Toyota Yaris Check Engine Light – Possible Catalytic Converter Failure?

If the check engine light has come on and the diagnostic scan pointed to a catalytic converter issue, it is likely that the converter is either clogged o r malfunctioning. A lack of power and strange smells from the exhaust are common symptoms of a failing catalytic converter, as it restricts exhaust flow and doesnt effectively process harmful emissions.

To diagnose the issue, you can check for other signs such as a rattling noise coming from under the vehicle o r a noticeable decrease in acceleration. A temperature test, where a mechanic measures the temperature before and after the converter, can confirm if it’s clogged. Additionally, if you haven’t done so already, ensure that there aren’t any other codes o r issues that could be contributing to the symptoms.

Replacing the catalytic converter is often the most effective solution, especially if it’s severely clogged o r damaged. However, there are a few steps you could take before replacing it. For minor blockages, using a catalytic converter cleaner may help, but this is typically not a permanent fix and may only work in cases where there is a slight clog. If the issue is related to the O2 sensors, replacing them might solve the problem.

If the catalytic converter is only slightly damaged, a repair might be possible, but in most cases, replacing the converter is the most reliable option. Regular maintenance, such as ensuring your engine is running smoothly and addressing any issues that cause excessive heat o r backpressure, can help extend the lifespan of the catalytic converter.