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po420 and po430

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02-21-2011, 11:36 PM	#1
70stroker Registered User Join Date: Jan 2007 Location: pittsburg kansas Posts: 894	po420 and po430 96 yukon, 4x4, 5.7l. Its throwing a po420 and po430code. the po420 pops up about every 60 miles or so. the po430 just came up for the first time today. I know its cat efficiency low. What are some possible causes? Good starting test procedures? Any common problems associated with these codes and trucks? Thanks in advance __________________ 70 GMC build: http://67-72chevytrucks.com/vboard/s...d.php?t=613130

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