Oxygen Sensor Life Expectancy?

[Jet-X]

Closing in on 90K miles and wondering if I should be pro-active and replace these parts before they fail?  I recall in the past, most people would change them out at ~80K miles. 

[Black02Silverado]

No need.  They last a long time and I would wait until you get a code showing that they are bad. 

[dsr611]

No way to know if they are about to fail unless the CEL light comes on and gives you a code for the sensors.

Still have the original O2 sensors in my wife's 05 Tahoe with close to 275000 miles with no problems (other than when the dog chewed the wires going to one of them).  Tahoe still runs great and would get 18+ mpg if my wife's right foot wasn't so heavy.

She had an 01 Accord, purchased brand new, and had 1 of the O2 sensors fail after about a year and a half and less than 20000 miles.

 

[Jet-X]

Thanks for the input guy's.  I had know idea they would last that long.