[Widgmaster]

Every thing I read tells me you have a bad cat. But there is a fix for that beside having to replace the cat... Just type into your Google browser and lots of stuff comes up
Type this How to fix a P0421 code ... Hope this helps you...

 

[Widgmaster]

That's right @GTSDriver2003 .... so I kicked mine in the butt, and it coughed up a fur ball …

 

[Widgmaster]

I think @JeepToke is with Elvis, and he left the building ...