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Q: code po420 on 2000 Toyota Corolla

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how to check to make sure cat. converter is bad
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Typically you will have a Check Engine Code P0420 or it will rattle, especially in the morning. The code P0420 is common for the 1.8 lire Corollas. see the link below.
http://repairpal.com/OBD-Code-P0420