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What is tampering?
According to Revised Code section 3704.16, tampering means "to remove permanently, bypass, defeat or render
inoperative, in whole or in part, any emission control system that is installed on or in a motor vehicle."
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Tampering involves such acts as willfully removing the converter, air pump, computer controls, etc.
EGR deletes(whether hardware only, software only or both) are rampant on gasoline engines and from what i'm told, diesel as well. that alone certainly qualifies.