I recently was driving and then my car just randomly popped up with the check engine light, check vsc, and the traction light came on. The car runs fine but, i have to replace the heated oxygen sensor, but I can not find it. Does anyone have a detailed diagram of the is250 engine or know where the sensor is located?

btw I do not have the owners manual

 

Which one, there are 4 sensors in total. Either it is in the header, or down-stream in the "downpipe" closer to the secondary cats.

 

Bank 2 sensor 1

 

I believe that passenger side primary on the header.

 

I forget which bank is which, but it is definitely the upstream (in-header) O2 sensor.