4. Posted May 28, 2015. Dears, In my Citroen C4, 1.4 petrol (hatchback 2004), just a few seconds after I start the car the message "depollution system faulty" appears on the screen and the engine management light stays on. For most part the car behaves normally, expect that now in low revs (for example behind a traffic light) it jitters and citroen c4 grand picasso - citroen fault - Collos25. You need to take it to a Citroen agent who will either clean the DPF and refill the Eoly tank (if its got one) or fit a new DPF and refill the Eoly tank then turn the warning light off and charge you the earth.If you are technically handy you can change the DPF buy the Eoly oil of Ebay and

My citroen c4 1.4 vt keeps saying STOP OIL PRESSURE TOO LOW,but the car still runs and sounds mint, can any 1 help as im trying to sell the car and is putting people off, cheers Posted by Anonymous on Jun 02, 2014

Car won't start and it's been traced to a faulty relay controlling the fuel pump. The diagnosis looks good as there is no power going to the fuel pump nor across the terminals of the fuel pump fuse location (15a position number 5 from memory). I'm broke and as it's a plug and play module that not only houses all the fuses plus the all the
Engine bay fuse box is a common problem at the minute, mainly affecting the new C5, but also C4 Picassos. I'm surprised that they hadn't heard of the fault code P0001 and linked it straight away to a faulty fusebox. The fault is a poor or faulty contact inside the fusebox on fuse F1 which breaks down overtime.
Hi my Citroen C4 Grand Picasso 1.6 HDI Automatic has started to become unreliable (104,000 Km). Last week for no known reason the engine cut out whilst I was driving along at about 75 km/hr. The "anti-Pollution" fault light came on when this happened and stayed on. I restarted the car and drove home.
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citroen c4 anti pollution fault reset