Ok. So just to make sure u saw this when you're doing your wiring.
Your existing wiring for the 02 sensors makes your existing sensors basically the left bank sensors.
Originally on the 03s you'll have a 1/1 and a 1/2 sensor because there are usually only 2 sensors on the truck.
Now for the 05 wiring:
I actually went in and bypassed the original harness and ran new wires up to the PCM so I didn't get confused as to what I was wiring up. The grounds are easy, you can literally take all of the pin 2s together, bundle them all up and run them all directly to ground.
So your 1/2 and 2/2 sensors should have 1 wire at pin3 at both sensors spliced together into a single wire and should go to pin 32 at connector c2 at the PCM.
Pin 2 at both sensors can be ran directly to chassis ground.
Pin 4 from the left downstream 1/2 should go to pin 31 at connector c1 at the PCM, and pin4 from 2/2 should go to pin 33 at c1 at the PCM.
Pin 1 at sensor 1/2 goes to c3 pin 9 , and pin 1 at 2/2 sensor goes to c3 pin 10.
That's how the downstream sensors should be ran.
Now upstreams : same deal, pins 3 at the upstream sensors both go to 1 single wire up to the PCM to connector c1 pin 32.
Both pin 2 wires go to chassis ground again.
Pin4 1/1 goes to pin 31 at c2 , pin 4 at 2/1 goes to c2 pin 33
Pin 1 at 1/1 goes to c2 pin 18 and pin 1 at 1/2 goes to c2 pin 17.
But however, keep in mind you're basically having to add only the 2/1 sensor and the 2/2 sensors. You're adding the right bank in wiring. I got confused by that my first go around and actually wired everything up all messed up and had to start over.
Maybe u looked over the wiring and got confused at to what sensors you're adding. Look over them very carefully. Try and compare them as much as you can. It took me a while to get everything right with what I needed. But it all worked out.
Hopefully this helps.
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