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
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