Modern car engine control systems rely on input from several sensors to regulate the engine’s performance as well as its emissions and other vital functions. When these sensors fail to provide ...

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 ...

We may receive a commission on purchases made from links. Modern cars are designed to be more efficient and eco-friendly than ever. Automakers build vehicles with a wealth of advanced features to not ...

A closed loop control system for regulation of engine air-fuel ratio at the stoichiometric value is required for effective operation of a three-way catalytic converter. System performance depends ...

Problems with catalytic converters are one of the most common causes of check engine lights, but they’re extremely exp ...

The oxygen sensors on your Toyota Celica help determine if the air-fuel ratio of the engine is rich or lean. This helps the electronic fuel injection adjust the mixture in real time and also reduce ...

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 ...