Have You Faced Issues Passing an Emissions Test Due to a Bad Catalytic Converter?

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Have You Faced Issues Passing an Emissions Test Due to a Bad Catalytic Converter?

A failing catalytic converter can lead to increased emissions and a failed smog test. Have you had trouble passing emissions inspections, and how did you fix the issue?

Lubaba asked on 11 Feb 2025 16:29:30 pm

1 Answer

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Car Mechanic Expert - on 11 Feb 2025 16:32:14 pm

🚨 A failing CAT can cause higher emissions, leading to a failed smog test.

🔍 Signs You Might Fail an Emissions Test:
❌ High Carbon Monoxide CO o r Hydrocarbons HC – Incomplete combustion.
❌ Check Engine Light P0420/P0430 – The catalytic converter isnt working properly.
❌ Dark o r Blue Smoke from Exhaust – Indicates an oil o r fuel problem.

📌 Solution:
✅ Use a catalytic converter cleaner before the test.
✅ Replace a severely damaged converter to meet emission standards.
✅ Ensure oxygen sensors are functioning properly for accurate readings.