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How did you find the issue with the short and what did you do to fix it? I'm having the same issue, cleaned my EGR valve and tube twice already and replaced with another and I'm still getting p0403.

I was using the relay that came with the Amazon harness. Everything is working great now, thanks!

Is there a wire that's supposed to be grounded to the chassis? I just have the negative connected to my negative battery terminal. I can post pics later today

Just sliced the two Amazon wires into one and connected it into the stock harness, still nothing.

I don't think I'm understanding. Here's what I have wired up right now

So they don't go back into the stock horn harness, they just go into each other?

Weird. my harness doesn't fit the stock harness at all.

How did you connect the stock harness to the Amazon kit?