P38 suspension problem

Firstly, my apologies if this thread is a replica. I have what seems to be a reasonably common problem with my EAS, but I cant find a specific answer.

My suspension drops at the rear overnight with the rear passenger turret sagging further than it should so the whole car looks drunken. However, if I lock the suspension before parking up, I have no problems at all. Indeed I left the car locked on 'high' and went away for a week and it had not lowered at all on my return.
Presumably therefore, there is not a leak in an airbag, so I guess the problem must be with either the height sensor or the EAS unit itself. If anyone can advise as to the most likely fixes for this is I would be very greatful.

Locking it on High does not mean you do not have a leaking airbag. As the bag rolls under at the bottom, the leaks can be position sensitive. Do the soapy water test.
Also if you have a laptop, download the free software from www.rswsolutions.com buy a cable and read the faults. If you do not have a laptop, buy an EAS kicker from BBS which they say will also read the faults, or take it to a stealer and pay them to read the faults.

There are lots of things that could cause your problem from leaks in the valve block to the driver module or a height sensor.

Oh and welcome to the madhouse!

Thanks, I am having a look at his website right now! I will post any further info i manage to get from the vehicle. As much as i love the car, I do find the electronics a little less than logical, or indeed, intuitive!!!

Another thing to add, i am showing absolutely no EAS faults on my system at all. Which is very confusing. I did have an initial problem when i bought the vehicle in september when the EAS fault message would come on while I was holding on the foot brake at junctions whilst in drive but this has since ironed itself out completely.