Lambda / O2 Off

Disable O2/cat monitoring after a decat or sensor change.

Also known as: o2 off · o2 delete · lambda delete · oxygen sensor off · cat delete · catalytic converter off · rear o2 off · downstream o2

Lambda-off (O2/cat delete) disables the rear oxygen sensor and catalyst-efficiency monitoring in the ECU so a decat or sports cat doesn't set catalyst-efficiency codes or the MIL. Front (control) lambdas are normally kept for correct fuelling. It's an off-road/track change tied to exhaust hardware.

Can Softechpro do Lambda / O2 Off?

Softechpro Solutions applies emissions/diagnostic modules (DPF, EGR, AdBlue, DTC off, swirl flaps) automatically and supports Stage power and character features via credits, correcting the checksum across ~1,400 firmwares — on Windows & macOS.

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