will a bad catalytic converter throw a code?

How to identify a bad clogged catalytic converter.

Check engine light turns on Usually, an illuminated check engine light is the first and only sign of a bad catalytic converter. When the light pops on, your car’s engine control module (ECM) will also store a diagnostic trouble code (often a P0420 code) in its memory.

SYMPTOMS OF A BAD CATALYTIC CONVERTER

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