has been replaced. This will stop the messages relating to the particle filter being blocked form appearing - assuming the filter has been cleaned or replaced.

The filter does not seem blocked (it should be able to regenerate; the ECU does not want to regenerate?), there is no 'risk of DPF clogging' fault, there is no engine light. There was some months ago 'risk of DPF clogging' when the Eolys pwrflx. fluid was empty together with limp mode but the Eolys pwrflx. (brand Walker) fluid has been refilled and the DPF cleaner has been injected, the DPF does not feel clogged, the car runs very good for some time before the error beep comes back; 'engine fault-repair needed + Service light; it still runs good with Service light on but not as powerfully; it is Service-mode I guess), so it should be able to regenerate? Or has the cars ECU decided to not anymore regenerate the DPF because it was some months ago in limp mode? The ECU will never forgive unless told with VCD that the DPF is cleaned or new? Is it caused by limp mode (means DPF was blocked?) or by 'risk of DPF clogging' or both together?

Another clue to what is the problem is that sometimes the Service beep happens when the key is ON but engine is not started. Also when driving and idling ECO flashes 3 times but never stays on. Does it mean the battery might be the problem?

[GiveMeABreak]

Separate Issues:

1) DPF Clogged = Message saying 'Particle Filter at Risk of Clogging' > means filter has had difficulty being regenerated - go for a brisk drive to allow a regeneration until message clears. If message does not go, filter probably needs cleaning or replacing = which means when this is cleaned or replaced, Engine ECU must be told filter has been replaced.

2) 'engine fault-repair needed + Service light' Can be something else, so needs a diagnostic to determine what the fault is.

[frer8833]

ECO works. But I don't know how to see soot/ash level or millibar back pressure from DPF differential pressure sensor. Does the car provide this info when the cooling fan has error and doesn't spin, in other words when car is in Service light mode? Can iCar Pro obd2 diagnostic tool read differential pressure sensor? I used Kingbolen Ediag Mini but did only see Oxygen sensor bank 1 and bank 2. The car has fantastic power before the Service light comes on. I think DPF is good actually.

[GiveMeABreak]

I can't help you with aftermarket diagnostic tools - but most decent scan tools will show the differential pressure sensor readings, which will have nothing to do with the cooling fan - it's an entirely separate system.