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NOx off: software solution for failed or missing NOx sensors

Euro 5 and Euro 6 diesels use one or two NOx sensors: upstream (before the SCR catalyst) and downstream (after it). The ECU uses them to dose AdBlue/DEF and to check catalyst efficiency. A NOx sensor is expensive, has a short service life in heavy use, and when it fails the engine often goes into reduced power or a countdown to a speed limit.

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Typical problems

Sensor failure — heater circuit, CAN communication or plausibility faults (for example P2200–P2213, P229F, SPN 3216/3226).
Long lead times and high price of genuine sensors, especially on trucks and machines.
Inducement — torque reduction or speed limit after a sensor fault is stored.

What we do in the file

Upstream and/or downstream NOx sensor monitoring disabled.
Sensor values replaced so dependent functions (SCR efficiency, dosing models) keep working without errors.
NOx-related DTCs and inducement triggers removed.
Usually combined with SCR/AdBlue off; can also be done alone when the SCR system stays active.

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Supported vehicles

Cars, vans, trucks, buses, agricultural and construction equipment with Bosch EDC17/MD1/MG1, Continental/Siemens, Delphi, Denso, Cummins and other ECUs.

How to order

Register in the AUTO-REMAP file service, upload the original read of the ECU, tick NOx off together with any other options you need, and download the modified file — usually within minutes, complex ECUs within working hours. Checksums are corrected automatically.

Not sure your ECU is supported? Check your vehicle in the tuning catalog, look up truck and machine software in the solutions database, or write to us in any messenger.