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Originally Posted by P-hack
They make it sound like some sophisticated AI software thing that is nefariously looking for epa test conditions somehow. It is probably as simple/common as full throttle enrichment.
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Accoring to the EPA it apparently it DOES look for specific conditions that are found during the EPA test and it runs more rich during the test to reduce the NOx emissions.
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The EPA said the device senses the testing environment by analyzing a variety of data — steering position, speed, duration of engine operation and barometric pressure.
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VW cheated on U.S. pollution tests for 'clean diesels' - LA Times
The "fix" for this will likely be a reprogramming of the CPU to operate under the the more rich test conditions more often or at all times. This will directly result in lower fuel economy...