Hi
I've had the same problem in my 206cc - 2001 every time i went faster than 60-70mph.
About a month ago i took it to my Dealer and they realign-it. It took 2 days just to test it, realign and test again but now everything is fine!
They told me that i wasn't the first one with this problem, and that's why they knew the time it was going to take.
Since they know the problem here in Portugal, it's fair to assume, all the Peugeots know about the problem right?