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12-27-2013, 12:21 AM
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#3 |
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blood type; Retumbo
Join Date: Jan 2004
Location: next to my reloading bench
Posts: 10,269
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Re: 99 C1500 Suburban P0420 code
P0420; low catalyst efficiency bank 1
bank one is the driver's side. Every single time I've seen a 420/430 it has been a bat cat. Aftermarkets only last 2 years at best unless you spend the big bucks for one with plenty of precious metals in it (dealer) find cause for cat going bad before throwing $600/cat at the truck. also watch the bank 2 sensors to see how far that one is from dying.
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Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card |
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