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What is code p0421 in a Hyundai Sonata 2003?

Anonymous

∙ 14y ago

Updated: 12/22/2022

If your looking just for what it means it says:

Warm up Catalyst

Efficiency Bank 1

Below Threshold

I am looking up how to fix it and so far I think it says to replace the O2 Sensor but I'm doing more research.

Wiki User

∙ 14y ago

What else can I help you with?

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