where do I find bank 1? code P0420

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Carguy1 · Answer 1 · 2018-12-24T17:18:52+0000

Hi there

Bank 1 is the rear bank of the engine.

Here is a list of possible causes for the code.

P0420 BUICK - Catalyst System Low Efficiency Bank 1

Read more: https://www.autocodes.com/p0420_buick.html