Hi all . After some info if possible , last night noticed after parked my 2006 s/c up in access mode the rear end was sat uneven ( maybe 4-6 inch) with the nsr lower . I checked on the 4x4 info screen and the little minus sign above that position flashes red , only in access mode . Whilst parked in normal ride height there is no issue. I have an mot tomorrow so ideal chance to get under and have a nosey . What I'd like to know is if it is the height sensor , when I replace it should I have the vehicle in a specific height mode , and also I have been told that disconnecting the battery before would remove the need to have the calibration done ? Any advise greatly received

If the height sensor is changed, it will still need the calibration doing, regardless of wherpther the battery is disconnected or not. Bodsys Brake Bible
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I wouldn't change anything.
Either live with it.
Or Calibrate it to see if it sorts it.