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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
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Title 40
Chapter I
Part 1051
Subpart C - Subpart C—Certifying Engine Families
§ 1051.201 - What are the general requirements for obtaining a certificate of conformity?
§ 1051.205 - What must I include in my application?
§ 1051.210 - May I get preliminary approval before I complete my application?
§ 1051.220 - How do I amend the maintenance instructions in my application?
§ 1051.225 - How do I amend my application for certification to include new or modified vehicle configurations or to change an FEL?
§ 1051.230 - How do I select engine families?
§ 1051.235 - What emission testing must I perform for my application for a certificate of conformity?
§ 1051.240 - How do I demonstrate that my engine family complies with exhaust emission standards?
§ 1051.243 - How do I determine deterioration factors from exhaust durability testing?
§ 1051.245 - How do I demonstrate that my engine family complies with evaporative emission standards?
§ 1051.250 - What records must I keep and make available to EPA?
§ 1051.255 - What decisions may EPA make regarding a certificate of conformity?
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