How often should you replace your engine's oxygen sensors?

While O2 sensors have no fixed replacement schedule, your driving style and the health of other engine components can ...
The Providence Journal

The oxygen sensor was replaced, 'check engine' light is still on. The Car Doctor responds

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 ...

5 things to do when the car’s check engine light comes on before spending money at the mechanic

When the check engine light comes on, you may hesitate taking it to a mechanic who will charge you for a non-problem. Learn ...
Morning Overview on MSN

6 reasons your check-engine light keeps coming back on

Drivers who clear a check-engine light only to see it return days or weeks later are not dealing with a glitch. Federal ...
AutoGuide

Average Cost To Fix A Check Engine Light Is More Expensive Than Ever

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 ...