Hi,

Just wondering when do I need to replace my suspension on my 04 TL. The car current has 122,000 miles on stock suspension. What are signs I need to be aware, before making a purchase? thanks

BTW I bought the car used, so I did not have the car of its entire life span

 

Depends on location, climate, roads driven, etc.

However, since you are not the first owner, I would inspect them first

http://www.wikihow.com/Inspect-Your-Suspension-System

 

Visual inspection, unusual noise, excessive body roll or bounce. Suspension parts, especially dampers are under near constant use and assuming they are the originals, it is probably time to take a look at replacements.