Oxygen Sensor DIY?
 

Howdy guys,

My 2002 3.0 hit the 100k mark and was wondering if anyone replaced the 02 sensors in their X5? From my understanding, there are total of 4? 2 frnt/2 rear? Should I just replace the 2 frnt?

Thoughts?

too expensive to replace as preventative maintenance in my opinion. if you decide to, or need to you'll want the bosch special tool to make the job easy, and some wd-40 or something cause i'm sure those bad boys are locked in place.

and yes, there are four. two before and two after the CATS