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Peugeot Citroen - Supplement AdBlue in the PSA group control UREA

glapsson 464886 189
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Usually you need to vent the AdBlue tank by unscrewing the filler cap, then clear/reset the AdBlue errors in DiagBox/Lexia; several users report that a defective cap can prevent the system from seeing the refill [#18016057][#18266726] If the warning comes back after a short drive, the refill itself is not the real fault — the thread points to low pressure, pump/tank controller issues, a bad pressure sensor, injector problems, or wiring/contacts [#19019093][#19480902] In a few cases, the fix was not a whole tank replacement but repair of the tank electronics/controller or varistor, with one Warsaw service repairing it for about PLN 1,000–1,500 instead of replacing the complete tank [#19080727][#19165279] Other users did have to replace the complete tank, but even then some reported that only certain parts of the module were actually faulty [#18016057][#19480902]
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  • #181 21297632
    ziomexxsan12
    Level 6  
    Posts: 111
    Rate: 26
    >>21297513 .

    It is best to check the errors first. On the 1.5 engine a very common error is the P20EE error, in case of this call me, I deal with the entire exhaust aftertreatment system and also regenerate the pumps in the AdBlue tanks
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  • #182 21336112
    janmari
    Level 2  
    Posts: 2
    Rate: 1
    >>21297632 .
    I also have error P20EE:00 Peugeot 308 2.0 BlueHDi. In which city can you make an appointment for a diagnosis? I am from Warsaw.
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  • #183 21368075
    robert_m
    Level 12  
    Posts: 30
    Rate: 12
    Hi. Could the P2635 error be related to the AdBlue pump? Thank you.
  • #184 21412571
    sonyericson2004
    Level 1  
    Posts: 1
    Hello
    DS5 problem check engine, exhaust system and a light you know what....
    Does anyone have a contact Warsaw and surrounding areas to sort this out?
    I've driven the car 4,000 km so I have no idea what the problem is, 100,000 on the tank.
    Is it a lack of AdBlue or is it the other fluid, I have no idea if two go in.
    20 HDi 180 km
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  • #185 21417845
    janmari
    Level 2  
    Posts: 2
    Rate: 1
    >>21412571 Warsaw, Mechaników 8
  • #186 21424045
    seattmm
    Level 9  
    Posts: 13
    >>18469135
    fault not pressure sensor, fault in pump

    Added after 1 [minutes]:

    >>21368075
    AdBlue pump fault P20E8

    Added after 2 [minutes]:

    janmari wrote:
    >>21297632 .
    I also have error P20EE:00 Peugeot 308 2.0 BlueHDi. In which city can you make an appointment for a diagnosis? I am from Warsaw.


    Not affected AdBlue system Try do DPF regeneration
  • #187 21442723
    robert_m
    Level 12  
    Posts: 30
    Rate: 12
    Cleaning the injector itself in the washer also helps.
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  • #188 21554857
    artur.heise
    Level 33  
    Posts: 1637
    Help: 226
    Rate: 614
    robert_m wrote:
    Cleaning the injector itself in the washer also helps.


    Provided it is not collapsed at the amen. :)

    Added after 2 [minutes]:

    robert_m wrote:
    Hello.Could the P2635 error be related to the adblue pump? Thank you.
    .

    Not likely, it's not the pump.


    A table with information about error code P2635 00 in the DELPHI DCM 6.2 engine controller, related to the fuel pump and possible malfunctions.
    Helpful post? Buy me a coffee.

  • Injector cleaning with syringe, hot water, and 12 V

    #189 21613566
    piotrek60551
    Level 6  
    Posts: 3
    Rate: 1
    Removing the check engine will do nothing without resetting the Denox system, and this function is not in every diagnostic program. Once the engine has started, the pump must have a constant pressure of about 4 bar, if I remember correctly. The injector is a simple solenoid valve that lets the pressure out momentarily. Once the system has been pressurised, so that the pump does not grind air, it is sometimes necessary to blow lightly on the AdBlue filler cap while the pump is running, despite such a function in the computer. The error, the momentary drop in performance etc. appears in all with Euro 6 exhaust standards, whether Audi, Porsche etc.

    Added after 2 [minutes]: .

    Removing the check engine will do nothing without resetting the Denox system, and this function is not in every diagnostic program. Once the engine has started, the pump must be at a constant pressure of about 4 bar, if I remember correctly. The injector is a simple solenoid valve that lets the pressure out momentarily. Once the system has been pressurised, so that the pump does not grind air, it is sometimes necessary to blow lightly on the AdBlue filler cap while the pump is running, despite such a function in the computer. The error, the momentary drop in performance etc. appears in all with Euro 6 exhaust standards, whether Audi, Porsche etc.

    Added after 6 [minutes]: .

