Why Replace A Faulty Oxygen Sensor? A faulty sensor cannot transmit accurate data to the car's computer, causing the engine to run unbalanced. An unbalanced engine either burns fuel with too much or ...

Fuel trims and oxygen sensors work together to keep the air-fuel ratio in balance for performance, efficiency, and emissions control. Knowing how short- and long-term trims function, along with proper ...

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 ...