Dear Motortalker, I have a riddle for all citroen and/or air suspension experts: our 2008 C4 Grand Picasso 2.0 petrol engine, approx. 150,000 km, has been sagging again and again since recently. But it is not clear what it might be like. It’s up to my hair… Here I have summarized the most important findings: 1. it doesn’t always pick up, and it is absolutely confusing: at home it sucks off about 50%, at work at 100%, when shopping never (really!) – and it’s in all 3 falls. I’m going crazy! 2. He’s always sitting on both sides evenly from 3. Sacking happened “over night” at first. So at some point after many hours he was down. Meanwhile it’s when he sucks off so that the air goes out directly when parking. So even when you get out, the ass is chopping down OR you still hear air escapes. 4. The pumping up usually only passes when the engine is already running. Sometimes even when you roll off. That means it’s s 5. It is definitely not related to the weather. Does anyone have any idea? My regular workshop is not a Citroen professional and it is going to do a huge diagnosis for a lot of money as I know it. Blasebalge is unrealistic based on this strange behavior – as is the compressor, but it is even more so. Or? Is there a valve or a sensor that could spin? I am happy about anyone who has anything to do with it. Please help me before I go to the workshop without any idea. I thank you already in advance and keep my fingers crossed.