Pursuant to frequent requests for information received by the . Environmental Protection Agency (EPA) regarding the legality and effects of engine switching, this document will summarize federal law and policy pertaining to this matter, and will discuss other related issues. A. Federal Law The federal tampering prohibition is contained in section 203(a)(3) of the Clean Air Act (Act), 42 . 7522(a)(3). Section 203(a)(3)(A) of the Act prohibits any person from removing or rendering inoperative any emission control device or element of design installed on or in a motor vehicle or motor vehicle engine prior to its sale and delivery to.
