Two full I/M-240 and OBD-II (onboard diagnostics) emissions tests of a 2L 1996 car at an Illinois EPA I/M emissions test station confirm the National Research Council’s recent conclusion that OBD-II alone should not be used to evaluate vehicle emissions. The two tests, run with a vehicle designated by Illinois EPA as 225MXR, had tailpipe emissions of 0.02 gpm HC, 0.7 gpm CO and zero NOx per the second test, which is nearly identical to the first test. These values respectively are 3.3% and ...

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