How to test 02 sensor to see if its bad

[lvega@bellsouth]

was wondering if there is a way to check an 02 sensor to see if its working properly on a DFI set up? Thx

 

[zam70]

Repalce it with a new one. If everything reads the same, the old one was fine (HAHA)
Seriously, there is no way to check it. If your O2 numbers are wacky or the car is running really rich or lean, the O2 could be bad.

 

[gofstbuick]

Most O2 can be check for lean and rich bias and response time. It requires a labscope, digital storage oscilloscope, or graphing multimeter.