Okay, I can accept there may be a legitimate reason to want to determine if a test is being run for a case like that, but that&#x27;s a component that isn&#x27;t related to engine performance and emissions.  I&#x27;m not sure there&#x27;s any case where you could <i>legitimately</i> want the engine performance and emissions to be different during emissions testing.  In any case you want it different (for example, testing different parameters), you would also want to test it on the road.