No idea what it looks for. This is the Democratic Peoples Republic of Massachusetts (DPRM for short), so there are no limitations as to how far they will try to go. He did say that they told him at the first failure that two sensors were not showing up. I wasn't there, so I can't provide any further info than that. He has something like a Hypertech programmer (forgot which brand), so he reflashed it back to stock.
My car with the stock tune trips the misfire code and catalyst efficiency code due to the cam and high flow cat. I have them both set to not report and have not had a problem in the past. He has been through emissions before without a problem also, so it must be something new they look for this year.
