How Often Should the Three-Way Catalytic Converter Be Replaced?
3 Answers
The three-way catalytic converter does not have a fixed replacement interval and only needs to be replaced when it fails. Under normal usage, the three-way catalytic converter does not require replacement—only regular cleaning is necessary. However, if the converter's housing is damaged or particulate matter is emitted from the exhaust tailpipe, replacement is required. Below is additional information about the three-way catalytic converter: 1. If your car experiences issues such as increased fuel consumption, sluggish acceleration, difficulty in raising RPM, or even starting problems during use, the condition of the three-way catalytic converter should be inspected. Cleaning and unclogging the converter can restore normal fuel efficiency and performance. 2. If you hear a hissing or gurgling noise when accelerating or detect a pungent, foul odor during idling or acceleration, the catalytic converter may be malfunctioning, and immediate inspection at a 4S shop is recommended. 3. The three-way catalytic converter is an external purification device that converts harmful exhaust gases such as CO, HC, and NOx into harmless carbon dioxide, water, and nitrogen through oxidation and reduction reactions.
I'm the most qualified to speak on this. The three-way catalytic converter is actually quite long-lasting. As long as it hasn't been damaged in a collision or exposed to substandard gasoline, you typically don't need to worry about replacing it until around 100,000 kilometers. I've had an old car for eight years, and its catalytic converter is still in perfect condition. However, pay attention to warning signs like foul-smelling exhaust or sluggish acceleration—failed emissions tests often mean the converter is signaling trouble. For routine maintenance, remember to regularly check the oxygen sensor, as it significantly impacts the converter's lifespan. Most importantly, never put diesel or leaded gasoline in a gasoline-powered car—just one mistake could ruin the entire catalytic system, and replacements start at 5,000 RMB, which is genuinely painful.
After so many years in auto repair, I've rarely encountered a catalytic converter that failed naturally. It can withstand temperatures up to 1000 degrees Celsius, and the ceramic substrate isn't that fragile. The most common issue is the emission warning light coming on - don't rush to replace the converter when this happens. First check the upstream and downstream oxygen sensors. I've had customers waste money on new converters only to discover it was just a loose oxygen sensor connector. There are only two situations that truly require replacement: when the converter substrate crumbles and blocks the exhaust pipe, or when it still fails emissions testing after cleaning. Older vehicles, especially those meeting China III emission standards, do require more attention now due to stricter annual inspection requirements.
