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 ...

Ignoring a check engine light might feel harmless if the car still runs smoothly, but the warning signals more than a minor inconvenience. Driving with that light on can lead to higher repair costs, ...

Modern vehicles are pretty complicated pieces of tech. Apart from emissions and other vital functions, the engine control system relies heavily on several sensors to regulate performance. That is ...