I've fixed the 4mo warning light that I've had on the dash for about a year. I've previously done loads of data for mmi and we thought we'd narrowed it down to a wiring issue.
I've had the haldex controller off, cleaned all connections and even pulled the unit apart to check for water ingress.
Anyway, today whilst at the park as there was only me there I decided to check the haldex function (even though it passed the test in VCDS) by dropping the clutch at 2500rpm on the loose gravel car park. Small amount of front wheelspin followed by a big rear wheelspin and two big lines in the gravel - and hey presto the warning light went off immediately and hasn't come back on.
I'll scan it later just out of curiosity, but hopefully it was just some sort of calibration issue making it throw a wobbler.