OK i was in Tamworth this weekend. My brother was driving the car buy himself and hit a rock that punctured the inner side wall of the tyre. (ill take a photo tomorrow.) He said the light didnt come on when that he saw. Also when i changed the tyre with a spare which was new and the cars on there were 9000kms old the car still didnt tell me one was different. (the manual says it can tell when one is low buy the rolling diameter of the tyre by the ABS sensor.) Now what has everyone else experinced have you seen it work or is it just a Gimmick?