I think part of the programming was gaming the ppm by diluting it with extraneous airflow. Since that’s a cheat of sorts, there’s no programming solution.
I am trying to guess how the car knew it was connected and being tested
It can only be through the electronic interface, and something in that interface says “I’m connected”
That would turn on/off the cheat.
I almost bought one of these things- I did a test drive over a weekend and I got nearly 80 MPH on the thruway. the dealership was a bit miffed that I put 400 miles on it