On the Aero the sensors are attached just behind the valve with an allen key bolt.
I recently, and unfortunately, kerbed one of my wheels to avoid an oncoming car so had the tyre and sensor switched over to a spare wheel that I have. Sensor and car were kms apart for several hours yet all worked normally when the new wheel was put back on.
As someone else has said, you can access full manuals on the system, which are no longer sold for cars, via the Smartire website.
On my S1 I've had just one false alert in 2 years, otherwise system has been totally reliable. If though Smartire don't make, nor support, the system for cars anymore it might though suggest they had many issues.
Cheers
