If catalytic converters is bad will it smell?

Yes, a malfunctioning catalytic converter can produce a noticeable smell. When it fails, it may lead to the release of unburned fuel or sulfur compounds, which can create strong odors, such as a rotten egg smell. Additionally, exhaust gases may not be properly filtered, resulting in unpleasant emissions. If you notice a strange smell coming from your vehicle, it's important to have it checked by a professional.