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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
All Titles
Title 40
Chapter I
Part 1042
Subpart F - Subpart F—Test Procedures
§ 1042.501 - How do I run a valid emission test?
§ 1042.505 - Testing engines using discrete-mode or ramped-modal duty cycles.
§ 1042.515 - Test procedures related to not-to-exceed standards.
§ 1042.520 - What testing must I perform to establish deterioration factors?
§ 1042.525 - How do I adjust emission levels to account for infrequently regenerating aftertreatment devices?
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