Hi guys got a mad one here my power steering suddenly goes tight and stiff intermittently not always when it go tight it soon goes loose again once I force it to turn this doesnt happen at certain speeds either its a Radom one could it be my fluid as I checked it and its a dark brown colour!
Cheers Range Rover Vogue SE 4.4 SDV8 SVO Stying Pack
Audi A4 2.7 TDI S Line Black Edition phantomn black
Previous Cars
Range Rover Vogue SE Overfinch Styling 22" Elara's full black stealth colour coded
Java black Range Rover sport 2.7 TDV6
Alaska white Range Rover sport overfinch 3.6 TDV8
BMW M3 Carbon Black

Servotronic valve the likely culprit, worth a search

Mr Tee's right. If not that it could be the BCM intermittently failing (it's under the Pax seat).

To be fair I know about the BCM issue as my car is experiencing that as with rear doors don't open sometimes and the steering is very heavy when both doors don't open also.I can bypass this by quickly turning ignition on and off. My issue is that I get intermittent heavy steering when driving sometimes light and sometimes heavy resistance. When I rev engine at 3000RPM when stationary I still get this issue turning left to right full lock intermittent heavy resistance. Range Rover Vogue SE 4.4 SDV8 SVO Stying Pack
Audi A4 2.7 TDI S Line Black Edition phantomn black
Previous Cars
Range Rover Vogue SE Overfinch Styling 22" Elara's full black stealth colour coded
Java black Range Rover sport 2.7 TDV6
Alaska white Range Rover sport overfinch 3.6 TDV8
BMW M3 Carbon Black