I bought my 2004 TL used with approximately 72K miles on it.
I've had it for a little over 2 years now and have noticed some issues arise.
After looking at other TL's it seems that discoloration in the side mirrors is pretty common with this model.
I have also had to replace my O2 sensor after failing an emissions test.
Just recently my passenger side headlight went out.
I have no idea why they built the car like they did but in order to replace either of the headlights(not fog lights), you need to take the bumper off the car making it close to a $400 job ($200 for the headlight & $200 in labor).
It's still a great car but can be a little costly to fix at times!
Will check in again!
Great interior, excellent power and features
Need to fix the headlight replacement issue so you don't have to take the bumper off to replace a bulb!!!!