UN R49 Supplement 5 (07 series) · UNECE Regulation No. 49 (ECE R49) — Uniform provisions concerning the measures to be taken against the emission of gaseous and particulate pollutants from compression-ignition engines and positive ignition engines for use in vehicles.
UN R49 — Supplement 5 to the 07 series of amendments
Supplement 4 → 5
- What changed
- Paragraph 9.3.2.7. of Annex 4 now sets the accuracy of the air to fuel measurement sensor for three ranges of λ.
- To fulfil this accuracy, the sensor must be calibrated as specified by the instrument manufacturer.
- Why
- The proposer says that these wordings were omitted by mistake in ECE/TRANS/WP.29/GRPE/2025/12.
Q1What changed5 changes
Accuracy of the air to fuel measurement sensor (Annex 4, para. 9.3.2.7.)
Paragraph 9.3.2.7. of Annex 4 now sets the accuracy of the sensor with incorporated electronics. For λ < 2, the accuracy must be within ±3 per cent of reading. For 2 ≤ λ < 5, it must be within ±5 per cent of reading. For 5 ≤ λ, it must be within ±10 per cent of reading. To fulfil this accuracy, the sensor must be calibrated as specified by the instrument manufacturer.
Q2Why it changed
- Proposed by
- Experts from the International Organization of Motor Vehicle Manufacturers (OICA)
- Working party
- GRPE, 94th session (March 2026)
Reasons
At its 92nd session, GRPE adopted ECE/TRANS/WP.29/GRPE/2025/12 to introduce some alternative analysers in paragraphs 9.3.2.8. and 9.3.2.9. The proposer says that the previous paragraph was shortened by mistake, and that this proposal brings its full text back.
Sources (2)
“During its 92nd session, GRPE adopted a working document ECE/TRANS/WP.29/GRPE/2025/12 from EU Commission, to introduce some alternative analysers in paragraphs 9.3.2.8. and 9.3.2.9.”
“the previous paragraph was shortened by mistake and this proposal is to bring the full text of paragraph 9.2.3.7. back”
Document trail
- 2026-01ProposalECE/TRANS/WP.29/GRPE/2026/17Official proposal by the experts from OICA
- —Working party adoptsECE/TRANS/WP.29/GRPE/94Session report, para. 32
- 2026-08Sent to WP.29ECE/TRANS/WP.29/2026/173Text that GRPE sent to WP.29 and AC.1
- PendingWP.29 voteScheduled for the 200th session (17–20 November 2026)
- PendingIn forceDate not yet known
Q3Who is affected
Vehicle manufacturer
- Make sure that the air to fuel measurement sensor meets the new accuracy limits for each range of λ.
- Calibrate the sensor as specified by the instrument manufacturer.
Component supplier
- No direct action for this role.
Technical service / Approval authority
- Check that the air to fuel measurement sensor meets the new accuracy limits.
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ⓘ This report gives advice only. It is not legal or type-approval advice.
More UN R49 change reports
- 07 series — Supplement 4
- 07 series — Supplement 3, Corrigendum 1
- 07 series — Supplement 3
- 07 series — Supplement 2
- 07 series — Supplement 1
- 07 series — Base text
- 06 series — Supplement 11
- 06 series — Supplement 10
- 06 series — Supplement 9
- 06 series — Supplement 7
- 06 series — Supplement 6
- 05 series — Supplement 12
- 05 series — Supplement 11
- 05 series — Supplement 10