What does it cover?
UN R143 addresses heavy-duty dual-fuel engine retrofit systems (HDDF-ERS) fitted to specified M- and N-vehicle engines. Its scope is linked to defined Euro V and EEV approvals under the 05 series of R49. System family, application range and demonstration engine are defined together.
Who is it for?
For vehicle and retrofit system manufacturers, converters and technical teams preparing modification files.
Which subjects are addressed?
- HDDF-ERS dual-fuel retrofit systems
- R49 Euro V and EEV scope
- System family and demonstration engine
Common question
Does R143 cover every heavy-duty diesel engine?
No. Its scope follows specified R49 approval levels and an application range. Vehicle mass alone cannot determine applicability without the existing engine approval.
Published RegsUP edition
This page is tied to the published RegsUP working edition below; it is not an official consolidated text.
RegsUP record title: R143 — UN Regulation No. 143
Working series: 00 · Included supplement: 1
RegsUP edition publication date:
This is the RegsUP publication decision date, not the date the regulation entered into force.