Speak with CC or one of the good independent dealers, this is a well known issue. The odd thing is that it happens on some cars and not others. As I say, I had it on mine. Real time data can be obtained from the OBD port with Easymap but no fault codes although it might throw up a couple of dubious codes - this appears to not be unusual either. Have a look through past posts, this issue has been mentioned a few times.