Will the engine malfunction light come on if the oxygen sensor is faulty?

[OAvery]

If the oxygen sensor is faulty, the engine malfunction light will come on. Poor performance of the oxygen sensor can affect the normal operation of the engine. Relevant information about the oxygen sensor is as follows: 1. Introduction: The oxygen sensor is used to detect the concentration of oxygen in the exhaust and sends feedback signals to the ECU, which then controls the increase or decrease of the fuel injector's fuel supply, thereby keeping the air-fuel ratio of the mixture near the theoretical value. 2. Function: The sensor measures whether there is excess oxygen in the exhaust after engine combustion, i.e., the oxygen content, and converts the oxygen content into a voltage signal transmitted to the engine computer, enabling the engine to achieve closed-loop control targeting the excess air factor. This ensures that the three-way catalytic converter achieves maximum conversion efficiency for the three pollutants in the exhaust—hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NOX)—maximizing the conversion and purification of emission pollutants.