When was the last time you thought about your vehicle's often overlooked parts, like the O2 sensor? The truth is that the O2 sensor serves a very important purpose and it can go bad, which means you ...

Average replacement cost of oxygen sensors . Replacing an oxygen (O2) sensor costs between $200 and $500 on average. The O2 ...

While relatively minor, check engine light repairs can be costly if neglected, leading to as much as 40 percent lower fuel efficiency. Metro News Service photo While relatively minor, check engine ...

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, ...

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 ...