Eolys?

[frer8833]

210 000 km

[Paul-R]

That's certainly about the time that a FAP might need replacing or deep cleaning. The Eolys level should also be checked as part of procedure.

You haven't mentioned, I think, whether you have used a diagnostic machine (preferably Diagbox) to investigate the engine ECU as this will need resetting if either, or both, the Eolys or FAP have been serviced.

[frer8833]

This is the first time it needed DPF-fluid refill.

A repair shop refilled the fluid and probably resetted the codes because it went out of limp mode and stopped beeping 'low additive'. 'Risk of filter clogging' was still beepig though.

Can the car get out of limp mode by forced or active regeneration or does limp mode have to be cleared with Diagbox? Does car stop injecting Eolys Powerflex in limp mode even when DPF-regen-tank is full?

[GiveMeABreak]

Yes, these are separate issues. Filter clogging and Additive levels.

If you have tried a long drive and the 'Risk of Clogging' message has not gone, then you really need to have the filter cleaned out, as I explained, it may be too late for regeneration to take place if the filter is too full.

There are some places that offer an 'in-place' DPF cleaning option, where they inject a solution into the DPF while it is up on a post lift. This can break up deposits and remove some of the blockage. Success depends on how badly blocked it is. The better solution is to have it removed and properly cleaned (or replaced) by a proper place that does this regularly.

The limp mode cannot be cleared because of safety and damage to the engine until the filter is unblocked.

Additive is only injected into the fuel tank when Diesel is added to the tank.

[Paul-R]

This is the first time it needed DPF-fluid refill.

Have you owned the vehicle since new? Could a previous owner have refilled the Eolys? If you're not the first owner, what mileage was the vehicle when you got it?

A repair shop refilled the fluid and probably resetted the codes because it went out of limp mode and stopped beeping 'low additive'. 'Risk of filter clogging' was still beepig though.

The 'Risk of filter clogging' message is to do with the FAP, not the need for a refill of Eolys. You may have refilled the Eolys unnecessarily if it has been filled earlier in its life. I'll have to accept that the garage reset the engine ECU properly. Of course, if the ECU had been reset earlier then it may have been still valid.

Can the car get out of limp mode by forced or active regeneration or does limp mode have to be cleared with Diagbox? Does car stop injecting Eolys Powerflex in limp mode even when DPF-regen-tank is full?

As far as I am aware, limp mode has nothing to do with injection of the Eolys. The Eolys is injected into the fuel tank after you've put fuel into the tank. Once it's in it's in. It's not a continuous process.

[frer8833]

Is it neccessary to actually fill more diesel in the tank to activate Eolys injection from DPF tank or is it enough to just open and close the fuel tank lid (or put dieselfiller nozzle inside the car's tank)? Is it also neccessary to start up the car afterwards or does it inject with ignition turned off?

Maybe I should have filled diesel, which I haven't yet, in the car after the repair shop had filled Eolys in DPF tank in order to avoid limp mode? I assumed the repair shop had already caused Eolys to become injected into the dieseltank but maybe there is still no injected Eolys in the diesel tank because I haven't topped up with diesel after the repair shop refilled Eolys.

Update: I filled small amounts of diesel five times and started up the car each time hoping eolys would be injected five times too, and I added DPF-cleaner fluid to the tank and drove on high way during 25 min but fault "risk of clogging DPF filter' is still on. I've booked an appointment for Forced DPF-regeneration It's cheaper than having the filter removed and cleaned.

[Paul-R]

I believe that early cars simply relied on a sensor that registered when the fuel filler cap had been opened and squirted a predetermined amount of Eolys into the fuel tank. Obviously if you only put £10 worth of fuel in at a time you'll quickly exhaust the Eolys reservoir.

Later cars actually monitor the fuel level reading and if there's a sudden difference between the last measurement before switching the ignition off and then back on (after filling up with diesel) then it will inject an amount of Eolys calculated to match the amount of fuel put in. The fuel has to be at least 10l otherwise it doesn't register.

[Paul-R]

I've booked an appointment for Forced DPF-regeneration It's cheaper than having the filter removed and cleaned.

They are not alternatives. If the DPF/FAP is clogged with spent ash and otherwise unburnable material then it'll have very little effect. A forced regen will only work if the FAP is clogged with soot particles.

