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Discussion Starter #1
My check engine light came on I read the code is said p0430 ( Catalyst system Efficiency below Threshold Bank 2) the truck has two catalytic converters is there a way to pin point just what the problem is. I am not convinced that the cat on bank 2 is bad.
 

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A little late but I took your code P0430 with that phrase included and it seems to point to a cat not working accordingly, but, since you believe its not you need to monitor other things involved and test as well.
 
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Junior Member
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Discussion Starter #3
As it turned out I did replace both cats and it still wouldn't pass emission test but did run so much better. I replaced the gas cap and all is good in Chevy world
 

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Good deal, just keep up maintenance and it will always run fine. Did they say what reading(s) was too high if you remember?
 
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