Hi, I recently purchased an 2008 C5 SX. I believe these models are not fitted with parking sensors as standard but they appear to be fitted to my car. Unfortunately they are not working correctly as they beep randomly eg when there is nothing around the car I can get anything from 1 beep to 20 in the space of a couple of seconds - it's seems completely random until you get very close to something and get a near solid tone. In addition I don't appear to have a button for parking sensors, as shown in the manual, so can't turn them off? Does this mean they are likely to be aftermarket? I intend to take it back to the garage but would an understanding of the issue before I do. Thanks