3 days ago · The most common fuel consumption issues in the Citroen Grand C4 Picasso are poor fuel economy on diesel engines and excessive fuel consumption on petrol engines. These issues can be caused by a variety of factors, including a clogged air filter, worn spark plugs, or a malfunctioning oxygen sensor. In almost 20 years of Citroen ownership I’ve found the posts and advice on the forum really useful in helping with common minor issues, but now I actually need some help with is looking like a big issue! The car that is causing the problem is a 2012 Grand C4 Picasso 2.0 HDI with around 80k on the clock, owned from new. Joined: Thu Nov 16, 2017 10:07 pm. x 2. Re: 2013 C4 Pic 1.6 diesel not starting. by Rosanbo » Fri Nov 17, 2017 9:15 pm. Hi, The AA guy said it was a fuel problem, either a blockage or fuel pump. The AA guy asked to see my fuel receipt it does say diesel. He had a suction device and sucked the diesel through at the rail, but nothing came Vocational, Technical or Tra 28 satisfied customers. I have to open manually, but I cant get the petrol cap open..lever. Hi! Strange one this, my electronic key doesn't open the car anymore so I have to open manually, but I can't get the petrol cap open ! I need to fill her … read more. The turbo failed on my C4 Picasso. The car is 4 months out of an approved used car warranty and the dealer has told me they have received notification from Citroen that the problem is due to a known fault. The dealer has requested a contibution for parts but must still charge me £1200 labour. This is £800 for the turbo replacement labour and another £400 to replace injectors. However Citroen C4 and DS4 Online Support with user help forums, FAQ's and Technical guides Forums:: C4 Picasso and Grand Picasso - PRE 2013 I'm having a problem You can reach fuel pump/gauge by lifting rear passenger seat, under the carpet, from the large circular hole I can send a picture from mine (petrol, mk2) but I'm not sure if it's same in diesel models. Fuel hose connectors were easy to disconnect (if you know the technique, see pic below) and easy to refit. Hi. Well, I've done everything I can to rectify this problem. The car when started from cold will quickly start smoking usually white smoke this can get quite bad leaving a big cloud behind the car a quick dab of the accelerator and it will stop but slowly come back again until after a few minutes the car is warm and the smoking stops altogether. 1npxLi.