Diagnostic Trouble Code P0420

Elinore Stracke 29 Jun 2024

P0420 code is a diagnostic trouble code that appears on vehicles Part 1 -how to test trouble code p0420 (gm 3.8l) Code p0420?: i am getting p0420 on my vehicle listed above base

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Code p0420?: i got the error code p0420, catalyst system

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