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AdBlue Guide

Can poor AdBlue cause faults

AdBlue Delete and Removal enquiries often begin with the same question: can poor AdBlue cause faults? Yes. Contaminated, diluted or degraded fluid can affect SCR performance and may trigger warnings or a restart countdown. However, those symptoms can also come from dosing, sensor or electrical faults. Send your registration and warning details before assuming the fluid is responsible.

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01Understanding the service

How poor AdBlue can affect the system

AdBlue is a solution of nominally 32.5% high-purity urea by mass in demineralised water, made to ISO 22241 requirements. Added water, diesel, dirt or other contaminants can affect dosing and exhaust treatment; symptoms are not always immediate. Some vehicles measure fluid quality directly, while others infer a problem from SCR performance. White deposits alone do not prove the fluid is poor: normal AdBlue can leave crystals when water evaporates.

  • Incorrect concentration can reduce NOx conversion.
  • Contamination can damage or obstruct pumps and dosing components.
  • Injector deposits can also result from leaks or dosing problems.
  • Warnings and restart restrictions depend on the vehicle and detected fault.

What the fault codes actually mean

P20EE means SCR NOx Catalyst Efficiency Below Threshold, Bank 1. P207F means Reductant Quality Performance. Neither code proves that the AdBlue itself is defective. Possible causes include incorrect fluid concentration, inadequate dosing, NOx sensor faults, exhaust leaks or catalyst problems. Diagnosis should use the complete fault record and relevant live data. After a repair, some systems need specified tests, adaptation procedures or a successful monitoring cycle before warnings or countdowns clear.

    Check the fitted system before blaming the fluid

    SCR equipment and fault-handling procedures vary by model, engine and production date. Tank, pump, heater and NOx sensor faults can occur even when the correct fluid has been used. A heater fault does not by itself indicate degraded AdBlue, and tank deformation should not automatically be blamed on fluid quality. Send your registration and fault codes so the likely system can be identified and any remaining uncertainty checked diagnostically.

      What to do if contamination is suspected

      Use sealed AdBlue labelled as meeting ISO 22241, within its stated shelf life, and follow its storage instructions. Do not add water or unapproved additives. If diesel or another substance has entered the AdBlue tank, avoid starting the engine and obtain advice before further use. Topping up will not reliably correct contamination. Depending on what entered the tank and whether it has circulated, draining, cleaning and inspection may be required; replacement parts should be based on the findings.

      • Keep the container or a photo of its label and batch details.
      • Record what was added, approximately how much and when.
      • Report any restart countdown promptly.
      • Do not rely on clearing fault codes as a repair.

      Choosing the next step

      A proper assessment separates fluid-quality problems from hardware and electrical faults. Software changes that disable SCR operation do not restore fluid quality or reverse component damage. Send your registration, postcode, warning photo and diagnostic codes to discuss appropriate next steps and check whether a mobile visit is available.

        How it works

        What Happens When We Visit?

        From booking to completion, our experienced mobile technicians make the process straightforward.

        1. 1

          Book Your Appointment

          We confirm your vehicle, location, service and appointment.

        2. 2

          Technician Calls With ETA

          On the day, your technician calls with an estimated arrival time.

        3. 3

          We Arrive & Diagnose

          We connect diagnostic equipment, check the vehicle and identify relevant faults.

        4. 4

          ECU Software Work

          We read the original ECU software, prepare the AdBlue modification and apply it.

        5. 5

          Final Checks & Resets

          Final diagnostics, applicable fault-code resets and checks to confirm the agreed work is complete.

        6. 6

          Payment & Receipt

          We take payment, provide a receipt and explain the applicable software warranty.

        02Why choose Fix My AdBlue

        • Operating Since 2012
        • Experienced Technicians
        • 5.0★ Genuine Google Reviews290+ Verified Google Reviews
        • Nationwide Mobile Service Across England
        • No Fix, No FeeSubject to terms
        • Lifetime Software WarrantyCovers the software we install
        • 24/7 Emergency Callouts AvailableAdditional emergency callout charge applies

        Customer questions

        Questions customers ask us

        Still unsure? Send us your registration and a photo of the warning on WhatsApp.

        Ask on WhatsApp
        What is AdBlue Delete?

        AdBlue Delete refers to software changes intended to disable SCR dosing and associated monitoring. It does not remove contaminated fluid or repair damaged hardware, and results depend on the vehicle and software. Send your registration and fault details so the fitted system can be checked.

        What is AdBlue Removal?

        AdBlue Removal is often used to mean disabling SCR operation in software, rather than physically removing the tank or other components. Ask what any proposed work includes; it should not be confused with draining contaminated fluid.

        What is the difference between AdBlue Delete and AdBlue Repair?

        AdBlue Repair aims to restore SCR operation by identifying and correcting the fault. That might involve replacing contaminated fluid, cleaning or replacing affected parts, repairing wiring or following a manufacturer software procedure. Delete changes system operation rather than repairing the underlying fault.

        What is an AdBlue Fix?

        AdBlue Fix is a general term for resolving an AdBlue-related problem, not a specific technical procedure. A suitable fix depends on diagnosis: poor fluid, low dosing pressure, wiring faults and inaccurate sensor readings can produce similar warnings.

        What vehicle and postcode information do you need for a quote?

