How often do you have to replace the O2 sensor?

 

Usually a very long time, in the 90-100K range at least. Unless your engine burned oil for a time, you drove around with a bad pcv valve for a while, or blew a headgasket along the way and allowed radiator fluid to fly through the engine into the exhaust.

O2 sensors do not like oil or rad fluid whatsoever and die very quickly.

 

Thanks for the info

 

I beleive most mfgs. have a replace recomend aroud 85k, so if your at more than that and having issues, it's not too expensive to throw a new one in. You might want to use a tad(dont let any get on the sensor itself) of Anti Sieze compound on the threads when you re-install the new sensor.

 

Adding to what 94F150 said, make sure the anti-sieze is O2 sensor approved. Last time I replaced my O2 sensor, it came with a little plastic pouch of anti sieze.