Fault Code Directory
Our AdBlue Fault Code Directory helps you identify specific issues with your vehicle's Selective Catalytic Reduction (SCR) system. If you have a dashboard warning or a countdown until your engine will not restart, identifying the precise error code is the first step towards an effective AdBlue solution.
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01Understanding the service
Understanding AdBlue Delete and Fault Indicators
AdBlue Delete is the most comprehensive way to resolve persistent system failures that lead to 'No Start' conditions. When your vehicle logs codes such as P20E8 (reductant pressure too low) or P20EE (SCR catalyst efficiency below threshold), the ECU often triggers a countdown. An AdBlue Delete involves recalibrating the engine management software so the vehicle no longer requires AdBlue fluid or relies on the complex sensor network. This process effectively bypasses the entire SCR system, ensuring that faulty injectors, heaters, or NOx sensors no longer interfere with your vehicle's drivability. We can provide a mobile service to address these codes at your location.
- P20EE: SCR NOx Catalyst Efficiency Below Threshold
- P204F: Reductant System Performance
- P207F: Reductant Quality Performance
- P208E: Reductant Injector Stuck Closed
Expert AdBlue Removal for Persistent Codes
AdBlue Removal is a popular choice for motorists facing recurring expenses from faulty hardware. Common issues on many versions of modern diesel engines include the P2BAD code, which indicates a NOx exceedance, or P20BC relating to the reductant heater. This service is particularly beneficial if you have already attempted minor repairs only for the warning light to return. We recommend sending your vehicle registration and the specific fault codes via WhatsApp so we can confirm the exact software version and hardware configuration of your vehicle before arrival.
Professional AdBlue Repair and Diagnosis
While some drivers opt for a full bypass, an AdBlue Repair may involve replacing specific components like the NOx sensor or the AdBlue pump. If your diagnostic tool shows U029E (lost communication with NOx sensor B) or U010E (lost communication with reductant control module), it suggests a wiring or hardware failure. Our technicians specialise in diagnosing these complex communication errors. On many versions of Euro 6 engines, these faults can be intermittent, making a professional assessment vital. We carry the latest diagnostic equipment to your home or workplace to ensure the repair is targeted and effective, preventing unnecessary spend on the wrong parts.
Mobile AdBlue Fix for Countdown Timers
When your dashboard displays a 'Restricted Performance' message or a mileage countdown, you need an AdBlue Fix that works immediately. We provide a mobile service that comes to you to clear these codes and implement a lasting solution. Whether it is a software patch or a component replacement, our goal is to get your vehicle back to full power without the threat of a non-start situation. Common codes that we fix daily include P203F (reductant level too low - even when full) and P21C5. Please ensure you have your V5 or registration number ready so we can verify the specific engine variant and SCR generation used in your vehicle.
Common Error Codes by Manufacturer
Different manufacturers use varying protocols for their SCR systems, though many fault codes are standardised. On certain models, you may see 'AdBlue System Failure' accompanied by codes like P20EE or P204F. Some brands also use unique codes for specific failures. Our mobile technicians can assist with the nuances of your vehicle's software and carry the specific tools required for its ECU. By identifying the code early, you can avoid the inconvenience of a total engine lockout.
- Volkswagen/Audi: P20E8, P205C
- Mercedes-Benz: P203F, P20BC
- Ford/PSA: P20EE, P208E
- BMW: 804113, 804115
What Happens When We Visit?
From booking to completion, our experienced mobile technicians make the process straightforward.
- 1
Book Your Appointment
We confirm your vehicle, location, service and appointment.
- 2
Technician Calls With ETA
On the day, your technician calls with an estimated arrival time.
- 3
We Arrive & Diagnose
We connect diagnostic equipment, check the vehicle and identify relevant faults.
- 4
ECU Software Work
We read the original ECU software, prepare the AdBlue modification and apply it.
- 5
Final Checks & Resets
Final diagnostics, applicable fault-code resets and checks to confirm the agreed work is complete.
- 6
Payment & Receipt
We take payment, provide a receipt and explain the applicable software warranty.
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- Clear Quotation Before Booking
- Experienced Technicians
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- Nationwide Mobile Service Across England
- No Fix, No FeeSubject to terms
- Lifetime Software WarrantyCovers the software we install
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AdBlue Fault Codes Explained
Found a fault code during a diagnostic scan? Enter it below to understand what it could mean, what warning signs to look out for and what information our mobile AdBlue specialists need to help you.
From AdBlue pressure faults to NOx sensor warnings and SCR system problems, explore common diagnostic codes in simple English.
