How to Determine if the Three-Way Catalytic Converter is Clogged?
2 Answers
Methods to determine if the three-way catalytic converter is clogged: 1. Check if the voltage of the front and rear oxygen sensors of the three-way catalytic converter is the same; if they are the same, it indicates a blockage. 2. Place your hand near the exhaust pipe to see if you can feel airflow; if not, it suggests a blockage. 3. Remove the air filter and quickly press the accelerator while stationary, observing if black smoke comes out from the air filter. 4. Feel the temperature difference between the front and rear of the three-way catalytic converter to determine if it is clogged. 5. During a test drive, if the vehicle cannot reach higher speeds and acceleration is poor, it may indicate a blockage. The three-way catalytic converter is an important external purification device installed in the vehicle's exhaust system, converting harmful gases such as carbon monoxide, hydrocarbons, and nitrogen oxides emitted by the vehicle into harmless carbon dioxide, water, and nitrogen through oxidation and reduction reactions.
I've been driving for twenty years and have encountered several instances of a clogged catalytic converter. My experience tells me to watch for engine abnormalities. When pressing the accelerator, the car feels sluggish, lacking power when you step on the gas, and struggles during uphill climbs or acceleration, almost like it's gasping for breath. At idle, like when waiting at a red light, the engine shakes noticeably, as if it's struggling. Additionally, fuel consumption inexplicably increases—you end up spending more on gas for the same distance. Listen to the exhaust pipe; if there's a hissing sound or the exhaust seems obstructed, it's likely a clog. I suggest owners do a simple test: touch the exhaust pipe before driving. If it's excessively hot to the touch, there's an 80% chance it's a catalytic converter issue. In severe cases, you might even notice a strange odor, like a sulfur-like stench. Don't hesitate—head to the repair shop immediately. A clogged catalytic converter not only affects performance but can also damage engine components. My old car almost had a major issue because of this.
