Thread: po420 and po430
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Old 05-16-2011, 11:31 PM   #8
68C15
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Join Date: Jan 2004
Location: next to my reloading bench
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Re: po420 and po430

just be ready for insufficient EGR flow codes in the future.

the #1 reason I see P0420 and P0430 is coolant leaking past the intake gaskets. coolant contains silicates. silicates create a coating on the converter substrate blocking it from performing the necessary chemical reactions. it doesn't take a large leak. a very small leak, even vapors, over an extended time will do this.
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