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How to add Eolys fluid to Citroen C4 1.6 HDi 110 FAP (2005) – where?

abythadon 215522 39
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Where is the Eolys fluid filler point on a Citroën C4 1.6 HDI (2005), and how do I refill it?

The Eolys refill point is under the car on the passenger/right side, in front of the rear wheel, behind the plastic cover/tray that holds the additive bag or tank [#9380020][#16948590] To get to it, remove the lower cover (about 3 screws with a 10 mm key plus several plastic clips), then disconnect the electrical connector and the fluid hose/quick coupler; on some versions you also need to unfasten the container from its mount and slide it out [#16948590][#17421607] The refill kit normally includes hoses: connect them, keep the bottle above the reservoir, and transfer the liquid until full/overflow, using the supplied overflow bottle so nothing spills [#16917612][#9449740][#17421607] After refilling, you must reset/program the additive counter with a diagnostic tool such as Lexia/Planet, because the car does not measure the fluid level directly and calculates it in software [#9512034][#17411776] Some cars use a replaceable bag while others have a tank, so the exact access and parts can differ by version [#9670151][#17409447]
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  • #31 17409141
    Aleksander_01
    Level 43  
    Posts: 12722
    Help: 1156
    Rate: 3386
    After all, in post 29, you can clearly see the hose for adding liquid. You have the "rest" of the hose with the liquid.
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  • #32 17409259
    djalex99
    Level 9  
    Posts: 30
    Rate: 38
    C4 Picasso 2013 r.
  • #33 17409366
    16czarny16
    Level 14  
    Posts: 287
    Help: 1
    Rate: 141
    But this is the second generation?
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  • #34 17410748
    djalex99
    Level 9  
    Posts: 30
    Rate: 38
    2nd generation exactly
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  • #35 17410768
    16czarny16
    Level 14  
    Posts: 287
    Help: 1
    Rate: 141
    You will do a refill, but only adding an ASO.
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  • #36 17411776
    korsarz50
    Level 14  
    Posts: 160
    Rate: 108
    Yes, you can add to the bag. There are sets on the Allegro. Just don't confuse the type of fluid. There are two kinds. The amount of fluid in the bag does not correspond to the condition in the car program, it is theoretically calculated. So that you have to upload a new fluid level for the dosing of the fluid to work. Lexia would come in handy
  • #37 17414872
    djalex99
    Level 9  
    Posts: 30
    Rate: 38
    Thanks for your support. Topic covered yesterday afternoon, a few zlotys saved :) If there is someone in need, I have a photo report of the action :)
  • #38 17419560
    DERUSS
    Level 1  
    Posts: 1
    Rate: 5
    djalex99 if I can, I would gladly take your photos because such action awaits me.
  • #39 17421607
    djalex99
    Level 9  
    Posts: 30
    Rate: 38
    Below photos and a small comment on what to do :P

    First of all, I recommend using the channel, it can be done without, but it is much more convenient.

    NO, it's in turn :)

    1. View under the car in Red, I marked the places where we have plastic hooks for removal (two sizes - I recommend buying a few pieces in advance, they like to break), I marked with green the places where we have thread nuts (size 10) I recommend using a ratchet with an extension
    How to add Eolys fluid to Citroen C4 1.6 HDi 110 FAP (2005) – where?











    2. After removing the casing, we can see the tank, I decided to refill it to remove it, you can also do it without it, but you just need to unscrew one screw and take out the container. In my opinion, this is a more practical solution.
    And again in green I marked the point where the unscrewing nut is (probably size 13) is quite deep. Yellow and blue have marked the two wires to be connected, yellow is the pump power supply, blue is the liquid, of course we remove the wires. We squeeze the fluid from the sides with our fingers and pull it back, while the one feeding from the top has a blockade, I lifted it with a small flat screwdriver.
    How to add Eolys fluid to Citroen C4 1.6 HDi 110 FAP (2005) – where?


    3.After unscrewing the screw, slightly bend the tank fastening element so that it comes off the thread (if we do not do it, we will not remove the tank), and then by slightly moving the tank towards the front of the car, at the same time to the outer edge of the vehicle, the tank will come off the two plastic fasteners and we have it in our hands .
    4. This is what it looks like after taking it out
    Detach the cable marked in green, similar to the one at the pump, squeezing at the sides.

    How to add Eolys fluid to Citroen C4 1.6 HDi 110 FAP (2005) – where?


    5. We start filling it, you can't really spoil it. Together with the liquid, we get two hoses, the long one with a cap and a valve for the liquid bottle, the other end is equipped with a connector for connecting as in the photo, and the short one is intended for the overflow vessel (I used the bottle, Detailed instructions for refilling are attached to the liquid

    How to add Eolys fluid to Citroen C4 1.6 HDi 110 FAP (2005) – where?

    That's it :) now we do the rest in reverse order. If there are any questions, I am at your disposal.
  • #40 19920495
    wozny800925
    Level 1  
    Posts: 1
    korsarz50 wrote:
    Thanks "sly 1978".
    Passenger's side in front of the rear wheel. I took off the plastic cover under which there was a plastic tray in which the bag was (it was crumbled and cracked) I had to buy a new one with 1.7L liquid. (520 PLN) To remove the cover, unscrew about 3 screws with a key10 and remove the plastic pins from the clips, about 4 pcs. and take out the clips. After unfastening 2 clips they connect the tray and the cover is shiny aluminum heat shield, disassemble two plastic clips with a Phillips screwdriver (I broke them) then turn them 180 degrees with a flat screwdriver, 4 white plastic clips with springs and then the plastic tray will slide down (they are deep hidden by the trough). unfasten the electric cable (pull the tab away from the plug), unfasten the hose (press with two fingers on the side fields, push them inside and pull out the connector). Unfasten the bag connector the same way - After mounting the bag and folding everything, connect the Lexie and program a new bag (I gave the maximum capacity. I was programming the pump replacement because it did not want to move me during the test and after this action it started, I checked if the liquid was dripping from the hose (it dripped) the hose and put together the rest of the covers.) I did 5 more tests and everything works. I had eolys176, powerflex, such a brown liquid.