32 diagnostic codes
- P20E8
Fault name
Reductant pressure too low
What it means
The system has reported insufficient reductant pressure. Diagnostic checks help establish the cause, rather than assuming a failed pump.
VIEW FAULT DETAILS - P20E9
Fault name
Reductant pressure too high
What it means
The code concerns AdBlue pressure or its sensing circuit. Diagnostic readings help distinguish the possible causes.
VIEW FAULT DETAILS - P204A
Fault name
Reductant pressure sensor circuit
What it means
The code concerns AdBlue pressure or its sensing circuit. Diagnostic readings help distinguish the possible causes.
VIEW FAULT DETAILS - P204B
Fault name
Reductant pressure sensor circuit range/performance
What it means
The code concerns AdBlue pressure or its sensing circuit. Diagnostic readings help distinguish the possible causes.
VIEW FAULT DETAILS - P204C
Fault name
Reductant pressure sensor circuit low
What it means
The code concerns AdBlue pressure or its sensing circuit. Diagnostic readings help distinguish the possible causes.
VIEW FAULT DETAILS - P204D
Fault name
Reductant pressure sensor circuit high
What it means
The code concerns AdBlue pressure or its sensing circuit. Diagnostic readings help distinguish the possible causes.
VIEW FAULT DETAILS - P20EE
Fault name
SCR NOx catalyst efficiency below threshold
What it means
SCR NOx reduction efficiency has been reported below its expected threshold. The full scan and sensor readings help identify possible causes.
VIEW FAULT DETAILS - P204F
Fault name
Reductant system performance, bank 1
What it means
The code concerns SCR operation or monitoring. Read it alongside the full scan and vehicle-specific information.
VIEW FAULT DETAILS - P20EA
Fault name
Reductant control module power relay de-energizing performance
What it means
The code concerns SCR operation or monitoring. Read it alongside the full scan and vehicle-specific information.
VIEW FAULT DETAILS - P2BAA
Fault name
NOx exceedance, low reagent consumption
What it means
The code concerns SCR operation or monitoring. Read it alongside the full scan and vehicle-specific information.
VIEW FAULT DETAILS - P2BAD
Fault name
NOx exceedance, root cause unknown
What it means
The code concerns SCR operation or monitoring. Read it alongside the full scan and vehicle-specific information.
VIEW FAULT DETAILS - P2BAE
Fault name
NOx exceedance, NOx control monitoring system
What it means
The code concerns SCR operation or monitoring. Read it alongside the full scan and vehicle-specific information.
VIEW FAULT DETAILS - P2200
Fault name
NOx sensor circuit, bank 1
What it means
The code concerns a NOx sensor circuit or signal. It does not alone confirm which part needs attention.
VIEW FAULT DETAILS - P2202
Fault name
NOx sensor circuit low, bank 1
What it means
The code concerns a NOx sensor circuit or signal. It does not alone confirm which part needs attention.
VIEW FAULT DETAILS - P2209
Fault name
NOx sensor heater sense circuit range/performance, bank 1
What it means
The code concerns a NOx sensor circuit or signal. It does not alone confirm which part needs attention.
VIEW FAULT DETAILS - P2210
Fault name
NOx sensor heater sense circuit low, bank 1
What it means
The code concerns a NOx sensor circuit or signal. It does not alone confirm which part needs attention.
VIEW FAULT DETAILS - P229F
Fault name
NOx sensor circuit range/performance, bank 1 sensor 2
What it means
The code concerns a NOx sensor circuit or signal. It does not alone confirm which part needs attention.
VIEW FAULT DETAILS - P2047
Fault name
Reductant injection valve circuit/open, bank 1 unit 1
What it means
The code concerns a dosing or aftertreatment injector. Check the fitted system and full scan before assuming a cause.
VIEW FAULT DETAILS - P2048
Fault name
Reductant injection valve circuit low
What it means
The code concerns a dosing or aftertreatment injector. Check the fitted system and full scan before assuming a cause.
VIEW FAULT DETAILS - P20CE
Fault name
Exhaust aftertreatment fuel injector A stuck open
What it means
The code reports an exhaust aftertreatment fuel injector stuck open. It is not automatically an AdBlue injector fault; the fitted system needs checking.
VIEW FAULT DETAILS - P203F
Fault name
Reductant level too low
What it means
The system reports that the reductant level is too low. Check the actual fluid level and whether the reported level is accurate.
