“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
AdBlue Services
Tuning & Additional Services
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Seeing a restart countdown warning or an AdBlue system fault on your Mercedes A Class dashboard can be stressful. Fix My AdBlue offers a specialist, mobile software solution to resolve these issues at your home or workplace. For a free, no obligation quote, provide us with your vehicle registration and postcode.
24/7 Emergency Callouts Available
Emergency Mobile AdBlue Assistance. Additional emergency callout charge applies. Subject to availability.
01Common AdBlue warnings
This is the most urgent warning, indicating the vehicle will be immobilised once the countdown reaches zero. It is often triggered by a detected fault within the SCR system, not necessarily a low fluid level.
A generic message accompanied by the engine management light, pointing to a malfunction somewhere in the AdBlue system. This could be related to the pump, injector, tank heater, or a sensor.
The AdBlue warning persists even after you have topped up the tank, often with a message like an AdBlue warning referring you to the handbook. This suggests the system has not reset, which can be due to a faulty sensor or a locked out ECU.
Your A Class has NOx sensors to monitor emissions, and their failure is a common cause of AdBlue system warnings. A diagnostic check is needed to pinpoint the source, as the warning itself doesn't confirm the sensor has failed.
To prevent further emissions system damage, the vehicle's ECU may restrict engine power, known as limp mode. This is a clear sign of a significant fault that requires professional attention.
The amber EML can illuminate for many reasons, with AdBlue system faults being a frequent culprit on modern diesel models. We can perform diagnostics to read the specific fault codes stored in the ECU.
02Our service
Our process begins with a full diagnostic scan to identify the specific fault codes causing your A Class's AdBlue warnings. We then perform a specialist AdBlue Delete by reprogramming the engine control unit (ECU) with our custom software, which tells the system to bypass the AdBlue components. Please note, some newer A Class models feature protected ECUs that may require unlocking at an additional cost, which is always confirmed before we start. This is a mobile service performed at your location, and we can also provide optional performance or economy remaps subject to suitability.
03Why choose Fix My AdBlue
From booking to completion, our experienced mobile technicians make the process straightforward.
We confirm your vehicle, location, service and appointment.
On the day, your technician calls with an estimated arrival time.
We connect diagnostic equipment, check the vehicle and identify relevant faults.
We read the original ECU software, prepare the AdBlue modification and apply it.
Final diagnostics, applicable fault-code resets and checks to confirm the agreed work is complete.
We take payment, provide a receipt and explain the applicable software warranty.
04Vehicle compatibility
Does my Mercedes A Class have AdBlue? While AdBlue is common on many modern diesels, not every A Class is equipped with it. Fitment is dependent on the specific engine, model year, and original emissions specification. For your Mercedes A Class, we check the registration, engine, build specification and ECU details rather than assuming fitment or service support from its age or badge. The only certain way to know is to let us check your vehicle's registration, which we do before providing any quote.
Whether it's an AdBlue warning, a fault that keeps returning or a restart countdown, we can check your Mercedes-Benz A-Class's compatibility and help you arrange the right service. Our mobile technicians come to your home or workplace.
Optional extras
While arranging your mobile AdBlue appointment, you can also ask about economy or performance remapping and our additional DPF and EGR software services for your Mercedes-Benz A-Class. We'll confirm which options are available for your vehicle.
Customer questions
Still unsure? Send us your registration and a photo of the warning on WhatsApp.
Ask on WhatsAppYes, our AdBlue delete service is designed to resolve these countdown warnings. The software solution deactivates the system that would otherwise immobilise the vehicle.
This usually indicates a fault with a system component, like a sensor, has been detected. The ECU will not clear the warning until the fault is addressed, which our software solution achieves.
Many manufacturers, including Mercedes, introduced enhanced ECU protection on newer vehicles. This requires a specialist process to unlock the ECU before it can be reprogrammed, which may carry an extra cost we confirm upfront.
The easiest way is to ask us. Provide your vehicle registration and we can check its specification for you, confirming compatibility before any booking is made.
These refer to components of the Selective Catalytic Reduction (SCR) system, which uses AdBlue to reduce Nitrogen Oxide (NOx) emissions. A fault in this system triggers the dashboard warnings you are seeing.
The standard mobile service typically takes between 1 to 2 hours at your home or work. If ECU unlocking is required, the process may take longer, but we will advise on this beforehand.
While we are based in Slough and regularly serve London and Heathrow, our mobile technicians cover the entire South East and travel across wider England. Your postcode will confirm our availability.
The price depends on your A Class's specific model year, engine, and ECU type. Please provide your registration and postcode for an accurate, no obligation quote.
They are two terms for the exact same service. Both refer to the software modification we perform on the ECU to disable the AdBlue system, not the physical removal of parts.
We provide a lifetime software warranty on all eligible work, subject to our terms and conditions. We also operate on a No Fix No Fee basis for your peace of mind.
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.
Send us your registration and postcode. We'll check your vehicle, explain the service, confirm your quote and arrange an appointment. Straightforward from start to finish.
Related
These are shared codes found on many diesel vehicles, not faults confirmed for every Mercedes-Benz A-Class. Whether a code applies depends on your vehicle and its diagnostic results.
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