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What is the engine check code P0421 on a 04 Mazda mpv?

Updated: 10/21/2022

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∙ 11y ago

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PO421 Warmup Catalyst Efficiency Below Threshold Bank 1Possible Causes:

Defective spark plug
Defective O2 Sensor
Defective Catalytic Converter

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Q: What is the engine check code P0421 on a 04 Mazda mpv?

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