VIEW FAULT DETAILS - P203A
Fault name
Reductant level sensor circuit
What it means
The code concerns the reported fluid level or a tank sensor circuit. Check the exact definition and diagnostic readings.
VIEW FAULT DETAILS - P203B
Fault name
Reductant level sensor circuit range/performance
What it means
The code concerns the reported fluid level or a tank sensor circuit. Check the exact definition and diagnostic readings.
VIEW FAULT DETAILS - P203D
Fault name
Reductant level sensor circuit high
What it means
The code concerns the reported fluid level or a tank sensor circuit. Check the exact definition and diagnostic readings.
VIEW FAULT DETAILS - P205D
Fault name
Reductant tank temperature sensor circuit high
What it means
The code concerns the reported fluid level or a tank sensor circuit. Check the exact definition and diagnostic readings.
VIEW FAULT DETAILS - P205E
Fault name
Reductant tank temperature sensor circuit intermittent/erratic
What it means
The code concerns the reported fluid level or a tank sensor circuit. Check the exact definition and diagnostic readings.
VIEW FAULT DETAILS - P20BA
Fault name
Reductant heater A control circuit performance
What it means
The code concerns a reductant heater circuit. The vehicle-specific checks help establish the cause.
VIEW FAULT DETAILS - P20BD
Fault name
Reductant heater B control circuit
What it means
The code concerns a reductant heater circuit. The vehicle-specific checks help establish the cause.
VIEW FAULT DETAILS - P207F
Fault name
Reductant quality performance
What it means
The system has reported reductant quality performance. The code alone does not identify the cause.
VIEW FAULT DETAILS - P208A
Fault name
Reductant pump A control circuit
What it means
The code concerns pump control or its circuit. A full scan helps establish the appropriate checks.
VIEW FAULT DETAILS - P208B
Fault name
Reductant pump control range/performance
What it means
The code concerns pump control or its circuit. A full scan helps establish the appropriate checks.
VIEW FAULT DETAILS - P208C
Fault name
Reductant pump control circuit low
What it means
The code concerns pump control or its circuit. A full scan helps establish the appropriate checks.
VIEW FAULT DETAILS
ADBLUE WARNING ON YOUR DASHBOARD?
Send us your registration, postcode and diagnostic fault code. We'll check the details and explain the available mobile service options.
Customer questions
Questions customers ask us
Still unsure? Send us your registration and a photo of the warning on WhatsApp.
Ask on WhatsAppWhat is AdBlue Delete?
AdBlue Delete is a software-based service where the vehicle's ECU is reprogrammed to stop monitoring the SCR system. This eliminates the need for AdBlue fluid and prevents the car from entering 'limp mode' or 'no start' states due to sensor or pump failures. It is a long-term alternative for recurring AdBlue issues.
What is AdBlue Removal?
AdBlue Removal refers to the process of electronically disabling the AdBlue system. By removing the system's influence over the engine management, the vehicle can operate without the SCR components functioning. This is frequently chosen by drivers to avoid the high costs of replacing pumps, tanks, and NOx sensors.
What is the difference between AdBlue Delete and AdBlue Repair?
AdBlue Repair involves replacing faulty components like sensors or pumps to restore the system to original working order. AdBlue Delete is a software recalibration that bypasses the system entirely. Repair maintains the system's function, while Delete ensures the system can no longer cause vehicle breakdowns or fault codes.
What is an AdBlue Fix?
An AdBlue Fix is a general term for any service that resolves an SCR system fault. This could range from a simple sensor replacement (Repair) to a full software bypass (Delete). Our technicians assess the fault codes present to determine the most effective fix for your specific vehicle and budget.
What vehicle and postcode information do you need for a quote?
To provide an accurate quote, we require your full vehicle registration number so we can identify the specific engine and ECU type. We also need your current postcode to ensure we can dispatch a mobile technician to your exact location at home, work, or the roadside.
Can I send my warning light photo on WhatsApp?
Yes, we encourage customers to send photos of their dashboard warning lights and any diagnostic fault codes via WhatsApp. This helps our specialist technicians identify the likely cause of the AdBlue failure before we arrive, ensuring we are fully prepared to fix the issue on-site.
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
Warning topics: UREA and AdBlue warning lights · restart countdowns
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Get Your AdBlue Quote
Enter your registration, postcode and mobile number. We'll check your vehicle and reply with a quotation. You can add a photo of your dashboard warning in the WhatsApp chat.
Countdown about to hit zero?
Call or WhatsApp with the warning, miles remaining and where the vehicle is. Emergency callouts carry an additional charge, confirmed before dispatch.