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What is check engine error code P0420 on a 2001 Sienna?

The trouble code P0420 on a 2001 Sienna indicates that the catalytic converter is not functioning properly. The catalytic converter is a part of the vehicle's emission control system and helps to convert harmful pollutants in the exhaust into less harmful substances. When the catalytic converter fails, it can cause the vehicle to emit excessive pollutants and fail emission tests.
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