Commission Implementing Regulation (EU) 2025/1707 of 25 July 2025 laying down rules for the application of Regulation (EU) 2024/1257 of the European Parliament and of the Council as regards specific methods, requirements and tests, including compliance thresholds, for OBFCM devices and OBM systems, characteristics and performance of driver warning systems and inducement methods and methods to assess their operation, EVP format and data and methods of communication of EVP data of motor vehicles of categories M1 and N1

Article 1

Subject matter and scope

This Regulation lays down measures for the implementation of Regulation (EU) 2024/1257, with regard to the following:

(a) on-board monitoring (OBM) systems including their sensors and driver warning systems;

(b) on-board fuel and electric energy consumption monitoring (OBFCM) devices;

(c) the format and data and off-board communication methods for the environmental vehicle passport (EVP);

(d) methods for in-vehicle display of environmental data about the vehicle type and the environmental performance of the individual vehicle;

(e) methods and procedures to establish the absence of manipulation devices and manipulation strategies.

This Regulation applies to the motor vehicles belonging to the following vehicle categories:

(a) M1 and N1;

(b) N2 designated as ‘Euro 7ext’ and ‘Euro 7Gext’ in accordance with Article 5 of Regulation (EU) 2024/1257.

Article 2

Definitions

For the purpose of this Regulation, the following definitions shall apply:

(1) ‘OBM data’ means data produced by the ‘on-board monitoring system’ or ‘OBM system’, including battery durability data;

(2) ‘OBM trip’ means each period of vehicle operation that starts with the activation of the propulsion system and ends with the deactivation of the propulsion system. For the purpose of determining the end of an OBM trip, sequences of engine shut-off events followed by an engine re-start commanded by the vehicle control system (as a result of the operation of stop-start systems, hybrid vehicle control or automatic stall recovery) shall not be considered a deactivation of the propulsion system;

(3) ‘OBM trip data’ means OBM data that relate to a particular OBM trip;

(4) ‘OBM hash function’ means a standard mathematical algorithm implemented on-board the vehicle that takes a set of OBM data and converts it into a string of characters with a fixed predetermined length, and whose properties can be used to randomly select OBM data to be transmitted over the air, or to verify the integrity of the transmission of OBM data while preserving their anonymous nature;

(5) ‘OBM hash value’ means the output of the OBM hash function for a given input;

(6) ‘OBM data schema’ means a fixed structure for data that are input to the OBM hash function;

(7) ‘generic scan tool’ means an external test equipment used for standardised off-board communication with the vehicle’s electronic control systems;

(8) ‘service tool’ means a specialised external test equipment used to perform manufacturer-defined service operations via communication with the vehicle’s electronic control systems;

(9) ‘QR code’ means a machine-readable matrix code that links to information;

(10) ‘Auxiliary Emission Strategy’ or ‘AES’ means an emission strategy that becomes active and replaces or modifies a BES for a specific purpose and in response to a specific set of ambient or operating conditions and only remains operational as long as those conditions exist;

(11) ‘Base Emission Strategy’ or ‘BES’ means an emission strategy that is active throughout the speed and load operating range of the vehicle unless an Auxiliary Emission Strategy is activated.

Article 3

General requirements for OBM systems

Article 4

General requirements for the excess exhaust emissions driver warning system

The manufacturer shall ensure that the excess exhaust emissions driver warning system (EEEDWS) performs the following functions:

(a) assign the OBM monitoring status of NOx and particulate matter (PM) in accordance with Article 5;

(b) provide driver warnings in accordance with Annex II as long as one or more of the exhaust emissions monitoring statuses is in ‘Error’ status;

(c) if driver warnings referred to in point (b) are not acted upon within the period specified in Annex II, limit vehicle use through harmonised inducement methods described in that Annex until appropriate repairs are carried out.

Article 5

OBM monitoring status of exhaust emissions

The manufacturer shall ensure that each OBM monitoring status is individually set. Each OBM monitoring status may be updated once after the end of each OBM trip as one of the following:

(a) ‘Normal’ status, which shall indicate that the emissions control systems installed on the vehicle are judged to be functioning adequately and the OBM system has high confidence in the accuracy of OBM monitoring;

(b) ‘Intermediate’ status, which shall indicate that the OBM system is unable to make a conclusive assessment of the status of the relevant emissions control systems or that an increased uncertainty in OBM monitoring values may exist;

(c) ‘Error’ status, which shall indicate that faults or tampering that prevent adequate emissions control or monitoring and justify a repair have been identified.

