AdBlue & SCR Repair
AdBlue & SCR Service – Repair, Diagnostics and Restoration
FixBox d.o.o. is a specialised workshop for AdBlue and SCR systems on EURO 5 and EURO 6 diesel vehicles. We resolve faults and failures, replace sensors and components, and carry out SCR core repair with a warranty and restoration of the system’s factory function. Our customers come from all over Bosnia and Herzegovina, as well as from Germany, Austria and Switzerland.
What are the AdBlue and SCR systems?
AdBlue (DEF – Diesel Exhaust Fluid) is a urea-based fluid injected into the SCR system (Selective Catalytic Reduction) to reduce harmful nitrogen oxide (NOx) emissions from a diesel engine’s exhaust gases. A properly working AdBlue/SCR system is a requirement for meeting EURO 6 standards and passing the roadworthiness test.
AdBlue is also called DEF (Diesel Exhaust Fluid) — a standardised fluid of 32.5% urea and demineralised water, dosed from a separate tank into the exhaust system. If AdBlue runs out, is of poor quality, crystallises or the system fails, the vehicle enters a protection mode and gradually blocks engine start.
AdBlue / SCR problems we solve
- the “AdBlue no restart in 1000 km” warning (countdown to engine-start blocking)
- fault P204F00 and related SCR system faults
- an AdBlue warning light that will not go out
- excessive AdBlue fluid consumption
- faulty NOx sensor and AdBlue quality sensor
- faulty AdBlue pump, dosing injector and tank heater
- urea crystallisation and system clogging
- damaged or clogged SCR core (catalyst)
AdBlue / SCR diagnostics – not just clearing fault codes
Before any repair we carry out a complete diagnosis with original authorised equipment:
- reading and analysing all SCR system parameters,
- measuring and validating NOx sensor signals,
- checking the operation of the pump, dosing injector and heater,
- analysing AdBlue consumption and system pressure.
SCR system repair and restoration
Depending on the fault, we offer:
- replacement of NOx and quality sensors,
- repair or replacement of the AdBlue pump, dosing injector and heater,
- SCR core (catalyst) repair by fitting a high-quality new core,
- software recalibration and restoration of the system’s factory function,
- complete testing – the vehicle passes the roadworthiness test and TÜV without issues.
Our goal is a correct, factory EURO 6 system – not temporary workarounds.
“AdBlue no restart in 1000 km” – the most common problem
When the SCR system detects a fault, the vehicle starts counting down the kilometres until engine start is blocked. The solution is to remove the cause and recalibrate the system, restoring the factory function – not to illegally switch the system off.
Blocked engine start due to an AdBlue fault
An AdBlue/SCR fault legally triggers a gradual vehicle lockout. The typical sequence is:
- a yellow AdBlue light and a warning on the display,
- a red warning and the message “no restart in 1000 km” (kilometre countdown),
- engine power limitation,
- finally — the engine cannot be started until the fault is fixed.
If the vehicle is already locked or counting down to a lockout, the solution is to remove the cause and recalibrate the system — not an illegal delete. After the repair we restore the factory function and reset the countdown correctly, so the vehicle runs properly and passes the roadworthiness test.
Most common AdBlue / SCR fault codes
- P204F00 – SCR system performance
- P20E8 – low pressure in the SCR system
- P229F – NOx sensor fault
- P2BAF – NOx emission exceeded
AdBlue service for all vehicle makes
- VW, Audi, Škoda, Seat
- BMW, Mercedes-Benz
- Ford, Peugeot, Citroën, Renault, Opel
- as well as other passenger cars, vans and trucks
AdBlue / SCR service price
The price depends on the type of fault and the vehicle. In most cases, repair or restoration is significantly cheaper than replacing complete components. For an exact quote, contact FixBox.
Related service: DPF, GPF and catalytic converter
AdBlue/SCR is part of the vehicle’s wider emission system. If you also have DPF filter problems, see our DPF cleaning and repair service.
Why FixBox for AdBlue service
- a workshop specialised in emission systems (DPF, SCR, AdBlue),
- original authorised diagnostics,
- a warranty on the work carried out,
- hundreds of successfully solved cases,
- customers from all over BiH and the diaspora (Germany, Austria, Switzerland).
Frequently asked questions (FAQ)
What does the AdBlue fault “no restart in 1000 km” mean?
The system has detected a fault and is counting down the kilometres until engine start is blocked. It is solved by removing the cause and recalibrating the system, not by clearing the fault.
Can you fix fault P204F00?
Yes. Through diagnostics we determine the exact cause (sensor, pump or SCR core) and restore the factory function of the SCR system.
Why is too much AdBlue fluid being consumed?
The cause is usually a fault in the dosing system or a sensor. We check the system and remove the cause of the excessive consumption.
Can the NOx sensor be replaced individually?
Yes, when that is the correct solution, we replace individual system components.
Do you restore the system to factory condition for the roadworthiness test and TÜV?
Yes. Our goal is a correct EURO 6 system that passes the roadworthiness test and TÜV without issues.
Book an AdBlue service
If you have an AdBlue fault, a warning light or a countdown to an engine lockout, get in touch with the emission-system specialists.