I noticed that sometimes after having steered into a corner the steering wheel does not come back automatically to it's central position but is a kind of stuck.

Luckily never too serious but I have to assist the steering to get the wheel back into it's straighline position.

Any ideas what the problem could be??

Tnks!

 

Have you checked the power steering fluid?
If it's fine to be honest, i'd limit my driving and visit a dealer ASAP

 

Get the steering geometry checked.

 

sounds like either a sticky valve in the rack, or a seized knuckle joint between the rack and column

 

Thanks guys, steering fluid and pump ok but once replaced the rack with a 2nd hand one so guess have to start looking there.