AdBlue removal is a professional ECU calibration service designed to disable the Selective Catalytic Reduction (SCR) logic in modern diesel engines. The service targets SCR-specific functions only and is intended exclusively for off-road, industrial or motorsport applications where local regulations allow emission-system modifications.

AdBlue Removal (SCR Off) — Selective Catalytic Reduction Disable

The SCR system uses AdBlue (a urea-based solution) to reduce NOx emissions by converting them into nitrogen and water inside the catalyst. While effective for emissions compliance, AdBlue subsystems are complex and often expensive to maintain. A professional AdBlue removal calibration neutralises SCR-related strategies and fault codes while preserving all non-emission safety functions and diagnostics.

For general background on Selective Catalytic Reduction you can read the
SCR article on Wikipedia.

How the AdBlue / SCR system works

The SCR system injects AdBlue fluid into the exhaust upstream of the SCR catalyst. The urea decomposes to ammonia, which reacts with NOx gases to reduce emissions. Control is usually managed by a dedicated AdBlue ECU (DCU or ACM) that communicates with the engine ECU via CAN. If the tank is empty or components fail, the system can trigger DTCs, dashboard warnings, torque limitation or start countdowns.

With a correctly engineered AdBlue removal calibration, these specific routines and diagnostic triggers are disabled in the ECU software, while all other engine protection and non-SCR diagnostics remain active.

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 repairs.
• For off-road, agricultural, heavy-duty or motorsport vehicles where SCR systems are not required.
• To prevent recurring AdBlue countdowns and limp-mode limitations due to SCR malfunctions.

How the AdBlue / SCR removal procedure works

Our calibration disables AdBlue dosing, level checks and SCR-specific fault codes inside the ECU, while keeping other diagnostics active. On vehicles with an external module (DCU/ACM), CAN communication is cleanly terminated or recalibrated depending on platform requirements. A typical workflow is:

1. Load the original ECU file with all AdBlue components connected and verify that the engine starts and runs normally.
2. Fill the AdBlue reservoir and, using a diagnostic tool, reset AdBlue parameters and counters. Confirm that no active SCR faults remain.
3. Flash the modified file provided by TuningBot and clear the DTC memory.
4. Unplug the AdBlue ECU, pump and sensors (where applicable) following the documented procedure for that platform.

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

Benefits and technical notes

• Eliminates AdBlue-related faults, warnings and limp-mode activations.
• Preserves all essential diagnostics and engine protection logic unrelated to SCR.
• Reduces maintenance costs linked to SCR pumps, injectors, NOx sensors and level sensors.
• Suitable for off-road, heavy-duty, industrial and motorsport applications.
• Software-only approach – no external emulators or “fooler” boxes needed.
• Each calibration is bench-validated and, where applicable, dyno-tested for stable operation.

Additional information

The AdBlue / SCR system is one of the most complex after-treatment subsystems in modern diesel vehicles. It integrates temperature sensors, NOx sensors, dosing pumps, level sensors and a dedicated controller. When these components fail, vehicles typically log multiple DTCs, display countdowns and may enter torque limitation modes.

A calibrated AdBlue removal from TuningBot ensures that the engine operates normally without triggering SCR-related errors, while maintaining full functionality of EGR, DPF, boost-control and fueling strategies. This software-based solution is more robust and transparent than using emulator boxes or external bypass modules, which can create inconsistent signals and complicate diagnostics.

For an overview of all available ECU strategies, including DPF, EGR and torque-related services, you can consult the ECU Services coverage page before requesting your file.

Legal notice: AdBlue / SCR removal is intended exclusively for non-road, industrial or motorsport use, or where local legislation explicitly allows emission-system modifications. Using SCR-off software on public roads may be illegal and remains the sole responsibility of the vehicle owner and operator.

If your original file is ready, upload it via Tune Your File and request the AdBlue Removal (SCR Off) calibration from the TuningBot team.