Services · ECU file service

Full decat / 2nd lambda off: catalyst and rear O2 sensor monitoring in the ECU

On petrol engines the ECU watches catalyst efficiency through the rear (post-cat) lambda sensors. When the catalyst is removed for a sports exhaust, damaged, or replaced with a high-flow part, the ECU sees it immediately and turns on the check-engine light (P0420/P0430 and similar).

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Typical problems

Catalyst efficiency below threshold — P0420/P0430 after a downpipe or decat exhaust.
Rear lambda faults — heater or signal errors from sensors that no longer sit in the right place.
Fuel trim influence — on some ECUs the rear sensor corrects the mixture; without proper calibration the engine runs off-target.

What we do in the file

Catalyst efficiency diagnosis disabled.
Rear (2nd) lambda sensors disabled, front sensor control left untouched.
OPF/GPF (petrol particulate filter) off when required.
Combined with Stage 1/2 and Pop & Bang if requested.

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Supported vehicles

Petrol cars and motorcycles with Bosch MED17/MEVD17/MG1, Siemens/Continental Simos, Delphi, Marelli and others.

Decat, OPF off and similar modifications are intended for motorsport and off-road use where the law allows it. The workshop installing the file is responsible for the use of the vehicle on public roads.

How to order

Register in the AUTO-REMAP file service, upload the original read of the ECU, tick Full decat / 2nd lambda 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.