05 CTT code P0431?

[Bansasn]

Hi Fellas and Gals,

 

I'm sure this issue came up in the past.  I have not be able to find it.  My 05 CTT CEL came up and the code is P0431 bank 2.  I did some research and found out that the code is related to these symptoms.  

 

The catalytic converter is no longer functioning properly

An oxygen sensor is not reading (functioning) properly

There is an exhaust leak

Have any of you had this code?  What parts triggered this? I'm thinking its the O2 sensor.   Is there a CTT DIY page how remove the O2?  Thank you.

[JFP in PA]

P0430 is pretty specific.  Before assuming it is the O2 sensor, I would check the voltage curves on the sensors for that bank with the engine running.  If the voltage curves are following each other, the cat is gone.  As the cats are rather expensive, I would also clear the code(s) and see if they return before jumping into changing any parts.

[Bansasn]

Thanks.  I will do that before ordering the parts.