My other car CEL

[ChicagoG8GT]

I have a 2006 G6 3.5 thats throwing code P0422? Any ideas what could be going on? TIA

[GRRRR8]

I have a 2006 G6 3.5 thats throwing code P0422? Any ideas what could be going on? TIA

This is a cat efficiency issue code. This code usually means the cat is damaged. How does it run? From my experience low power and poor fuel economy are the symptoms.

[ChicagoG8GT]

Well I dont drive it too often but her car has always got bad gas mileage. Although she (wife) drives like a idiot (always late to work) and all city driving. Could this be o2 sensor related? The last time I drove it to check the code it seemed ok as far as acceleration and idle???

[GRRRR8]

It could be, but I dont think so. If the cat is bad it has a 8 year/80,000 mile federal warranty, so no matter what shape GM is in its free. :)