Can a malfunctioning catalytic converter trigger the check engine light in the Honda City?

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Can a malfunctioning catalytic converter trigger the check engine light in the Honda City?

What error codes such as P0420 are related to catalytic converter failure, and how can they be diagnosed?

Sirat Ul Jinan asked on 27 Feb 2025 12:18:44 pm

1 Answer

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Car Mechanic Expert - on 27 Feb 2025 12:36:50 pm

Yes, a faulty catalytic converter can trigger the Check Engine Light CEL.

Error codes: Common error codes related to catalytic converter failure include P0420 Catalytic Converter Efficiency Below Threshold and P0430. These codes indicate that the converter is not functioning properly o r that the exhaust gases are not being properly filtered.
Diagnosis: A mechanic can use an OBD-II scanner to read the error codes and confirm whether the catalytic converter is the issue. Additional tests like a live data scan of the oxygen sensors may also be conducted to verify converter efficiency.