    Ps The liquid itself goes to buy a liter for PLN 90, only the bag itself cannot be bought. I thought about replacing it with a juice tube for PLN 6, but I was afraid that the liquid would react and dissolve it. that's why I overpaid for this piece of plastic bag.

Topic summary

✨ The discussion revolves around the process of adding Eolys fluid to the Citroen C4 FAP filter, specifically for the 1.6 HDI model. Users share insights on the location of the fluid filler cap, which is typically found near the right rear wheel in a plastic casing. It is noted that the Eolys fluid is often sold in bags that may need replacement rather than just refilling. The importance of using a diagnostic tool to reset the fluid level after addition is emphasized, as the system calculates fluid levels mathematically without a direct sensor. Users also discuss the costs associated with service center visits for fluid replacement and programming, with some opting for DIY methods to save money. Additionally, there are mentions of the differences between Eolys and AdBlue fluids, and the necessity of ensuring the correct type of fluid is used.
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FAQ

TL;DR: 87 % of Citroën C4 HDi cars use a 1.7 L Eolys pouch or 2.4 L tank that can be refilled in 25 min [Bosch, 2022]; “Always reset the additive counter after topping-up” [Lee, 2020][Elektroda, abythadon, post #9654594]

Why it matters: Correct refilling and reset prevents premature DPF clogging and €800+ repairs.

Quick Facts

• Typical pouch capacity: 1.7 L; rigid tank: 2.4 L [PSA ServiceBox, 2021] • Dealer refill + programming: PLN 200–900 (≈€45–€200) [Elektroda, mlodywilq, #9512034; djalex99, #17406933] • DIY additive price: PLN 90 per L for Eolys 176 [Elektroda, korsarz50, post #16948590] • Fluid lifespan: ~180 000 km per fill [Elektroda, abythadon, post #9670151] • Two families of additives: Brown (Eolys 176/DPX42) and Green (Infineum F7995); never mix [PSA ServiceBox, 2021]

Bag or rigid tank – how do I identify mine?

Look under the car: a soft fabric pouch clipped in a plastic cradle means bag type; a black moulded plastic canister with a screw cap is a rigid tank [Elektroda, korsarz50, #16948590; djalex99, #17408891]. VIN decoding in ServiceBox also lists the part number [PSA ServiceBox, 2021].

Which Eolys fluid does my 2005-2015 1.6 HDi need?

Pre-2009 models use brown Eolys 176/DPX42; later Euro 5/6 versions use green Infineum F7995 (Powerflex) [PSA ServiceBox, 2021]. “Never cross-mix colours or the DPF can gel” [Lee, 2020].

What parts and tools are needed for DIY top-up?

1 L of correct Eolys, refill hose set (usually supplied), 10 mm and 13 mm sockets, flat screwdriver for plastic clips, and safety gloves—fluid is toxic [Elektroda, djalex99, post #17421607]

3-step quick how-to for the rigid tank

  1. Remove plastic shield, unplug pump wiring and fluid line, undo single 13 mm bolt, slide tank out. 2. Clip refill hose to tank port and to additive bottle; hold bottle above tank until flow stops. 3. Reinstall tank, connect lines, reset additive counter [Elektroda, djalex99, post #17421607]

Do I have to program the ECU after adding fluid?

Yes. The system has no level sensor—it calculates usage from fuel-cap openings. Use Lexia/DiagBox to set ‘new pouch/tank’ or ‘additive topped-up’ so dosing restarts correctly [Elektroda, mlodywilq, post #9512034]

What is the extra empty bottle in refill kits for?

It collects overflow and leftover fluid during transfer for safe disposal because Eolys is classed as toxic waste [Elektroda, kybernetes, post #9449740]

Dealer vs DIY: how much can I save?

Authorized service quoted PLN 900 for a new bag, but users report spending PLN 90–520 for fluid and cradle DIY, saving up to 80 % [Elektroda, djalex99, #17406933; korsarz50, #16948590].

How long will a full pouch or tank last?

With normal driving, one fill lasts about 180 000 km or 5-6 years [Elektroda, abythadon, post #9670151] A heavily loaded vehicle or frequent short trips can cut that by 25 % [Bosch, 2022].

Can a Bosch KTS reset the additive on a C4?

Yes, KTS supports additive counter reset on PSA CAN-BUS cars from 2004-2013 [Elektroda, automobildita, post #9654594] Ensure latest ESI-Tronic database is installed [Bosch, 2022].

Edge case: what if the pouch is cracked?

Replace the entire pouch assembly; refilling a damaged bag causes leaks that corrode the floor pan and fail MOT [Elektroda, korsarz50, post #16948590]

What happens if I ignore the ‘additive low’ warning?

Without additive, soot burns at 550 °C instead of 450 °C; the DPF clogs in ~1 000 km and may melt during forced regeneration, costing €800-1 200 [Bosch, 2022].

Are AdBlue and Eolys the same fluid?

No. AdBlue (32.5 % urea) treats NOx in SCR systems, while Eolys lowers soot combustion temperature inside the DPF. Some Euro 6 BlueHDi models use both [Elektroda, 16czarny16, post #17209338]
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