How Often Should the Three-Way Catalytic Converter Be Replaced?
2 Answers
The three-way catalytic converter should be replaced every 30,000 kilometers. The three-way catalytic converter is an important external purification device installed in the vehicle's exhaust system. It converts harmful gases such as CO and HC in vehicle exhaust into harmless carbon dioxide, water, and nitrogen through oxidation and reduction reactions. Symptoms of a faulty three-way catalytic converter include: 1. The engine malfunction indicator light will illuminate when the engine's electronic control unit (ECU) fails to detect or detects abnormal signals from the oxygen sensor; 2. Increased fuel consumption and reduced power; 3. Blockage of the three-way catalytic converter, which can easily lead to excessive engine temperature; 4. Severe imbalance in the air-fuel ratio of the combustible mixture in the cylinders, causing incomplete combustion and resulting in a large accumulation of carbon deposits in the cylinders, thereby increasing carbon buildup.
Oh, the catalytic converter, that thing in the car's exhaust pipe that processes emissions. Usually, it doesn't need regular replacement and can last quite a long time, roughly around 80,000 to 100,000 kilometers or even more. I've been driving my car for years and never specifically replaced it. The key is to consider driving habits and environment. For example, frequent driving in congested urban areas with heavy emissions and carbon buildup might accelerate wear; or when using low-quality fuel, the catalyst coating can degrade faster. If you notice a sudden increase in fuel consumption, strange smells from the exhaust, or the dashboard warning light comes on, it might be a sign of a problem and should be checked. During regular maintenance, just have the technician inspect the exhaust pipe condition. Under normal driving conditions, it's common to go ten years without replacement, but once it fails, not only will it affect emissions testing, but it could also harm the engine. So, I suggest leaving it alone unless necessary and focusing on maintenance. This way, it's both hassle-free and cost-effective.
