yea I just used the test plug, and it did not cause any codes. It took my p401 egr code away.Yeah, I have all of those - you can see one of the keychains in the picture of my upper intake. I just decided to also remove the EGR VSV from under the intake plenum. I wasn't sure if unplugging that connector would cause a code. I did some more digging and found a post that seems to indicate that it should be fine.