We tested popular wideband O₂ controllers against lab-grade equipment to see how accurate their lambda readings really are under real engine conditions.

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 ...

Modern cars rely on a dense web of sensors to manage everything from fuel delivery to collision avoidance, and when one fails, the result can range from a minor annoyance to a four-figure repair. I ...

The problem: The check-engine light may illuminate due to a faulty oxygen sensor. Cars affected by service bulletin: Equipped with turbocharger 1.6-liter engine See More Service Bulletins Corrective ...

How do you check if the oxygen sensor is working? I have a VX Commodore that is misfiring when idling. It was fine before it was stored in the shed for a few months, we have done coil packs, air ...