CFR > Title 40 > Chapter I > Subchapter U > Part 1042 > Subpart F CFR > Title 40 > Chapter I > Subchapter U > Part 1042 > Subpart F – Test Procedures Current as of: 2024 | Check for updates | Other versions § 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?