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Yep, I think they might be the go if I can't sort this out.. thanks for the tip!

Cheers for the response. Nope, I don't have a scan tool unfortunately.. After replacing the sensors I took it to Holden and I thought they would check that stuff for me, but they just told me it needed a new cat and that there was no software upgrade for that model. Of course once I had the cat...

Thought I'd revive this thread rather than starting a new one. I'm getting a consistent P0430 code (bank 2 catalytic efficiency) on my VE Omega Ute. I've disconnected the battery, replaced all the oxygen sensors, the catalytic converter (new gaskets, etc.), plugs, checked for exhaust leaks...