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What does code p0421 mean on a Hyundai santafe?

Anonymous

∙ 17y ago

Updated: 10/21/2022

I believe 0421 is a catalytic converter inefficiency code which is usually caused by a bad o2 sensor or a bad catalytic converter, but I have also seen fouled plugs and exhaust leaks cause this code.

Wiki User

∙ 17y ago

What else can I help you with?

What does engine code P0421 mean?

P0421 code = Warm up catalyst efficiency below threshold, Bank 1

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When this code come out may be haven no enough warm up on the catalyst is efficienecy the vehicle has an exhaust leak

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Trouble code P0172 means: System too rich (Bank 1)

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