AdBlue Consumption Too High: Causes, Symptoms and Solutions
AdBlue Consumption Too High: Causes, Symptoms and Solutions
Why Is My Vehicle Using Too Much AdBlue?
AdBlue Consumption Too High is a common complaint among owners of modern diesel vehicles fitted with SCR technology. While all AdBlue-equipped vehicles consume fluid during normal operation, excessive consumption often indicates an underlying issue within the emissions system.
Many drivers first notice the problem when AdBlue warning messages appear more frequently than expected or when refill intervals become significantly shorter.
In some cases the increase is gradual, while in others consumption can rise dramatically over a short period.
What Is Normal AdBlue Consumption?
AdBlue consumption varies depending on:
- Vehicle type
- Engine size
- Driving style
- Load carried
- Operating temperature
- SCR system design
Most vehicles use only a small percentage of AdBlue relative to diesel consumption. However, when a fault develops within the SCR system, usage can increase substantially.
Common Causes of High AdBlue Consumption
Several issues can cause excessive AdBlue usage.
The most common include:
- AdBlue injector faults
- Incorrect dosing
- NOx sensor faults
- SCR efficiency issues
- AdBlue contamination
- AdBlue crystallisation
- Exhaust leaks
- Software calibration issues
- SCR catalyst deterioration
In many cases more than one issue may be present simultaneously.
How AdBlue Injector Problems Increase Consumption
The AdBlue injector is responsible for delivering a precise quantity of fluid into the exhaust stream.
If the injector begins to malfunction, it may:
- Deliver excessive AdBlue
- Produce an incorrect spray pattern
- Contribute to crystallisation
- Reduce SCR efficiency
The vehicle may then attempt to compensate, resulting in higher fluid consumption.
Can NOx Sensor Faults Cause High AdBlue Consumption?
Yes.
NOx sensors provide the emissions data used by the engine control unit to control AdBlue dosing.
If a sensor begins to provide inaccurate readings, the vehicle may inject more AdBlue than necessary in an attempt to maintain emissions compliance.
This can lead to:
- Increased AdBlue usage
- SCR efficiency faults
- Warning messages
- Countdown warnings
Common related fault codes include P2200 and P229F.
Can AdBlue Crystallisation Increase Consumption?
Yes.
AdBlue Crystallisation can affect injector performance and SCR efficiency. As deposits accumulate, the vehicle may struggle to achieve the desired emissions reduction.
This can result in:
- Increased dosing activity
- Greater AdBlue consumption
- SCR fault codes
- Reduced system performance
Crystallisation is one of the most frequently overlooked causes of excessive AdBlue usage.
Which Vehicles Commonly Experience High AdBlue Consumption?
Excessive AdBlue usage is frequently reported on:
- Mercedes Sprinter
- Mercedes Vito
- Ford Transit
- Volkswagen Crafter
- Peugeot Boxer
- Citroën Relay
- Renault Master
- Iveco Daily
- DAF Trucks
- MAN Trucks
- Volvo Trucks
- Scania Trucks
The exact symptoms vary depending on the vehicle and the underlying fault.
What Fault Codes Are Associated With High AdBlue Consumption?
Common fault codes include:
- P20EE
- P204F
- P207F
- P2200
- P229F
Manufacturer-specific SCR and AdBlue system codes may also be present.
The fault code itself often provides valuable clues regarding the root cause.
Can High AdBlue Consumption Lead to Other Problems?
Yes.
If left unresolved, excessive consumption may eventually contribute to:
- AdBlue system contamination
- SCR efficiency faults
- Countdown warnings
- No-start messages
- Increased operating costs
Many vehicle owners focus on the fluid usage itself while overlooking the underlying issue causing it.
How Is High AdBlue Consumption Diagnosed?
Diagnosis typically involves:
- Reading stored fault codes.
- Reviewing live diagnostic data.
- Testing NOx sensor performance.
- Inspecting injector operation.
- Checking SCR efficiency.
- Verifying AdBlue quality.
- Inspecting for contamination and deposits.
A structured diagnostic process is essential to identify the true cause.
Can Excessive AdBlue Consumption Be Prevented?
In many cases the risk can be reduced by:
- Using Blue Resolve whenever AdBlue is topped up.
- Keeping the AdBlue system free from contamination.
- Addressing warning lights promptly.
- Investigating unusual consumption patterns early.
Many serious SCR faults begin with relatively minor changes in system performance.
How Blue Resolve May Help
Where excessive AdBlue consumption is linked to contamination, deposits or AdBlue crystallisation, Blue Resolve may help support cleaner SCR system operation.
Regular use as part of routine AdBlue top-ups may help reduce the conditions that contribute to deposit formation and inefficient dosing.
Frequently Asked Questions
Does high AdBlue consumption always indicate a fault?
Not always, but a significant increase in consumption often suggests that further investigation is required.
Can a NOx sensor cause excessive AdBlue usage?
Yes. Incorrect sensor readings can result in excessive dosing.
Can crystallisation increase AdBlue consumption?
Yes. Deposits can affect SCR efficiency and contribute to increased fluid usage.
Is high AdBlue consumption expensive?
The fluid cost is often minor compared with the cost of ignoring the underlying SCR fault.
Can Blue Resolve help reduce deposit-related consumption issues?
Where deposits and contamination are contributing factors, Blue Resolve may help support cleaner SCR system operation.