It being a bright warm day for a change I decided to have a look at the leveling sensor, and further investigate the knocking from the N/S/R corner.
The sensor was pretty easy to spot even without the colour coding.
I removed it, and could see nothing obviously wrong. So I gave it a squirt of De-Oxit5 and greased the linkages.
How to test it ?
I started the car, put the headlights on low beam and made a mark on the garage wall where the top to the beam was.
I then needed to put something heavy in the boot. As 'er indoors was out shopping I settled for some paving slabs and a heavy toolbox.
I then switched the headlights on again and noted that the beam was now quite a bit above the mark I had made.
When I started the engine the beam slowly came down to the position I had previously marked.
So, now I have confirmed the auto-leveling is working if the beam is still high then some manual adjustment of the lights themselves will be needed.
S.