Question about 2001 Toyota Corolla
A code P0420 may mean that one or more of the following has happened:
About the possible solutions, some suggested steps for troubleshooting include:
Overall probably the biggest mistake vehicles owners make when they
have a P0420 code is to simply replace an oxygen sensor (H02S). It is
important to do proper diagnosis so you're not wasting money replacing
We strongly recommend that if you need to replace the catalytic converter that you replace it with an OEM unit. Second choice would be a high-quality replacement part. There are many stories in our forums where folks replaced the cat with a cheaper aftermarket one only to have the code return shortly thereafter.
Hope this helps.
Posted on Dec 08, 2012
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Posted on Jan 02, 2017
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