How to Determine if the Three-Way Catalytic Converter is Clogged?
2 Answers
The three-way catalytic converter is essentially an exhaust purifier. If the exhaust emissions exceed the standard, it naturally indicates a problem with the three-way catalytic converter, meaning it is clogged. When the three-way catalytic converter is clogged, turbocharged models are the most affected, showing symptoms such as reduced power, sluggish acceleration, and increased fuel consumption. If the three-way catalytic converter is severely clogged, the inability to expel exhaust gases in time will inevitably cause backpressure and reverse flow.
After driving for so many years, the most direct feeling is the change in the car's power. If the catalytic converter is clogged, you'll clearly feel the engine lacking strength during acceleration, and it's even more strenuous when going uphill, as if something is holding it back. Fuel consumption also noticeably increases—where a full tank used to cover 500 kilometers, now it might barely make 450. After parking, squat down and check the exhaust pipe outlet; if there's a layer of black soot or abnormal smoke, that's a sign of blockage. You can also detect it by sound—unusual buzzing noises when starting the engine or increased operational noise. All these stem from the catalytic converter's blockage affecting exhaust flow, leading to accumulated exhaust gases over time. When I encounter this, I first visit a nearby repair shop to have the mechanic scan for trouble codes with an OBD device. Ignoring it risks engine overheating. Drivers who develop the habit of checking these small details can save themselves a lot of trouble.