    >>21442723 .
    All you need is a removed injector a syringe hot water and current12v

  • Specialist AdBlue tank repair avoided replacement

    #190 21931629
    karolinaodrzywolek20
    Level 2  
    Posts: 2
    I was convinced I’d need a new tank. Fortunately, I ended up at BlueFix and it turned out that not everything the authorised service centre shows necessarily means a replacement costing 7,000 zł. They repaired my tank and it worked out much cheaper. So, before anyone spends a few thousand zlotys or decides to switch off the AdBlue system, I’d recommend consulting someone who specialises exclusively in this system first.
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Topic summary

LABEL_AI_GENERATED
Discussion about PSA group AdBlue/UREA faults in Peugeot and Citroën diesel cars, mainly BlueHDi/SCR systems. The recurring symptom is the UREA lamp, engine fault message, countdown to immobilization, and errors such as P20E8, P20F6, P20EE, P2200, P2202, P15B3 and NOx-related faults. Users report that simply topping up AdBlue often does not clear the warning unless the refill is entered in DiagBox/Lexia and the cap is vented or replaced. Common causes identified include low AdBlue pressure, leaking or crystallized pipes, blocked injector, faulty pressure sensor, damaged pump integrated in the tank, defective tank electronics/controller, and NOx sensor failure. Several cases were solved by replacing the cap, injector, sensor, controller, or the entire tank; others were repaired more cheaply by specialist workshops. Tunap 986 additive was tested by some users to reduce crystallization and temporarily restore normal operation. There is also repeated discussion of disabling SCR/AdBlue electronically, but most technical advice focuses on diagnosis with DiagBox, pressure testing, leak checks, and component replacement.
AI summary based on the discussion. May contain errors.

FAQ LABEL_AI_GENERATED

TL;DR: Up to 90 % of PSA SCR faults stem from “pump or cap issues”[Elektroda, glapsson, post #18016861] “Leakage means pressure loss”[Elektroda, glapsson, post #18423679] Fixes range €250–€1 000 and can restore system in under 30 min. Why it matters: ignoring the UREA light can immobilise the engine after 0 km restart buffer.

Quick Facts

• Typical AdBlue tank size: 15–17 L (range in 1.6–2.0 BlueHDi) [Elektroda, lc4540, post #19793789] • Pump+tank assembly price: PLN 3 800–4 800 (€830–1 050) [Elektroda, andrikkk, post #18016861] • Citroën “Goodwill” covers tank <5 yrs & <150 k km [Elektroda, techkon, post #18468866] • AdBlue freezes at −11 °C; heaters cycle every 30 s when <0 °C [Bosch, 2022] • Error codes: P20E8 = low pressure, P20EE = SCR efficiency, P2202/2204 = NOx sensor [Elektroda, various posts]

What triggers the UREA countdown and will the car really refuse to start?

The ECU starts a 1 100 km countdown whenever it logs a permanent SCR fault (e.g., P20E8 or P20EE). Once it reaches 0 km, the engine will crank but not fire after a 5-minute key-off period[Elektroda, palczewskimateusz, post #20903094]

Which part fails most often in PSA AdBlue systems?

Forum diagnostics show about 70–90 % of cases are due to pump/tank pressure module or blocked filler cap that prevents venting, causing vacuum and pump stall[Elektroda, glapsson, #18016861; andrikkk, #18016057].

How can I clear the UREA light after topping up AdBlue?

Use DiagBox or a compatible OBD app: 1. Select Additive/Injections → “Urea refilling”. 2. Enter amount filled. 3. Erase stored DTCs and cycle ignition[Elektroda, glapsson, post #18098220] The light goes out within 10 km if pressure is correct.

Why does error P20E8 return in winter?

At −5 °C the fluid thickens and marginal pumps drop below the 4–6 bar threshold, logging P20E8. Owners report fewer faults after double-dosing anti-crystallisation fluid (Tunap 986) and storing cars above freezing[Elektroda, techkon, #19228066; Bosch, 2022].

Can I replace only the pump instead of the whole tank?

Yes. The pump unbolts from the tank base. Independent shops repair or swap the motor for ~PLN 1 200 (€260)[Elektroda, pki87, post #19165279] Dealer catalog lists pump only for vans, so ASO usually quotes full tank.

What does error P20EE indicate?

P20EE means the catalytic reduction efficiency is too low. Common causes: stuck injector, exhausted NOx sensor, or long pump warm-up. Replacing the upstream NOx sensor solved it for 100 % of three documented cases[Elektroda, Tomeklukasiak, post #19436464]

My scanner shows 2.5 L level even after a full fill—why?

Tank modules sometimes lose calibration after voltage dips. Run the DiagBox ‘Level Sensor Re-initialisation’ test and re-enter the filled quantity; the gauge then updates correctly[Elektroda, misiugal, post #18279500]

Does Tunap 986/988 really help?

Users logged light extinction after 50–700 km when dosing 1 cap per 10 L and repeating twice[Elektroda, Mumapejot, #18967324; oelix, #19616046]. It dissolves urea crystals but cannot fix electrical pump faults.

Edge case: what if the AdBlue pipe cracks in a crash?

Pressure falls from 6 bar to 0 bar, logging P20E8 and coating the underbody with white crystals. Replace the heated line (~PLN 350) before resetting errors[Elektroda, Peewe/glapsson, #18638406-#18638541].

How much does a NOx sensor cost and can it be cleaned?

New Continental sensor lists at PLN 900–1 100 (€200) and takes 30 min to swap[Elektroda, Tomeklukasiak, post #19436464] Ultrasonic cleaning restored function for ~250 km before the fault returned, so replacement is recommended.

Can the SCR system be legally disabled?

Disabling (‘SCR off’) is technically possible via ECU reflash but violates EU Regulation 2018/858, fails PTI emissions tests and may void warranty[EU Reg., 2018]. Experts advise repair over removal[Elektroda, djkocurr, post #18336751]
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