AdBlue Removal (SCR Off) — Selective Catalytic Reduction Disable

AdBlue removal is a professional ECU calibration service designed to disable the Selective Catalytic Reduction (SCR) system present in modern diesel engines.
The SCR system uses AdBlue (a urea-based solution) to reduce nitrogen oxide (NOx) emissions by converting them into harmless nitrogen and water vapor through chemical reaction in the catalyst.
While effective for emissions compliance, the AdBlue system is often expensive to maintain and prone to failures caused by sensors, pumps, injectors, or its dedicated control module.
Our AdBlue removal solution eliminates these issues safely, preventing SCR-related faults, warning messages, and limp-mode activations—while preserving all other ECU protections and diagnostic capabilities.

How the AdBlue / SCR system works

The SCR system injects AdBlue fluid into the exhaust stream upstream of the SCR catalyst.
The ammonia released from the urea chemically reacts with NOx gases to neutralize pollutants.
Control is managed by a separate AdBlue ECU (DCU or ACM) communicating with the main engine ECU over the CAN network.
If the tank runs empty, or components fail, the ECU can impose a countdown limiting starts or torque output.
With a professional AdBlue removal, these routines and diagnostic triggers are safely disabled within the ECU software while maintaining full compatibility with other systems.

When AdBlue removal is recommended

• When AdBlue injectors, pumps, or sensors fail and replacement is uneconomical.
• When DTCs such as P20E8, P204F, P207F persist even after mechanical repair.
• For off-road, agricultural, or motorsport vehicles where SCR systems are not required.
• To prevent recurring AdBlue countdowns and limp-mode limitations due to system malfunctions.

How to perform the AdBlue / SCR removal procedure

Our service modifies the ECU to disable AdBlue dosing, level checks, and all related fault codes while keeping non-SCR diagnostics active.
On platforms with an external module (DCU/ACM), communication is cleanly terminated or recalibrated.
Follow these steps to ensure a proper process:

1. Load the original ECU file with all components connected and verify that the car starts normally.
2. Fill the AdBlue reservoir and use a scanner to reset all AdBlue parameters—ensure no active faults remain.
3. Flash the modified file provided by TuningBot and clear the DTC memory.
4. Unplug the AdBlue ECU, pump, and sensors (if applicable) as described on our documentation page.

WRITE THE FILE ONLY WHEN THE SCR SYSTEM IS FULLY FUNCTIONAL AND RESET.
ALWAYS RESET THE ADBLUE SYSTEM USING A DIAGNOSTIC TOOL BEFORE FLASHING THE MODIFIED FILE.

Benefits and technical notes

– Eliminates AdBlue-related faults, warnings, and limp-mode activations.
– Preserves all essential diagnostics and engine protection logic.
– Reduces maintenance costs from AdBlue component failures.
– Suitable for off-road, heavy-duty, and motorsport vehicles.
– Tested and dyno-validated for stable operation and safety.

Important: AdBlue removal is intended exclusively for off-road or motorsport use, or where local laws allow emission-system modifications.
Never use AdBlue-disabled software on public roads.

Additional information

The AdBlue / SCR system is one of the most complex after-treatment subsystems in modern diesels.
It involves temperature sensors, NOx sensors, dosing pumps, level sensors, and a dedicated ECU.
When these components fail, vehicles often log multiple DTCs, trigger dashboard countdowns, or enter torque limitation modes.
A calibrated AdBlue removal from TuningBot ensures that the vehicle operates normally without triggering these errors, while maintaining the full functionality of EGR, DPF, boost, and fueling systems.
This approach is safer and more reliable than using emulator boxes or external bypass modules.