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What does Catalysis Bank 1 P0421 mean on a 2002 Audi A6 Quatro?

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What does Catalysis Bank 1 P0421 mean on a 2002 Audi A6 Quatro?

Vehicle: 2002 Audi A6 Quatro

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Hi there,

This means the catalytic converter on bank 1 is not cleaning the exhaust enough to satisfy the computer. This can be caused by a faulty converter or a bad rear O2 sensor.
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P0421 AUDI - Warm Up Catalyst Efficiency Below Threshold Bank 1

Read more: https://www.autocodes.com/p0421_audi.html

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