корвет

Some sources state you should change the sensors every 100,000 miles for better MPG, performance, etc.

Is this true even if you get no O2 sensor related codes? Can a sensor still be in need of replacement even if it is within the ECM acceptance range?

Thanks!

don hall

According to the following article, a change is recommended 60k to 100k miles. 02 sensors are relatively inexpensive, and replacement labor is about 30 minutes, so there is little reason not to change them accordingly:

http://www.oreillyauto.com/site/app/...icle=800732802

WW7

I believe the main problem you will have with O2 sensors is they get fouling buildup on them from being in the exhaust flow, which makes them less accurate and sometimes not very responsive.. Like Seabright mentioned above, they are fairly inexpensive at around $35.00 so changing it every 60,000 miles is just good insurance........WW

Klyde

I recommend changing the O2 sensors every 60k miles also. They gradually shift output voltage over time and the EMC changes the injector pulses to compensate for it. The EMC is shooting for a fuel mixture that it thinks is perfect, which it gets from the O2 sensor voltage, when in reality its way off. You will of course see no codes because it thinks things are fine until they get so bad it can no longer compensate. I also recommend changing out or at least having the injectors cleaned at the same mileage. Changing plugs, injectors, and O2 sensors all at the same time (60k) really makes a huge difference in the way the car runs and the gas mileage the car gets.