Hi, I have an issue with my 2008 Q7 where ABS kicks in (mainly at slow speed) and car either shakes or fornt wheel feel like they have locked up and refuse to move, its very scary and thankfully only has happened at slow speed.

Took it to an audi garage, they changed a speed sensor for the front passenger side tyre, but that did not fix it, took the car back in again they replaced the bearing and harness wire. That has not fixed the problem either, recovered the car to the garage today and they will get back to me by tomorrow.

Oh when the problem happens, the ABS/Traction and transmission lights come on and either ABS Failure message or Hill Start failure message shows up.

Audi have had the car twice for a week each time and have not been able to fix it, so I am getting really concerned. I would really appreciate if someone else has had similar issue and can share their experience with me or have an idea what it might be.

Thanks for your help in advance.