Steering Noise
 

I have a 1999 E320 4matic with about 85,000 miles. I recently noticed a groaning noise that seems to be coming from the steering column when the wheel is turned left or right. Any ideas? Thanks.

Sounds elementary, but did you check your power steering fluid?

lower ball joint

if it is a dry ball joint grease can be squirted into the boot with a needle attachment to your grease gun.

this is a good temporary fix as long as the ball joints aren't loose.

tom w

The 210 chassis has been plagued by a variety of steering issues. As previously posted, check the P/S fluid level and front end components first. If all is good, MB has issued DTB's concerning three separate steering noise issues, depending on your cars' VIN. They are as follows. 1. An updated pressure hose. 2. A modified sealing boot between the firewall and steering shaft. 3. Replacement of the radial shaft seal inside the control head of the steering rack. They're all inexpensive repairs if you DIY, but replacing the radial seal requires some rack disassembly.

Numbers 2 and 3 make nearly identical noises, but the way to differentiate between them is easy. You say that the noise occurs when turning the steering wheel back and forth? If the noise is present only when the engine is running, the radial seal is the problem. If the noise occurs with the engine off, it's the boot at the firewall. Let us know how you make out.

Sterring Column Noise
 

The noise occurs with both the engine running and with the engine off. I guess I have both problems 2 and 3.