Can a check engine light indicate catalytic converter issues in a Prius?

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Can a check engine light indicate catalytic converter issues in a Prius?

A faulty catalytic converter often triggers OBD-II error codes like P0420 Catalyst System Efficiency Below Threshold. How can Prius owners use an OBD-II scanner to confirm catalytic converter problems?

Qalb E Momin asked on 14 Feb 2025 16:16:21 pm

1 Answer

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Car Mechanic Expert - on 14 Feb 2025 16:21:25 pm

Yes, a faulty catalytic converter often triggers the check engine light. Common diagnostic trouble codes DTCs related to catalytic converter problems include:

P0420: Catalyst System Efficiency Below Threshold common with clogged converters.
P0430: Catalyst System Efficiency Below Threshold Bank 2.

Using an OBD-II scanner can help confirm if the issue is related to the catalytic converter. If the code persists, it may require replacing the converter.