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 store that showed a code of PO138. They told me this indicates a ...

Wideband O2 sensors play a pivotal role in the realm of automotive tuning, providing precise measurements of the air-fuel ...

What could be the reason for your car to fail a pollution test? While there may be many factors, one of the most common problems is that the vehicle hast run long enough to warm up the catalytic ...

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 ...

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 ...