Q7 suspension problems, help!

[K13 ASJ]

I'm away at work at the moment and one of the lads is having a problem he can't get an answer on:

He has a 57 plate Q7 with air suspension.

At the moment he can cyle through all the ride height settings but the NSF (drivers front) won't move an inch. All other corners go up and down, NSF nothing.

He's had a disgnostic on it and has been told "its a sensor". using Bosch machine got the code, 01be?

Before he takes it to Audi I thought I'd ask on here, anyone got any idea's?
All help/ advice welcome.

Thanks in advance

 

[ScottD3]

Could be a sensor or the air valve leaking.

Is that side lower than any others or its stuck at its current height?

 

[K13 ASJ]

It is sitting lower on that corner. On MMI its set on comfort mode but the nsf is sitting lower than the others.
If he changes the settings on the MMI suspension modes, all others go up and down.
There is also a amber suspension light that flashes on and off after driving around 500 yards.

 

[ScottD3]

My only experience with air suspension is on a tourage.
It had the same issue of sitting low on one side and it was the valves.
They started to slowly leak and got worse over time, had the errors on the dash as well.
The sensors was fine this time.

You should be able to hear it leaking but if you spray some soaping water on the valves you can tell by the bubbles.