Couldn't find any info on the problem and can't solve it either as the easiest method - throwing money at it - is not available ) Anyhow, about 3 month ago started getting parking sensor failure messages when trying to reverse (and a constant buzzing noise obviously) - at the time fault would normally clear after a couple of seconds and all starts to work.. Eventually though failure became permanent (and it's the buzz that's really getting to me - system is factory installed so just removing it won't be a good solution + am too used to them sensors - stilo has some amazingly big blind spots and once i have been unable to see a child and a person that has managed to trip and fall behind me - but sensors did! as far as i'm concerned these sensors save lifes..). Ok what i have tried - connection under the bumper (no issues there), got me local to hook it up a fiat diagnoster - came up with rear right sensor internal failure.. now to the problem: easiest way to check if sensors are working is to listen (they click every second or so - just like a sub ) all 4 seem to be working... which got me thinking - perhaps the system is just unbalanced an needs to be retrained can only guess that this is possible to do (for me that is as i’ve only an elm interface) by unplugging and plugging back in a ‘faulty’ sensor or find a replacement one at the local breakers (and for the first time with me stilo it appeared easy to do as you can get to the sensor without removing anything - the hole lower side of the bumper is big enough..) but i can't remove sensor plug (wiring) there doesn't appear to be any catches and just pulling it doesn't work .. elp pls