The agenda includes transposition of UN-GTR 2 into UN R40, with discussions on Euro 4 level amendments, maximum power determination for two-wheelers, battery electric vehicle range standardization using SAE J2982 procedures, and deterioration factors in GTR 23.

Proposal for a 03 series of amendments, modifying para. 5.4.1.4 (Table 5) to change emission limits for Classes 1, 2, and 3, amending para. 5.4.2.2 to establish CO measurement requirements at idle, adding para. 5.4.4.3 to establish requirements for O₂ content and lambda measurement at high idle with specified calculation methods, modifying para. 12 to change transitional provision references from 02 to 03 series, and inserting comprehensive new technical requirements throughout Annexes 1 through 7 and their Appendices 1 through 12 concerning vehicle propulsion unit families, test procedures for Type I, Type II and Type VII tests, exhaust dilution systems, driving cycles, gearshift procedures, reference fuels, chassis dynamometer specifications, and related emissions testing methodologies applicable to vehicles of category L₃, L₄ and L₅.

The 73rd EPPR Informal Working Group Meeting on Environmental and Propulsion Performance Requirements of L-category vehicles was held 1 June 2026. The agenda and previous meeting report EPPR-72-03 were adopted without changes. The IWG discussed transposing UN-GTR No. 2 to Euro 3, 4, and 5 emission levels through incremental steps; the new 02 series of amendments to R40 was adopted by March 198/WP.29 (WP.29/2026/24), and IMMA presented a draft 03 series for Euro 4 level. The IWG agreed to identify legislative gaps via questionnaire due 26 June. Information was exchanged on maximum power determination, battery electric vehicle range determination standardization using SAE J2982, and deterioration factors in GTR 23 on durability. The next meetings are scheduled for 8 July 2026, 7 September 2026, and October 2026.