Check Engine light P0430 - Replaced Cat in January failed again replaced again lasted 10 days

[Dutchman424]

I have replaced all spark plugs and coil packs, Maf sensor, and all O2 sensors in bank 1 and 2 and not able to reset code.
Smoke tested no vacuum leaks, fuel pressure at 60 psi, no visible antifreeze leak, no oil burning and it only has 56000 Km.
Does anyone have any ideas where to look next? Injectors?

 

[melsg5]

This link, among other things, recommends checking the voltage reading on the downstream sensor for bank 2.

OBD-II Trouble Code: P0430 Catalyst Efficiency Below Threshold (Bank 2)

 

[Dutchman424]

Downstream bank 2 sensor is switching as are all the other O2 devices.

 

[Dutchman424]

The catlytic convert or is a Walker 54900 not a gm cat.

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[melsg5]

What year is the vehicle and do you know what state it was originally sold in?
The Walker site lists multiple converters depending on state, year, and engine.

 

[Dutchman424]

2008 Pontiac Torrent GXP AWD bought in Edmonton Alberta Canada.
There seems to be no lack in power/performance. Is it possible that I may have to go to an OEM convertor? Could Walker be restricting flow?

 

[melsg5]

Did you use AC-Delco O2 sensors?

 

[Dutchman424]

NGK O2 sensors
Had it looked at again today.
The walker cat was showing 98c and the OEM cat was showing 200c. The walker cat is poorly designed so I’m ordering in a OEM it will be in about 7 days. The engine is running to factory specs no oil leaks and antifreeze leaks. Fuel trim is good and no lack of power. I will update after new Cat is installed.

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