Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Catalytic Converter: Testing and Inspection


1. Remove the catalytic converter from the vehicle.
2. Inspect the visible internal portions of the catalytic converter for signs of melting or damage due to afterfiring.
3. Gently shake the catalytic converter and listen for signs of loose components.
4. If any of the above conditions are found replace the converter.