Squeaking sound when turn the steering

[basilekhara]

Just bought the car for two weeks and found out there has some squeaky sound when turning the steering , would that be the ball joint problem ? Mercedes-benz C250

 

[mattkh]

......some squeaky sound when turning the steering

Which way, when turning right or left..?

 

[brandwooddixon]

Is the noise only heard inside the car or can it be heard outside?

 

[Oldspanners]

Here's how to isolate it, worked for me.