Will a Faulty Catalytic Converter Affect Power and Fuel Consumption?
3 Answers
No, if the catalytic converter is damaged, the result would be excessive exhaust emissions and the illumination of the engine fault light, but it would not significantly affect fuel consumption. Below is relevant information: Appearance: The catalytic converter looks like a metal can from the outside, but it contains a 'substrate' inside for purifying exhaust gases. This honeycomb-shaped ceramic substrate is coated with a precious metal slurry, primarily composed of platinum, rhodium, and palladium. Function of purifying exhaust gases: The precious metals act as catalysts, reducing hydrocarbons (HC) and carbon monoxide (CO) in the exhaust into water and CO2, while breaking down nitrogen oxides (NOx) into nitrogen and oxygen. This is the exhaust purification function of the catalytic converter.
I've been driving my car for ten years, and the worst thing I fear is a failed catalytic converter. If this part breaks, the exhaust gets blocked, the engine can't breathe properly, and the power drops noticeably. The throttle feels sluggish, and even climbing a hill becomes difficult. Fuel consumption also skyrockets. Once when mine failed, my usual highway fuel consumption of 8L/100km suddenly jumped to over 10L—wasting fuel and costing more. The reason is increased exhaust backpressure, forcing the engine to work harder but with reduced efficiency. Get it checked at a repair shop ASAP. After replacing the part, everything returns to normal. Don't delay, as it could damage the engine.
From my personal driving experience, a faulty catalytic converter definitely affects power and fuel consumption. Once during a business trip, my car suddenly lost power—stepping on the gas pedal all the way didn't help, and fuel consumption jumped from the usual 9 liters to 12 liters. This happened because the exhaust purification device was clogged, restricting exhaust flow. The engine couldn't breathe properly, naturally struggling to move the car and burning more fuel. I recommend paying attention to dashboard warning lights and increased exhaust odor—these are early signs. Replacing the part promptly can save a lot on fuel costs and prevent more serious engine issues.
