Double Dark Side! Diesel & 8P
Campervan where did you buy the speed sensors from? I had the ABS light on and diagnosed the problem as being my rear right wheel speed sensor. I replaced it with a sensor from Euro Car Parts as it was Ł30 cheaper than the same part from Audi!
3 months down the line and I started getting a clicking noise at the front of the car which was where the ABS pump was trying to engage at speeds under 5mph. I had this diagnosed and it turned out to be the right rear wheel speed sensor! I got uner the car and unplugged the sensor at the block conecter and the problem went away. I bought a genuine Audi part and so far so good.
If you dont have genuine parts I would purchase proper Audi ones even though they are Ł65 each they may well sort you out.