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Failed inspection for emissions on 2001 Hyundai Elantra

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I just bought a car, and it won't pass inspection because it keeps coming back as failed, emission sensor not ready. I was told to drive high speed on highway. I did this a few times, and it's still not ready. What can be done? Please help me.
(2) Answers
Sounds like the drive cycle is not being completed. Learn more about Drive Cycles here:
http://repairpal.com/drive-cycle-emissions-readiness
http://repairpal.com/Drive-Cycle-Issues
http://repairpal.com/drive-cycle-how-to-perform-a-basic-drive-cycle