What are the symptoms of a faulty engine oxygen sensor?

[DanteDella]

When the oxygen sensor in a car engine fails, symptoms may include the illumination of the malfunction indicator light, engine shaking, popping sounds from the exhaust, a pungent odor, increased fuel consumption, and lack of power when climbing hills. Below is an introduction to the oxygen sensor: The core component of the oxygen sensor is a porous zirconium dioxide ceramic tube, which is a solid electrolyte. Porous platinum (Pt) electrodes are sintered on both sides. At certain temperatures, due to the difference in oxygen concentration on both sides, oxygen molecules on the high-concentration side are adsorbed onto the platinum electrode and combine with electrons to form oxygen ions, making this electrode positively charged. The oxygen ions migrate through oxygen ion vacancies in the electrolyte to the low oxygen concentration side (exhaust gas side), making that electrode negatively charged, thus creating a potential difference.