Engine Code P0420 Bank 1

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Code P0420 Catalyst Efficiency Below Threshold Bank 1. Emissions Test

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P0420 Code: Catalyst System Efficiency Below Threshold (Bank 1) - In

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P0134: O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 1) - In

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Code P0420 Bank 1: Which O2 Sensor Do I Replace? - Toyota FJ Cruiser Forum