What does Bank 1 Sensor 1 mean?

1 Answers
BryceDella
07/30/25 4:43am
Bank 1 Sensor 1 refers to a fault in the front oxygen sensor. It is recommended to check the data stream through professional equipment and then analyze and troubleshoot. In engines equipped with three-way catalytic converters to reduce exhaust pollution, once the air-fuel ratio of the mixture deviates from the theoretical air-fuel ratio, the purification capability of the three-way catalyst for CO, HC, and NOx will sharply decline. Therefore, an oxygen sensor is installed in the exhaust pipe to detect the oxygen concentration in the exhaust and send feedback signals to the ECU. The function of the sensor is to determine whether there is excess oxygen in the exhaust after engine combustion, i.e., the oxygen content, and convert 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.
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