o2 sensor.... is it working right?

[kreepscort]

Hey everyone, I think my first o2 sensor is bad, for one thing my check engine light is always on and also my Autometer Air/Fuel gauge is always on the first LED and has NEVER gone past the 2nd LED. If theres any other way to test if its the o2 sensor please let me know. Thanks in advance for any advise.

 

[turboholic]

http://www.geocities.com/MotorCity/Downs/7678/dsmtests.html

 

[kreepscort]

thanks for the site, but now how do i actually DO the testing? Do i need any special tool? thanks again.

 

[turboholic]

-You need a multimeter, get the digital one, not the analog one.