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2014 Chevy Silverado
Platform: Truck, GMT 400, 800, & 900

PCM code P0 420

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Old Sep 19, 2012 | 8:40 PM
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dstill9's Avatar
dstill9
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Default PCM code P0 420
Is this the post oxygen sensor?
dstill9
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Old Sep 19, 2012 | 9:47 PM
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MDTAHOE
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From: Bowie, MD
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PO420 is catalyst efficiency low bank 1. You need a cat converter.
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