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What happens when a motorcycle oxygen sensor fails?

2 Answers
KendraRose
07/24/25 6:07am
When the oxygen sensor of a motorcycle fails, due to the working environment often being in a state of excessive carbon content, aging and poisoning phenomena will occur. Aging refers to the reduction in working efficiency caused by high temperatures that the sensor cannot withstand, while poisoning occurs when the oxygen sensor fails due to excessive accumulation of carbon monoxide, resulting in a poisoning failure. In addition, if the internal resistance wire burns out or the sensing wire falls off, it can also cause the front oxygen sensor to fail. If the vehicle experiences reduced power, difficulty in acceleration, unstable idle speed during operation, increased fuel consumption, and excessive emission of pollutants, these may all be signs of a faulty front oxygen sensor. Of course, it is also necessary to first check the car's engine and whether it is a spark plug failure or a fuel supply device failure. Additional Information: 1. Low-end motorcycles do not have oxygen sensors; only some motorcycles equipped with electronic fuel injection engines will have oxygen sensors. The oxygen sensor is installed in front of and behind the three-way catalytic converter. The oxygen sensor in front is called the front oxygen sensor, and the one behind is called the rear oxygen sensor. The main function of the front oxygen sensor is to detect the oxygen content in the exhaust, and then the ECU can adjust the air-fuel ratio based on the data transmitted by the front oxygen sensor. The main function of the rear oxygen sensor is to check whether the three-way catalytic converter has failed. 2. If the data transmitted by the front and rear oxygen sensors to the ECU are similar, it indicates that the three-way catalytic converter has failed. If the three-way catalytic converter fails, the fault light on the dashboard will illuminate to alert the driver. It is normal for the three-way catalytic converter to fail after prolonged use. If low-quality gasoline is frequently used, it can reduce the service life of the three-way catalytic converter. Therefore, it is recommended that owners choose gas stations with relatively better fuel quality when refueling.
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DeAbigail
08/11/25 1:51am
I've been riding motorcycles for years, and if the oxygen sensor fails, it's not good. It monitors the oxygen in the exhaust, and when it malfunctions, the engine runs with an incorrect air-fuel ratio, causing fuel consumption to skyrocket. A tank of gas that used to last 500 kilometers now triggers a warning at 450. Power also drops noticeably, with sluggish acceleration and severe shaking, making overtaking a nerve-wracking experience. Emissions exceed standards significantly, with foul-smelling exhaust polluting the air. If left unrepaired for long, the catalytic converter will also fail, leading to repair bills in the thousands. So don't delay—get it checked as soon as the warning light comes on. Don't penny-pinch and risk bigger problems.
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