[AhlingtonBMW]

MA abides by the CARB standards (the California standards). In addition to looking for ready monitors and all of that which has been highlighted already, when they plug you into the state's networked computer they check for the original factory software (or a tune that has an EO#). In my case, they sent me to Motor Assistance Center (MAC) before any inspection station was able to print a valid sticker for my car.

ESS can provide some guidance on the above, but the inspector is also supposed to do a visual look under the hood too. That's the issue I haven't had any luck navigating around...