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@thegreck - first, I totally agree that under normal riding most peoples feet move around a bit and one(or both, oh no) of the sensors may go off from that. My theory was that you would ride with the intention of testing the sensors, so get your feet into a decent position and leave them there. Ride fast, slow, go over a few bumps. Basically riding with the intention of keeping your feet firmly on the sensors and then check to see if they behaved the way you thought. If you start to see abnormalities then you could look into replacing pads instead of just replacing them every X amount of time. For all we know the pads on the board are fine and they could be replaced with a new defective part causing a problem instead of solving one.
My thinking was that over .5 MPH only one sensor is required to keep the OW alive. If you could catch one doing things that seemed odd you could replace the pad before you run into a situation where one sensor is intermittently failing and the other turns off from leaning/moving feet.
And yes I agree that its hard to know if the senor turned off because of a failure or because of movement but if you did the test a few times, paying attention to your feet being on the sensors a pattern may be able to be seen.
Honestly I've never had an issue with sensors my self, I was just asking cause of what i read in another tread.