One of the few outstanding issues is the procedure for future decisions on real driving emission tests, specifically related to the conformity factor (ratio between the limit for a pollutant as measured in the test and the regulatory limit for that pollutant).
The Council is proposing to guarantee the full involvement of both co-legislators (the Council and the European Parliament) to replace the existing procedure, which only provides them with a right to veto a proposal voted by a Commission technical committee. However, this issue will need to be discussed further, possibly in a next trilogue meeting.
The new piece of legislation would amend both the regulation for light-duty vehicles (Euro 5/6) and the one for heavy-duty vehicles (Euro VI).