Cadillac deville dts 2002 p0420

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Carguy1 · Answer 1 · 2018-07-12T19:04:53+0000

Hi there,

This code indicates an issue with the catalyst system. Here is a list of possible causes.

P0420 CADILLAC - Catalyst System Low Efficiency Bank 1

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