How long do oxygen sensors last?

[Natty]

I just noticed that PDM says you should change your oxygen sensor about once a year, since they are prone to random failure.
Is this true? I haven't heard about this for the KA, or any other car for that matter.

[twitchy]

ive been told you should change them "every so often" even if the engine light doesnt come on....My mechanic says that on the KA engines the O2 sensors can be f**ked up and the light wont come on and it kills your mileage. Im planning to put a new one into the header im getting. That as well as a wheel alignment and some new plugs / wires should make the mileage way better

[Natty]

Man, I never knew about this. I guess that is why I am running rich with shittiy mileage, black smoke (barely any) and a bit lower performance.
I never replace the o2 sensor because the check engine light never came on. D'oh.
Thanks :goyou: