Just curious about it. I'm not having any problems, and my car passes emissions like it runs on rainbows and sunshine, but 150,000 miles is coming up and I do wonder how long an O2 sensor typically lasts.

Has anybody here replaced the sensor, and if so why and at what mileage?

 

I replaced mine last week, 9 years old and 69k miles.

I replaced it bc car devolped a bad hesitation at anything but WOT.

 

Secondary failed at ~135K. Odometer reads 155K now, and still no problems with the primary.