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im not sure in other people case but i have no light come on with my decat
i haven't fitted the 2nd lambda sensor just unplugged and removed it as a little experiment at work to see what would happen so far nothing and i have done over 1000 or so
Engine management light will come on after a while, could be a week, could be half a year before it does. Unless you use a plug spacer, or bung it and secure the sensor under the car.
I've had mine decat on nearly 2 years iirc, lights never been on once , and I have a sensor fitted and plugged in, no bung , I've found it tends to come on if people use 95ron fuel, everyone I know who runs 98ron and decat has not seen the light , maybe conisidence though !
I've had mine on 18 months..
Came on after 12.. Then went away again after a couple of days.. Been on once or twice in the last 6 months but always disappears
Also with regards to the above I run mine on 95 mainly but occasionally treat it to 98.