P0421 Engine Code

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Got engine code p0421 (catalyst efficiency below threshold bank 1

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Check engine light p0421 code

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Check Engine Light on with Code P0421, How Do I Fix It?

Check Engine Light on with Code P0421, How Do I Fix It?

P0031 Code: HO2S Heater Control Circuit Low (Bank 1 Sensor 1) - In The

P0421 Code: Warm Up Catalyst Efficiency Below Threshold (Bank 1) - In

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