When driving at slower speeds or cruising on the motorway, the steering feels nicely weighted and all is good. If I put my foot down the steering goes very light and will stay light afterwards for a while and then gradually weights back up. Driving at high speed and the car feels very twitchy and it needs constant correction on the steering to keep the car straight. Its very sensitive to steering inputs.

I've had it the tracking done, checked the bushes and all appear ok.

Any advice on how to sort it would be welcomed.

Yeah mine feels the same! and ive got new poly bushes and had 4wa done. ?

I'm the same, new poly control arm bushes. Is the steering on the Octy speed sensitive? I'm just wondering if there could be a problem with the pump over boosting.

Has yours been like it since the poly bushes where fitted?

No it was doing it before. I fitted the bushes thinking it would cure it, but its not. I thought there might be a few people on here who had come across the problem. I've searched on the subject but can't find any answers.

Im not 100% sure if it is speed sensitive, dont think it is.

There is a pressure switch in the top of the PAS pump, but I thought that was only for full load at idle to stop it stalling.

I'm pretty sure the system on the A4s isn't speed sensitive; certainly it's not on the Elegance.