Section 85.1701 - General applicability(a) The provisions of this subpart regarding exemptions are applicable to new and in-use motor vehicles and motor vehicle engines, except as follows: (1) Beginning January 1, 2014, the exemption provisions of 40 CFR part 1068, subpart C, apply instead of the provisions of this subpart for heavy-duty motor vehicle engines and heavy-duty motor vehicles regulated under 40 CFR part 86, subpart A, 40 CFR part 1036, or 40 CFR part 1037, except that the nonroad competition exemption of 40 CFR 1068.235 and the nonroad hardship exemption provisions of 40 CFR 1068.245 , 1068.250 , and 1068.255 do not apply for motor vehicle engines. Note that the provisions for emergency vehicle field modifications in § 85.1716 continue to apply for heavy-duty engines.(2) Prior to January 1, 2014, the provisions of §§ 85.1706 through 85.1709 apply for heavy-duty motor vehicle engines.(b) The provisions of 40 CFR 1068.10 and 1068.11 apply for information you submit under this subpart.(c) References to engine families and emission control systems in this subpart or in 40 CFR part 1068 apply to durability groups and test groups as applicable for manufacturers certifying vehicles under the provisions of 40 CFR part 86, subpart S.(d) In a given model year, manufacturers of motor vehicles and motor vehicle engines may ask us to approve the use of administrative or compliance procedures specified in 40 CFR part 1068 instead of the comparable procedures that apply for vehicles or engines certified under this part or 40 CFR part 86. 76 FR 57374 , Sept. 15, 2011, as amended at 81 FR 73972 , Oct. 25, 2016; 86 FR 34363 , June 29, 2021; 88 FR 4472 , Jan. 24, 2023 81 FR 73972 , 12/27/2016; 86 FR 34363 , 7/29/2021; 88 FR 4472 , 3/27/2023