What are the most common signs of a failing catalytic converter in a Toyota Prius?

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What are the most common signs of a failing catalytic converter in a Toyota Prius?

A bad catalytic converter can cause reduced engine performance, bad fuel economy, check engine lights, o r a sulfur rotten egg smell. What are the key symptoms that Prius owners should watch out for?

Qalb E Momin asked on 14 Feb 2025 16:16:05 pm

1 Answer

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Car Mechanic Expert - on 14 Feb 2025 16:18:33 pm

A failing catalytic converter can exhibit several symptoms. These include:

Reduced engine performance: A clogged o r inefficient catalytic converter can cause power loss, especially during acceleration.
Poor fuel economy: The engine may have to work harder to maintain performance, resulting in increased fuel consumption.
Check engine light: The vehicle’s OBD-II system often triggers a check engine light CEL due to faulty catalytic converter readings.
Sulfur rotten egg smell: A bad catalytic converter may cause an unpleasant sulfuric odor, which is due to the incomplete combustion of fuel in the engine.

If you notice any of these signs, it’s essential to get the catalytic converter inspected o r diagnosed as soon as possible.