As an indicative target when designing the OBM system, the manufacturer shall ensure that if the OBM determines that the vehicle may be in a state where its exhaust emissions as evaluated via a real-driving emissions (RDE) or other applicable in-service conformity test would be equal or higher than 2,5 times the applicable emission limit, the ‘Error’ status shall be activated.

Article 6

Calculation of NOx emissions for each OBM trip

The calculation referred in paragraph 1 shall provide a reasonable indication of real-world exhaust emissions of NOx based upon any of the following elements:

(a) measurements performed by on-board sensors;

(b) modelled data;

(c) a combination of measurements performed by on-board sensors and modelled data.

Article 7

Calculation of other OBM data for each OBM trip

Article 8

Calculation of hash value and on-board processing of OBM data

Article 9

Over-the-air transmission of OBM data

Article 10

Access to OBM data via OBD port

Article 11

Submission of anonymous OBM data

Article 12

Requirements for emission type-approval

Article 13

In-service conformity checks of OBM systems

Measures to ensure in-service conformity of OBM systems shall be taken in accordance with the conformity of production arrangements as laid down in Article 31 of Regulation (EU) 2018/858, Annex IV to Regulation (EU) 2018/858 and Part A of Annex IV to this Regulation.

Article 14

OBM monitoring status and eligibility of vehicles for in-service conformity checks

During in-service conformity testing of exhaust emissions in accordance with Article 10 of Implementing Regulation (EU) 2025/1706, the following shall be considered as warning signals that may suggest malfunctioning in accordance with point 8.3.2 of UN Regulation No 168 (³):

(a) the presence of one or more OBM monitoring statuses set to ‘Error’ as referred to in Article 5(1), point (c);

(b) the presence of one or more ongoing OBD faults for which a malfunction indicator is active;

(c) other faults that are apparent from a visual inspection of the vehicle prior to the trip.

Article 15

Market surveillance of OBM systems

Market surveillance authorities shall perform a verification of the compliance of OBM systems with the Articles 3 to 10 in accordance with part B of Annex IV.

Article 16

Requirements for OBFCM devices

Article 17

Environmental vehicle passport

Article 18

In-vehicle display of environmental data

The manufacturer shall ensure that the environmental data about the vehicle type and the environmental performance of individual vehicles listed in Annex VI are displayed inside the vehicle in accordance with that Annex.

Article 19

Manipulation devices and manipulation strategies

Article 20

Entry into force

This Regulation shall enter into force on the twentieth day following that of its publication in the Official Journal of the European Union.

This Regulation shall be binding in its entirety and directly applicable in all Member States.

LIST OF ANNEXES

ANNEX I	OBM data
Part A	Parameters and signals used by the OBM system
Part B	OBM hash function and on-board processing of OBM data
Part C	Over-the-air transmission of OBM data
Appendix 1	OBM parameters to support vehicle testing
Appendix 2	OBM trip parameters
Appendix 3	OBM lifetime parameters
Appendix 4	OBM outbox property parameters
Appendix 5	Battery durability parameters
Appendix 6	OBM data storage parameters
Appendix 7	OBM data schemas
Appendix 8	OBM data processing flowchart
ANNEX II	Driver warnings and inducement methods of the excess exhaust emissions driver warning system
Appendix 1	Schematic diagrams
ANNEX III	Declaration of compliance
Appendix 1	Manufacturer’s declaration of compliance with the OBM requirements for the purposes of type-approval
Appendix 2	Simple demonstration of the functioning of the OBM system. Workflow description and steps
ANNEX IV	Methods for in-service conformity checks and market surveillance of OBM systems
Part A	In-service conformity checks of OBM systems
Part B	Market surveillance of OBM systems
ANNEX V	Environmental vehicle passport
Appendix 1	Environmental vehicle passport parameters
ANNEX VI	In-vehicle display of environmental data
Appendix 1	Parameters to be displayed inside the vehicle
ANNEX VII	Manipulation devices and manipulation strategies

ANNEX I

This Annex describes the requirements related to OBM data. It provides the technical specification of the parameters produced by the OBM system, the requirements for on-board processing of OBM data and for its over-the-air transmission.

Detailed technical specification of certain OBM parameters is provided in Part A of this Annex. A comprehensive list of parameters with a basic technical specification is provided in Appendices 1 to 6.

