Add Yahoo as a preferred source to see more of our stories on Google. Q: In my vehicle, the check engine light comes on and then goes off and it is now back on. I had a test done at local auto-parts ...

While O2 sensors have no fixed replacement schedule, your driving style and the health of other engine components can drastically affect its life span.

The "Check Engine" light is the most feared dashboard notification, but for the Oxygen (O2) sensor, it is a lagging indicator. By the time that light illuminates to tell you your O2 sensor has failed, ...

The check engine light has always been a bit of a gamble. Sometimes it’s a loose gas cap. Other times, it’s a four-figure reminder that modern cars are way more complex than they need to be. What’s ...

I had a test done at local auto-parts store that showed a code of PO138. They told me this indicates a problem with the oxygen sensor. I replaced the oxygen sensor and the light never went out. I ...