Selflevel. susp.inact error E53 3.0D 2005

[tojjm]

Hi all,

I have seen other posts about this fault, but they don't help with my issue. One day the fault came up, but once you switched off and on it went away, eventually it stayed on, rear suspension did not go down. I googled the fault and there was a lot about the pump piston ring worn, so I removed the pump and wired to switches to turn pump on and operate the solenoids, pump worked suspension went up, after about a month the rear of the car went down and damaged a air bag so I replaced them, I got a copy of inpa and used it to operate the pump and raised to the correct level. Then I read about the module down the side of the battery, checked it out and yeah it was full of water, I bought a used working module and installed, still had the fault, cleared all faults with INPA but fault still showing on the dash. I then replaced both level sensors on the back suspension, fault still on dashboard, took it to the garage for them to clear faults, they reported there were no faults showing. At the moment every 4 months I have to connect with Inpa and pump the system up.

Can anyone help? Have I missed anything? This has been driving me mad for over a year