Will a Faulty Three-Way Catalytic Converter Affect Power and Fuel Consumption?
2 Answers
The three-way catalytic converter is an exhaust gas purification device in automobiles. Its primary function is to convert harmful substances in engine exhaust emissions, such as carbon monoxide, nitrogen oxides, and hydrocarbons, into harmless substances like water, carbon dioxide, and hydrogen. Therefore, if the three-way catalytic converter is damaged, the result will be excessive exhaust emissions and the illumination of the engine fault light, but it will not affect fuel consumption. Below is relevant information: Components that affect fuel consumption: Parts like the oxygen sensor and coolant temperature sensor have a significant impact on fuel consumption. If fuel consumption increases, it is more reliable to check these components. However, apart from failure, the three-way catalytic converter may also become clogged. If the three-way catalytic converter is clogged, the engine may experience insufficient power and increased fuel consumption, which requires attention. Removing the three-way catalytic converter: Removing the three-way catalytic converter can greatly affect the engine's low-end torque, and during daily driving, higher RPMs may be required to compensate for this deficiency, which will undoubtedly increase fuel consumption indirectly. If the three-way catalytic converter is removed, the reduction in exhaust backpressure (due to the lack of proper exhaust backpressure) will ultimately lead to a decrease in the vehicle's low-end torque.
As someone who frequently deals with cars, I've experienced catalytic converter failures several times and found that it indeed affects power and fuel consumption. When the exhaust system is clogged, the engine struggles to expel exhaust gases, leading to increased backpressure. The engine has to work harder to propel the car, resulting in noticeably slower acceleration, especially when climbing hills or overtaking. Fuel consumption also increases—I once measured that a faulty catalytic converter can raise fuel consumption by around 10% per 100 kilometers, equivalent to burning an extra 1-2 liters of fuel every 100 kilometers. This happens because a clogged catalytic converter may cause the oxygen sensor to report incorrect data, leading the engine control unit to miscalibrate fuel injection and reduce combustion efficiency. Early inspection and repair can prevent these issues, so don’t neglect exhaust system maintenance. After repairs, the car runs smoothly again, becoming fuel-efficient and high-performing.
