Hi. I have a C4 Picasso 2008 and I have overhauled the brake system. I have a diagbox kit and decided to recalibrate the park brake as there was some slack in the cable. The problem is I cannot seem to finish the calibration procedure. I now have a C155A fault "handbrake not calibrated". It was ok before I started the calibration so I don't First step was to replace the brake switch, but to no effect. Second step was to remove fuse one from the engine bay panel (BSI), scrape the holder blades and clean the tarnish off the fuse. That seems to have fixed it. Despite the box having a tight cover there was a lot of dark grey dust in it. I took it to the Citroen garage and they "reset" the software, but this did not resolve the fault. I read elsewhere on the forum that the reset needs to be done when the car is cold. So I brought it back to Citroen and they said they loaded "new" software (but they still did it while the car was warm despite my concern). My car is now worse! Citroen Pneumatic Suspension [C4 Picasso C4 Grand Picasso] There is much talk about this problem. No doubt you have already trawled the net for a glimmer of hope - like many others, to little avail. The pneumatic system as employed by PSA on these vehicles is sadly fraught with problems. Fully synthetic oil is most highly recommended for the Citroen C4 Grand Picasso, with diesel and petrol variants being recommended 10W-40 and 5W-30 also being suitable. What is the oil capacity for a Citroen C4 Grand Picasso? The oil capacity of your Citroen C4 Grand Picasso varies vehicle to vehicle due to model series and engine size. Re: C4 Picasso under bonnet fusebox. by RichardW » Wed Nov 05, 2014 12:53 pm. @ lighty, interesting info from service.citroen: Part Number Description Quantity Price excl. VAT Price incl. VAT Total incl. VAT Selection. 00006500FG FUSE BOX 141.61 GBP 169.93 GBP 169.93 GBP. 3.1-While driving. When the ESP warning light comes on when you are driving your Citroen C4 Picasso, do not worry, this is normal, it informs you that the ESP device works in particular when you take turns. The sensors send data to the computer which will analyze them and, if necessary, activate the electronic assistance systems. Hi, new the forum. Hope someone can help me. I have a 58 C4 Picasso, a few warning lights have come on, first service light followed by ABS, ESP, auto handbrake, and gearbox fault. The car will not stay in auto and will only go up to 3rd gear in manual. Please advise. Dave_Retired. Dave_Retired. ZheU26.