DPF, EGR, AdBlue and OPF Off (non-road use)
Catalyst Off / Decat – catalyst software for non-road vehicles
Software deactivation of the catalyst monitoring (Catalyst Off, Decat, Cat Off) in the engine control unit after the catalyst has been removed on vehicles that are not operated on public roads.
Each request is submitted with the declared vehicle use and the country of use and is reviewed before acceptance. Requests for road vehicles are declined.
Requests are submitted from a DR-files account. If you are not signed in, you will be asked to sign in or register first. The selected service is kept.
Service details
The modification disables the catalyst efficiency diagnostics and the related fault codes (typically P0420/P0430) and, where needed, the evaluation of the rear lambda sensor.
If the vehicle is in road use and the emission system reports faults, the lawful options are a repair of the affected components, a check of the current calibration (File Review) or a return to the original software (Original Files).
Required information
- Vehicle manufacturer, model, year and engine code
- ECU manufacturer, hardware and software number (if known)
- Complete original file read from the control unit, the tool and the read method used
- Declared vehicle use (motorsport, off-road, export) and country of use
- VIN and a description of the vehicle, its use and the technical situation
Typical workflow
- 01Provide the vehicle, control unit and application details.
- 02Submit the request for manual review.
- 03After approval you receive a quote. Submission does not guarantee acceptance.
- 04Processing starts once you accept the price and the credits are charged.
Technical notes
- Emission-related functions are linked; related monitoring and fault codes are assessed as part of the review.
- The price in credits is confirmed in the request after review. Nothing is charged before you accept it.
- The modification makes the vehicle technically unfit for operation on public roads (in the Czech Republic § 37 of Act No. 56/2001 Sb.). With the request you sign a declaration on the use of the vehicle and receive our written notice by e-mail.
Frequently asked questions
Do you provide Decat for road vehicles?
No. Software after a catalyst removal is prepared only for vehicles that are not operated on public roads, for example track cars. For a road vehicle the answer is a catalyst replacement.
What is needed for the request?
The complete original file, the hardware and software number, the VIN, the declared vehicle use with the country of use and a description of the application. Requests for vehicles in road use are declined.
Ready to submit your first file?
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