I bought a 54 C5 facelited exclusive three months ago . Been real pleased with it .Only a couple of slight electric niggles .The heater had a habit of setting to Min when the car was stopped , but that seems to have cured itself . The other has been parking sensors , they're notorious apparantly for giving up due to water damage . As I didn't pay much for the car , I decided to give it a treat and take it to Arnold Clark citroen to get its sensor/s fixed BIG MISTAKE !!! They charged me 120 for the diagnostic , and 72 for two sensors , and 50 to fit them . Then guess what ?? Driving away from the said dealer BEEP "parking sensor fault" was the message on the screen . I drove straight back and entered into a debate with them about the situation and the bill ,which is still ongoing. I've since found an independent Citroen garage now , when I was in for a small service he read the codes and said the the only fault was parking sensors x 2 and told me the positions , he didn't charge me for the info' . The sensors are £70 from the dealer so I wasn't interested to start with , but I started searching on the int' and found one Citroen part No; 6590A5 which I bid for and got for £5 , and two 6590F6 Peugeot part No ( exactly the same but in grey primer ) for £ 24 . They are dead easy to fit ,all the rear ones can be accessed with no need to remove the bumper ,just removing the the soft rubber under tray . The two inner front ones just pull out on their own housing .The two outer front would need the bumper removed , but hardly a massive job . Moral of the story , steer clear of dealers , and shop around for parts ...I really should have taken my own advice to start with !!! Boy I really love my C5 though , makes the Volvo S60 I had look bad . I paid more money for the Volvo , had lots of expensive issues with it .The Citroen is a much nicer drive !!! Jack.