Will the malfunction indicator light come on if the three-way catalytic converter is faulty?
2 Answers
The malfunction indicator light will come on if the three-way catalytic converter is faulty. The primary function of the three-way catalytic converter is to filter vehicle exhaust, ensuring the final emissions meet standards. Below is relevant information: Introduction: The three-way catalytic converter is the most important external purification device installed in a vehicle's exhaust system. It converts harmful gases such as CO, HC, and NOx emitted from vehicle exhaust into harmless carbon dioxide, water, and nitrogen through oxidation and reduction reactions. When high-temperature exhaust passes through the purification device, the catalyst in the three-way catalytic converter enhances the activity of CO, HC, and NOx, promoting specific oxidation-reduction chemical reactions. CO oxidizes at high temperatures into colorless, non-toxic carbon dioxide gas; HC compounds oxidize into water (H2O) and carbon dioxide; and NOx reduces into nitrogen and oxygen. These three harmful gases are transformed into harmless gases, thereby purifying the vehicle's exhaust. Consequences of a faulty three-way catalytic converter: Besides triggering the engine malfunction indicator light, a faulty three-way catalytic converter can easily lead to excessive exhaust emissions. This is because, when the three-way catalytic converter is clogged, chemical complexes adsorb onto the catalyst's surface.
My car had a failed catalytic converter before, and the check engine light came on immediately. At that time, I was on the highway and felt a lack of power when accelerating, which made me suspect something was wrong. As soon as I got home, the yellow light on the dashboard stayed on. After taking it to the repair shop, the mechanic told me the catalytic converter was clogged, causing excessive emissions, and the onboard system detected it, triggering the warning light. If not repaired promptly, not only would it fail the annual inspection, but the strong exhaust smell could also lead to fines. That time, I spent over 3,000 yuan to replace the part. Now, whenever the light comes on, my first suspicion is either the catalytic converter or the oxygen sensor. It’s important to pay attention to warning lights during daily driving—protecting key components can help avoid major repair costs, ensuring both safety and savings.
