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How to Refill the DPF of the Citroen C4 Picasso with PatFluid Eolys

Model: Citroen C4 Picasso MK 2 - Years 2013-2022
Part: Diesel particulate filter

PatFluid Eolys is a catalyst liquid, essential for the proper functioning of the DPF system on many diesel cars; it lowers the combustion temperature of soot and mixes soot particles in the DPF: this way, the mix burns at much lower temperatures (450/500°C), temperatures that are reached much more easily even during city driving, triggering the automatic regeneration of the filter. When the additive level is low, the "pollution control system fault" warning light comes on the dashboard. This additive can be found on eBay with code 166413265998 for £64.95 + £26.33 for shipping from the UK. The procedure involves lifting the vehicle, removing the rear undertray, locating the metal tank. Connect the refill bottle, refill the tank while keeping the bottle elevated. Wear gloves, as the liquid is irritating and can permanently stain the ground where the operation takes place. Once finished, put everything back in place, but you must inform the ECU that the tank has been filled, using a diagnostic tool, accessing the maintenance menu of the DPF system, following the additive level reset procedure. In conclusion, the physical refill is within the reach of a hobbyist, but the final reset likely requires the intervention of a equipped workshop; not performing the reset nullifies the refilling operation.

Posted on 15 May 2026 by ScegliAuto

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