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  1. E

    Help identifying wire disconnected by firewall, back of manifold.

    Yep, I agree that it's not likely to be the reason for the cat code
  2. E

    Help identifying wire disconnected by firewall, back of manifold.

    I disabled the AFM with a Diablo scanner. It's the second engine in the Yukon. The scanner came with a crate engine, it was pre-programmed to disable the AFM.
  3. E

    Help identifying wire disconnected by firewall, back of manifold.

    That's it .. thanks!
  4. E

    Help identifying wire disconnected by firewall, back of manifold.

    At first I thought it plugged in next to the oil sensor, the clip looked like it had a spot for it, but it it doesn't fit next to it. I cleared the two codes that were there. One was an evap code, the other is a catalyst system code p0420. Now that I plugged that evap hose back in, the EVAP...
  5. E

    Help identifying wire disconnected by firewall, back of manifold.

    2013 GMC Yukon XL 5.3L vortec Hey y'all. I would really appreciate some help. I can't seem to identify this wire by the back of the manifold. It's part of a harness coming out by the firewall. I've included a picture. Recent history of the situation : Yukon is throwing evap codes. I had it at...

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