Steering Knock

[Pixo-ntec]

Hi all, just wondered if anyone has experienced a regular knock from the steering column on the Pixo? ours does it if you attempt to turn the wheel just as you're pulling off from stationary to do a turn, been reported to the main dealer on both service occasions and both say they can't find anything wrong, but as soon as we get the car back we can make it do it almost straight away, and it is quite a loud knock too not exactly unnoticeable.