Hey Ryan you may want to chime into my thread on HPT forum about Codys GS with the changes you made. I posted a reply to you finding the cause and it was with TC but it will have more credit coming straight from the horses mouth!
Would a rear O2 Sim allow the test to complete and prevent this from happening? If so it might be a good option for those without access to your specific tuning software (What do you use anyway?)
An 02 sim does not fix this problem. I know this because the car I had trouble with already had one on it that works fine and removing it made no changes and the condition actually lessoned with nothing in place
