Changed the bulbs still no luck  RRS SUPERCHARGED, 22 INCH ALLOYS, JAVA BLACK, FULLY COLOUR CODED
EVERY POSSIBLE SOFTWARE UPDATE INCLUDING - BLUTOOTH UPDATE, SATNAV ON THE MOVE, CLOCK ON DASH, 3 CLICK FLASH, GEARBOX RESET, COMPRESSOR UPDATE AND SUSPENSION LOWERED,
BLACK CODE RE-MAPPED, AUTOBIOGRAPHY'D, NEW EXIDE BATTERY, NEW DENSO ALTERNATOR

I had the same warning on mine. I changed the brake switch, bulbs and had a new battery all to no avail. Turned out there was a dodgy ride height sensor. Once that was swapped for a new one, No more faults appeared. Although I have noticed that I do get the HDC inactive fault flashing up if the battery charge has dropped a bit..... Very sensitive to voltage drops these Range Rover's.... 2008 Supercharged Stornaway Grey, 22inch black Stormers
Full led light pack, HST front grill, black lettering....
Great to be back on Petrol.....
Mini Cooper SD......New arrival
Nissan Navarra....gone
Mercedes C320 cdi...gone
Mini Cooper D....
Subaru Impreza Sti....gone
Land Rover Discovery....gone
Many more over the years...all gone...

I do get the right drivers side wheel light flash red on the 4 x 4 screen only when I park my car round the back of my house which has a uneven level but only in that position, everywere else parked or driving the light disappears but this has been like this ever since I've owned the car an car sits level in all height positions but may still be worth changing.

Was it quite easy to replace? And how much was the ride height sensor? RRS SUPERCHARGED, 22 INCH ALLOYS, JAVA BLACK, FULLY COLOUR CODED
EVERY POSSIBLE SOFTWARE UPDATE INCLUDING - BLUTOOTH UPDATE, SATNAV ON THE MOVE, CLOCK ON DASH, 3 CLICK FLASH, GEARBOX RESET, COMPRESSOR UPDATE AND SUSPENSION LOWERED,
BLACK CODE RE-MAPPED, AUTOBIOGRAPHY'D, NEW EXIDE BATTERY, NEW DENSO ALTERNATOR

I wouldn't know what the 4x4 screen should display as mine isn't working and nobody can tell me why! The sensors are about £50 each and are simple to swap, 2 screws and an electrical connection to unplug. I only changed 1 and all was ok. 2008 Supercharged Stornaway Grey, 22inch black Stormers
Full led light pack, HST front grill, black lettering....
Great to be back on Petrol.....
Mini Cooper SD......New arrival
Nissan Navarra....gone
Mercedes C320 cdi...gone
Mini Cooper D....
Subaru Impreza Sti....gone
Land Rover Discovery....gone
Many more over the years...all gone...

Matford LR were doing full kits of genuine D3/RRS height sensors for £30 on Ebay. They don't seem to be there at the moment though.

NB: You should have the suspension re-calibrated if you replace a sensor.  Visiting from DISCO3.CO.UK
2006 Discovery 3 TDV6 Auto HSE Zambezi Silver