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What does a P0420 code mean on 2001 Toyota sienna?

P0420 code means that the catalytic converter is not functioning as efficiently as it should. This could be due to a number of factors, including:

- A faulty oxygen sensor

- A bad catalytic converter

- An exhaust leak

- A problem with the fuel injection system

To determine the exact cause of the code, you will need to have the car inspected by a qualified mechanic.

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