[GiveMeABreak]

Is it neccessary to actually fill more diesel in the tank to activate Eolys injection from DPF tank or is it enough to just open and close the fuel tank lid (or put dieselfiller nozzle inside the car's tank)? Is it also neccessary to start up the car afterwards or does it inject with ignition turned off?

No! Please forget all this talk of adding additive into the fuel tank. Your issue is the DPF blocking. The additive is automatically dispensed and metered out, depending on the quantity of diesel added. This is not going to sort the DPF blockage out, because the drive along the motorway you had would most likely have triggered 'natural' regeneration as the exhaust gas temperature should of been about 550 °C.

Maybe I should have filled diesel, which I haven't yet, in the car after the repair shop had filled Eolys in DPF tank in order to avoid limp mode? I assumed the repair shop had already caused Eolys to become injected into the dieseltank but maybe there is still no injected Eolys in the diesel tank because I haven't topped up with diesel after the repair shop refilled Eolys.

The garage as part of the additive topping up procedure would have primed the additive pump.

Don't forget only a very tiny amount of additive is dispensed, which is why it lasts so long.[/quote]

Update: I filled small amounts of diesel five times and started up the car each time hoping eolys would be injected five times too, and I added DPF-cleaner fluid to the tank and drove on high way during 25 min but fault "risk of clogging DPF filter' is still on. I've booked an appointment for Forced DPF-regeneration It's cheaper than having the filter removed and cleaned.

No! This is not how it works. The engine ECU calculates how much diesel is in the tank when the ignition is switched off. It may detect if the fuel cap is opened or not. However, when the engine is next started it undertakes calculations to determine if any diesel is added and how much. It will then determine if it is necessary to add any additive for the diesel added. It does not therefore mean that additive is injected into the fuel tank every time - but more on the quantity of diesel added.

[GiveMeABreak]

They are not alternatives. If the DPF/FAP is clogged with spent ash and otherwise unburnable material then it'll have very little effect. A forced regen will only work if the FAP is clogged with soot particles.

It will not always be possible to force regeneration

If you have Diagbox then you can force a regeneration as long as it has not been disabled by the engine management ECU in order to protect the engine.

If the message does not clear, then your filter may indeed be past the ability to regenerate if it is too full. When it gets to anything over 70% regeneration may not work, and the filter will need deep cleaning / replacing.

Certain fault codes can also prohibit forced regeneration.

[Paul-R]

They are not alternatives. If the DPF/FAP is clogged with spent ash and otherwise unburnable material then it'll have very little effect. A forced regen will only work if the FAP is clogged with soot particles.

It will not always be possible to force regeneration.

True but the important point I was trying to make is that they are not alternatives.

Perhaps a better phrase than "A forced regen will only work if the FAP is clogged with soot particles." would have been to say "A forced regen will only work if the FAP is filled with soot particles rather than ash."

[RichardW]

You need to get the codes read.... It's quite likely that it's decided the filter is end of life (but it probably isn't) - this doesn't usually cause limp mode however.

[frer8833]

The engine light is on. I assumed it is on because DPF-filter light is on. Why is it in limp mode if dirty DPF doesn't usually cause limp mode?
Edit: There is also ESP/ASR fault and Traction Control is off.
I will skip Forced regeneration and let a mechanic remove and clean the dieselparticlefilter.

[GiveMeABreak]

The vehicle will go into reduced performance mode if there are certain conditions regarding the DPF and associated systems - see below for details:

The appearance of certain faults in the particle filtration system leads to the illumination of the engine diagnostic LED.

The particle filter failure warning light comes on if there is a fault in the following components or information:

• Differential pressure sensor
• Exhaust gas temperature sensors (downstream of the catalytic converter)
• Holed particle filter

When the particle filter is clogged, the particle filter clogged warning light is switched on on the instrument panel.

Back-up operating modes
The injection system manages the following back-up modes: An operating mode with a reduced fuel flow.

Reduced fuel flow
This back-up operating mode limits fuel flow, and the engine speed cannot under any circumstances exceed 2750 rpm.
The injection system switches to "reduced flow" mode when a fault is present on one of the following components:

• Clogged particle filter
• Differential pressure sensor

[frer8833]

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