Just disables it, as far as I know
S&S has a mind of its own and rarely works on my car, when you would expect it to
Quite stupid really. when the whole idea is that whatever your driving style, it should work to avoid pollution
TBH...Its a gimic and designed to get around the emissions
I notice when I press start (keyless) and the pre-flight dashboard symbols appear, one in orange is Service with the tyre pressure symbol. (goes out after a few seconds) Is this normal or is trying to tell me something.
Normal - it will remain illuminated if there is an issue plus you get a warning come up in the central display briefly.
If you ever want to be sure just briefly press the dashboard odometer reset button (to the right of th instrument display button) and it will show all four tyres as green with 'OK' next to them, it also then cycles through time/ distance to service, Ad Blue time/distance (for those of us with diesel) and finally a check of the faults.