        Send your registration, current postcode, mileage and the exact warning message, including any restart countdown. Your registration helps identify the likely vehicle specification, while the postcode lets us check mobile availability. Diagnostic identification may still be needed to confirm the fitted ECU and software.

        Can I send my warning light photo on WhatsApp?

        Yes. Send a clear dashboard photo and any complete diagnostic report, including code suffixes if available. These help with initial assessment but do not establish the cause on their own. Tell us whether the engine still starts and when the warning first appeared.

        Do you offer 24/7 emergency callouts?

        Yes. Our standard hours are Monday to Sunday, 8 AM to 8 PM. Emergency callouts are available 24 hours a day, 7 days a week, subject to location and availability. An additional emergency callout charge applies and is confirmed before dispatch.

        Related

        290+ Verified Google Reviews

        Featured 5-Star Customer Reviews

        Real reviews from real Fix My AdBlue customers, taken straight from Google.

        5.0 on Google

        290+ Verified Google Reviews

        • “Friendly and efficient service, sorted out my adblue issue and did a stage 1 remap on my range rover. Would use again”

          Dec Halford

          3 Oct 2026

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        • “Happy with the remap done on my car to fix the adblue fault. The engineer was polite and efficient. I would highly recommend the company.”

          Michael Carrington

          2 Oct 2026

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        • “These Adblu guys were fantastic! They attended my vehicle and got rid of this issue of adblu! Great service and fabulous communication! Will recommend this company!”

          Muhammad Nasir Uddin

          1 Oct 2026

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        • “Excellent job, arrived exactly when he said he would. Cured my adblue problem with ease ,also remaped”

          norman cass

          1 Oct 2026

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        • “Thank you so much for sorting my adblue fault And remap much appreciated for the quick response And did the job outside my door No travelling to get to you You came to me And The pleasant Technician who did the job thanks so much very happy Customer”

          john Vaughan

          1 Oct 2026

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        • “Really happy with the remap done on my car, polite, efficient service and would highly recommended to anyone. Fixed my Adblue problem and cleared all my lights on the dashboard. My car is now quicker and more fuel efficient, I’m more than happy and very grateful for the service I received.”

          Sean Phillips

          30 Sept 2026

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        • “Excellent service from start to finish. I had an AdBlue fault with my vehicle and they diagnosed and fixed the problem quickly and professionally. Very knowledgeable, efficient and friendly service, and they kept me informed throughout the process. The vehicle is now running perfectly again. I’m really impressed with the service and would highly recommend AdBlue Service to anyone having AdBlue or related vehicle problems. Great job and thank you! 👏🚗”

          Mauricio Carturan

          27 Sept 2026

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        • “Very quick and efficient as well as cost friendly. Good availability as well, Had an adblue fault so couldn't drive, came to my house and solved the issue as well as remapping the car. Thumbs up for quick communication.”

          Ramiz Abdullah

          25 Sept 2026

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        • “Spent a few hundred pounds on diagnostics for other garages to say it cannot be fixed quickly or cheaply but then I found Adblue Fix and they came out to me the following morning and sorted the issues within 20 minutes. I highly recommend them and the life time warranty was a great addition.”

          Sam B

          11 Sept 2026

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        • “Quick, on time, honest about pros and cons of adblue remap, and professional. And, of course, they came to me. Can't really ask for more than that”

          Daniel “Dan” Rosewell

          2 Sept 2026

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        • “This company fixed my ad blue system fault and remapped my car too. Very quick and efficient service totally recommend from a very happy customer thanks guys”

          Craig Savory

          31 Aug 2026

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        • “Fixed my adblue issues in less than 30 mins, saved me thousands!”

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          27 Aug 2026

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        • “Great, efficient service, solved my adblue issues. Would highly recommend”

          Debbie chalmers

          27 Aug 2026

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        • “I would highly recommend E.G. to anyone with issues with the adblue system in there vehicle they were absolutely brilliant and the technician went above and beyond to solve my issue, they get 10 out 10 from me”

          Johnny brown

          25 Aug 2026

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        • “Very satisfied with work on my Citroen berlingo Adblue fix would highly recommend to anyone very polite thank you”

          Sean Cummins

          21 Aug 2026

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        • “Lost count of the amount of Adblue issues I’ve had on my van. Another company had tried previously to fix it but weren’t able to. Tried again with these guys and it was sorted the same day I called! Highly recommended!”

          Robert Lamond

          20 Aug 2026

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        • “Brilliant service from some really great people, my van went from a workhorse to a rocket, I’m so impressed with the difference it’s made, adblue problems are all now gone and the limiter removal has changed my life 😂”

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          20 Aug 2026

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        • “Very happy with my adblue removal recommendation is very high from me to people and a hassle free service”

          Adam Rawlings

          19 Aug 2026

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        • “Fixed the adblue fault on my van. The light come on a Friday and unfortunately my van had MOT on the monday. These guys come out on Sunday and fixed my adblue issue so I was still able to get to my MOT on the Monday. Really great service, the guy that come out was polite and efficient. Can't fault these guys at all, I highly recommend.”

          Sam Geddes

          19 Aug 2026

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        • “I was having issues with the Adblue system and was quoted a lot of money elsewhere to get it. I found these who did it for a fraction of the price and they did a great job. 5* all day long”

          mimmo fiata

          26 Jul 2026

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