the EPA has said that the engines had computer software that could sense test scenarios by monitoring speed, engine operation, air pressure and even the position of the steering wheel.
Does any place still do exhaust tests on cars that are new enough to have the on-board diagnostics (1997 I think)? I know when I get my car tested, they just plug it in and don't do any actual measurements from the exhaust (they do measure the leakage from the gas cap, though).
In that case, why not just have it detect when the car is connected and turn on the emissions management then? The air pressure is dependent on your height above sea level, and steering position is irrelevant if the car is rear wheel drive on a moving road.
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