A lambda/decat file disables the second oxygen (lambda) sensor monitoring, used after a catalytic converter removal (decat). Applied on motorsport vehicles with a decat or sports exhaust to avoid the P0420 catalyst-efficiency fault.
For workshops
With MasterTuning you request the file, we produce it custom to the vehicle, and you flash it back — no in-house tuning required. You keep the customer and the margin.
Legal note: emissions-related deactivations are not road-legal in the EU/UK and are intended for off-road, motorsport, agricultural or export use only. Always check local regulations before use.
FAQ
What is a decat/lambda off?
Disabling the post-cat O2 sensor check after removing the catalytic converter.
Is decat legal?
No, road-illegal in the EU/UK; motorsport/export only.
Offer this to your customers: find the vehicle or contact MasterTuning for a custom file.
