How to Deal with the Illuminated Three-Way Catalytic Converter Warning Light?
2 Answers
When the three-way catalytic converter warning light in a car illuminates, the first step is to decode the car's computer system. If the light remains on after decoding, it indicates that the issue is not with the computer but likely a damaged oxygen sensor. In this case, it is necessary to visit a repair shop or a 4S dealership to have professionals repair or replace the oxygen sensor. Relevant information about the three-way catalytic converter is as follows: 1. The automotive three-way catalytic converter is an external purification device in the car's exhaust system. It is called 'three-way' because it can purify three types of exhaust gases. 2. The three-way catalytic converter contains a purifying agent. When high-temperature exhaust gases pass through it, certain oxidation-reduction chemical reactions occur with CO, HC, and NOx gases in the exhaust. This process oxidizes CO into carbon dioxide gas at high temperatures, oxidizes HC compounds into water and carbon dioxide, and reduces NOx into nitrogen and oxygen, thereby achieving purification.
I just got my driver's license not long ago and don't have much driving experience. One time, the catalytic converter warning light suddenly came on, and I panicked. I immediately pulled over to a safe spot and checked the manual, which said there was an issue with the emission system. I tried checking if the fuel cap was tightened properly, but the light still didn't go off. At that point, I didn't dare to keep driving because I read online that continuing to drive could damage the engine or emit pollutants. I quickly called a mechanic, who suggested scanning the trouble codes with a diagnostic tool. It turned out the oxygen sensor was faulty. In the end, replacing the part solved the problem. The lesson I learned is: when a warning light comes on, the first thing to do is pull over and check simple things, but it's best to seek professional help for repairs—otherwise, a small issue could turn into a big headache. Also, always use high-quality fuel and avoid low-grade gasoline to prevent warning lights from coming on.
