Hello ! First of all I would like to congratulate you for the quite informative forum here. I am a proud (but often also concerned) owner of a C3 HDI 8 V BJ 2002 (the first model with the bright interior) On the clock I have now only 57000 km. That is why I had the first 45000 km a job which was quite far away (every day 160 km long distance) and now almost only short distances have to drive around the 5 20 km. This month again HU and AU was due. Despite my worry the car had passed the HU without any shortage. But what I had not expected was that I did not get an AU because the workshop could not be measured. They told me that they would not get speed information from the OBD and without speed data no measurement. That was a Free Workshop (ATU) on that I drove to a contract workshop and there they confirmed this to me. I should leave the car for 80 euros an hour that the error is wanted. That has I didn’t accept it at first. I also pointed out that there was a different method of speed determination (upper wavyness of the on-board voltage). I could not be told this. I then drove to a Citroen NIEDERLASSUNG again. There I described my problem and the serviceman immediately said: “This is not a problem of their vehicle but of the workshops where they were, with the older vehicles there was already an OBD but it was not standardized which signal and where these would have to lie” For this there would be an exception in which exactly this measurement by shaft of the onboard voltage is carried out. I now have an appointment for AU next week Can this of a confirm, has someone experienced this also already so? Have really no desire to put the car off in the garage only because nobody can make AU with me … Previous damage to my car: after 1.5 years of failure of the onboard displays, diagnosis : short circuit in the control unit for the return ahrsensoren (Guarantee) after 4 years high pressure pump electrically defective (pump in order but short circuit on one of the coils) ( COST 1300 EURO!!)