I would hazard a guess at the clutch. On inclines, especially in reverse, the clutch in the 159 would let out a right old pong. Didn't feel it slipping, but certainly stunk.
The ASR in the 159 was always pretty reluctant to kick in on mine, rather laid back!
I was going to say I can get a Saab or Golf's DSC to kick in pretty quickly...
I think the ASR light has appeared on mine twice since i got it...it just seems to sit there and go..heyyy yeah you can play a little more, i'm not going to reign this in just yet...i think about it maybe after my latté.