How to check if 02 is pooched

[oldskool3]

Is there any way to check if my 02 is in need of replacing? My car is running super rich and I would like to start eliminating possibilities. I have no idea how old it is and I am thinking it may be the culprit. It is a m20b25, 272 reground cam, hollow cat...

[Adrian_Visser]

it's been covered. Just type in 'oxygen sensor testing'

you might find something like this:

http://www.r3vlimited.com/board/showthread.php?t=81659&highlight=O2+sensor+testing

[nando]

if it's more thank 50k miles old, it's probably dead.

[oldskool3]

it's been covered. Just type in 'oxygen sensor testing'

you might find something like this:

http://www.r3vlimited.com/board/show...sensor+testing

That wasn't helpful at all ;) Thanks very much!