Please ID these wires by transmission

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Where's your o2 sensor plug at?

You're running around with a P0420 code I bet.

 

I thought it was after the cat. Maybe not. I'll have to double check. Also, I had the code before the cat theft as well.

 

Shit, didn't read the 'stolen' part.

Insurance didn't cover anything?

 

Not insured for theft.

 

Yep looks like the truck side wires for your down stream sensor. Old pic I took of some sensors I changed a while back

There's 4 sensors total. 2 up stream before the cats on each bank and 2 down stream between the cats on each bank.

[Edit: just realized this was on a first gen. Not sure of the sensor layout on the first gen trucks, but it is still indeed the wires that lead to plug on the truck side for your sensor]