O2 sensor replacement and MPG gains

Hello,
My '97 Riviera has 125K miles and as far as I know, both O2 sensors are original. I get about 21-22MPG with my heavy foot and was wondering if replacing the O2 sensors would give me any noticeable MPG changes. They appear to be about $60 a piece...
Thank you.
Mikel

Hard to tell... 22 MPG sounds like heavy foot and winter gas.

Albertj

O2 sensors are the #1 oversold part in the industry. If the O2 sensor is working, it works. If it does not work, the computer will tell you so. In addition, sometimes the computer throws an O2 sensor code for a different problem (vacuum leak, leaky injector, etc). Usually the problem is NOT the O2 sensor to begin with.

Replacing the O2 sensor is not a preventative maintenance task. The OEM sensor is capable of lasting a very long time.

Derek,
I agree, but don't old sensors become somewhat "Lazy" in response time. There is also the heater element that can throw a code when they don't get up to temperature fast enough for the ECM.

LARRY70GS wrote:

Derek,
I agree, but don't old sensors become somewhat "Lazy" in response time. There is also the heater element that can throw a code when they don't get up to temperature fast enough for the ECM.

Your right and that's the correct word LAZY!!!

When they do become too "lazy" the PCM will report a code related to crosscounts too low. Until then it's still good enough.