Has Anyone Experienced a Check Engine Light Due to a Faulty Catalytic Converter?

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Has Anyone Experienced a Check Engine Light Due to a Faulty Catalytic Converter?

A failing catalytic converter can trigger the check engine light. Have you ever had this issue, and what diagnostic trouble codes DTCs did you find?

Lubaba asked on 11 Feb 2025 16:27:01 pm

1 Answer

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Car Mechanic Expert - on 11 Feb 2025 16:30:46 pm

Yes! A bad catalytic converter often triggers the Check Engine Light CEL.

🔍 Common Diagnostic Trouble Codes DTCs:
✔️ P0420 - Catalyst System Efficiency Below Threshold Bank 1
✔️ P0430 - Catalyst System Efficiency Below Threshold Bank 2

📌 Solution: Use an OBD-II scanner to check for these error codes. If found:
✅ Try a catalytic converter cleaner to clear minor deposits.
✅ Inspect oxygen sensors faulty O2 sensors can trigger similar codes.
✅ Replace the catalytic converter if fully clogged o r damaged.