:)Problem found and fixed! A corroded connector at the passenger side (UK) height sensor. Sometimes it worked and sometimes it didn't. Replaced the sensor and connector and all seems to be well. Local non-franchised Landy centre found it with the innevitable computer tester.

Thanks eightinavee, I'm coming to that conclusion, just wanted to be sure I wasn't overlooking anything simple or obvious I could do myself. The way the vehicle's behaving at the moment I'm not sure I want to drive it the 30miles to my nearest trusted garage with a testbook until I'm sure I have...

Thanks battenberg, that's a really good link, I'd found this one: www.discovery2.co.uk / Rear Suspension Air Bags As you suggest, soapy water comes next. Do you know how faulty height sensors show themselves, do they fail completely or intermittently?

Hi folks, I'm new to Landyzone so I'm sure this topic has been covered before. I did a quick search but couldn't find an answer so here goes. I replaced the air springs with new ones last year and the system has been fine until now. Three times now the back has dropped evenly on both sides...