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Re: 2002 grand prix wont pass the emisson
The evap flag is usually the hardest to reset......
Check for codes and clear again......
Next day with the engine cold, start vehicle, and just let it idle to normal operating temperature.......Then, with temp 190-200, take vehicle out on the highway.......do several accelerations and decelerations, like 40-65, and 65-40.....cruise awhile....exit highway, come to a stop, then turn around and repeat on the way home.....usually works for me.....
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