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What does the code PCM P0420 for a 1998 Cadillac Deville?

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What does the code PCM P0420 for a 1998 Cadillac Deville?

Vehicle: 1998 Cadillac Deville

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This code is for the bank 1 catalytic converter below threshold. This normally requires the bank 1 converter to be replaced. It can also be an issue with an air leak, or the rear O2 sensor.
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P0420 CADILLAC - Catalyst System Low Efficiency Bank 1

Read more: https://www.autocodes.com/p0420_cadillac.html

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