P0420 Code Chevy Silverado Bank 1

Author Cortney Frami 10 Sep 2023

Code p0420 catalyst efficiency below threshold (bank 1), 59% off Bank 2 sensor 1 chevy silverado 2004 chevy silverado 5.3 l check engine light code p0420 an p4030 both

2004 Chevy Silverado 5.3 L check engine light code p0420 an p4030 both

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