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Hi all...PlainJane here again.
My 2012 Lambda EVAP System is reading negative numbers and causing my check engine light to come on, but code PO420 which is cat converter code and that has been replaced with CA and NY emissions requirements. The purge valve has also been replaced. We're thinking possibly something is wrong with the EVAP Canister? Any suggestions? Can it be tested? No code PO449 though. Any help is much appreciated...thanks all.
 

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Look for black stains or particles in the purge valve inlet connection. If so then carbon is coming out of the canister and causing purge valve not to seal properly.
 
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