# Commission Regulation (EU) 2017/1151 of 1 June 2017 supplementing Regulation (EC) No 715/2007 of the European Parliament and of the Council on type-approval of motor vehicles with respect to emissions from light passenger and commercial vehicles (Euro 5 and Euro 6) and on access to vehicle repair and maintenance information, amending Directive 2007/46/EC of the European Parliament and of the Council, Commission Regulation (EC) No 692/2008 and Commission Regulation (EU) No 1230/2012 and repealing Commission Regulation (EC) No 692/2008 (Text with EEA relevance), Division 3.8.1


The family correction factor, FCF, shall be calculated as follows:
FCF = MCO2,Treg/MCO2,23°
where
MCO2,23°is the CO2 mass emission of the average of all applicable Type 1 tests at 23 °C of vehicle H, after Step 3 of Table A7/1 of Sub-Annex 7 for pure ICE vehicles and after Step 3 of Table A8/5 for OVC-HEVs and NOVC-HEVs, but without any further corrections, g/km;
MCO2,Tregis the CO2 mass emission over the complete WLTC cycle of the test at regional temperature after Step 3 of Table A7/1 of Sub-Annex 7 for pure ICE vehicles and after Step 3 of Table A8/5 for OVC-HEVs and NOVC-HEVs but without any further corrections, g/km. For OVC-HEVs and NOVC-HEVs, the KCO2 factor as defined in Sub-Annex 8 Appendix 2 shall be used.
Both MCO2,23° and MCO2,Treg shall be measured on the same test vehicle.
The FCF shall be included in all relevant test reports.
The FCF shall be rounded to 4 points of decimal.

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Source: https://www.legislation.gov.uk/eur/2017/1151/annex/Sub/6a/division/division/3./division/3.8./division/3.8.1. (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-1151/annex-Sub/6a/division/division-3./division-3.8./division-3.8.1.
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.