P0421 Engine Code

Check engine light on with code p0421, how do i fix it? P0031 code: ho2s heater control circuit low (bank 1 sensor 1) P0421 – warm up catalytic converter bank 1 efficiency below threshold

How to Diagnose and Fix P0421 Engine Code - OBD II Trouble Code Explain

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Check engine light on with code p0421, how do i fix it?

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Check engine light on with code p0421, how do i fix it?

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