CHICAGO – The recent startup of the Illinois Environmental Protection Agency's (IEPA) unique onboard diagnostic (OBD)-based emissions test program is a harbinger of problems that lie ahead. Although the U.S. EPA tried hard to prevent it, the Illinois program – unlike other state-run, OBD-based, emissions tests – takes vehicles that indicate OBD faults during the test and immediately dynamometer-tests them. The U.S. EPA does not want to see OBD-based emissions tests in a comparative ...

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