O2 sensor testing?

[Hozer 88GTConv]

I have a strong suspicion my O2's are bad. (car running wayyy rich, changed and checked everything else, fuel press 40 psi, injectors are good, grounded, no leaks.)

I don't want to sound cheap, but O2's are $40 a pop.
Also, I am anal.
How do I check these? I am guessing something to do with resistance on one of the wires.
I looked for values in my reference books but couldn't find any.
Also, check engine light is disabled.

Thanks in advance...

[Nixon1]

Even if the engine light is disabled, you should still be able to pull an ECM code to see if there's a rich or lean code floating around in the ECM's memory.

I dont know of any way to really test the O2....since these arent widebands, I dont know if testing them would be effective since theyre basically made to read only drastic differences in a/f mixture....like very rich, or very lean. I've run pig rich before, with brand new O2's, and they didn't throw a code. It takes a lot to make them go off....

It might be possible to CLEAN them, but....I've rarely heard of anyone doing this...

By the way....cheap + anal is a very bad combination.

[Hozer 88GTConv]

Cheap.
I wish.
I stopped counting after $20k invested over the last 5 years.
And yes, got the receipts to prove it.
Anal.

[Nixon1]

Wow......

Well with that much already invested...go ahead and do the O2's. It'll just be adding dirt to a mountain. Plus you can always do what I do....if they dont solve the problem, clean them up with some TB cleaner and return them.. Just be careful pulling the old ones out---they break easily.