The requirements for on-board processing and over-the-air transmission of OBM data are covered in Part B of this Annex. The OBM data schemas are defined in Appendix 7. Appendix 8 is an illustrative flowchart of the OBM trip data processing.

Part C of this Annex contains supplemental technical specifications for the over-the-air transmission of OBM data.

PART A

OBM parameters

The manufacturer shall make all parameters listed in Appendices 1 and 3 to 6 to this Annex available on demand through the serial port on the standardised data link connector according to the specifications in those Appendices.

Unless otherwise specified, manufacturers shall make available parameters encompassing their full useful value range, with a level of accuracy commensurate with the capabilities of the control systems.

1. OBM parameters to support vehicle testing

1.1.For those parameters where it is indicated in Appendix 1 that they are part of the instantaneous data stream, these shall be updated by the applicable control unit at a minimum frequency of 1 Hertz.

1.2.Parameters that are not applicable to the vehicle fuel type or powertrain technology may be omitted.

1.3. Exhaust mass flow-tailpipe (parameter 1.11)

1.3.1.The OBM system shall provide a parameter ‘Exhaust mass flow – tailpipe’ to indicate the total exhaust mass flow at the tailpipe.

The parameter shall be calculated as the average mass of exhaust mass flow during the previous 1 second prior to being updated and shall be updated at least once per second.

1.4. Tailpipe NOx concentration (parameter 1.13)

1.4.1.The OBM system shall provide a parameter ‘Tailpipe NOx concentration’ to indicate the NOx emission concentration at the tailpipe. The parameter shall be provided for the whole duration of the OBM trip and may be based on sensor measurement, modelled data, or a combination thereof.

1.4.2.The parameter shall be calculated as the average concentration of NOx emissions during the previous 1 second prior to being updated and shall be updated at least once per second.

1.5. Modelled status (parameters 1.14 and 1.16)

1.5.1.The OBM system shall provide parameters ‘Tailpipe NOx concentration modelled status’ and ‘Tailpipe NOx mass flow modelled status’ to indicate how the tailpipe NOx concentration and mass flow concentration values are determined. Both parameters shall have either one of the following two statuses:

[0]. indicates that the applicable parameter value is calculated with NOx sensor input.

[1]. indicates that the applicable parameter value is calculated without NOx sensor input.

1.6. Tailpipe NOx mass flow (parameter 1.15)

1.6.1.The OBM system shall provide a parameter ‘Tailpipe mass flow’ to indicate the NOx emission mass flow at the tailpipe. The parameter shall be provided for the whole duration of the OBM trip and may be based on sensor measurement, modelled data, or a combination thereof.

1.6.2.The parameter shall be calculated as the average mass of NOx emissions during the previous 1 second prior to being updated and shall be updated at least once per second.

1.7. NOx to fuel mass ratios (parameters 1.19 - 1.27)

1.7.1.The OBM system shall provide separate parameters to calculate the ratio between NOx emissions and the fuel mass. This calculation process starts with all values of ‘NOx to fuel mass ratio (i)’ set to a default value of zero, and consists of the following three steps:

1.7.2.STEP 1: The following three parameters shall be calculated:

(a) ‘Cumulative NOx – 100 km’ (g) (parameter 1.19). This parameter integrates the ‘tailpipe NOx mass flow’ (g/s). The parameter shall have a resolution of 0,0001g or any smaller mass, a minimum value of zero and a maximum value of at least 100 000  g.

(b) ‘Cumulative fuel mass – 100 km’ (kg) (parameter 1.20). This parameter integrates the ‘Engine fuel flow’ (g/s), with a conversion from the unit grams into kilograms. The parameter shall have a resolution of 0,0000001 kg or any smaller mass, a minimum value of zero and a maximum value of at least 200 kg.

(c) ‘Cumulative distance – 100 km’ (km) (parameter 1.21). This parameter integrates travelled distance by the vehicle. The parameter shall have a resolution of 0,01 km or any smaller distance, a minimum value of zero and a maximum value of at least 100 km.

1.7.2.1.These parameters shall be continuously integrated, except when at least one of the following conditions apply:

(1) the engine is off;

(2) the time after first engine start during the OBM trip is less than 800 seconds;

(3) the parameter ‘Aftertreatment regeneration status’ (parameter 1.28) indicates that an active particulate filter regeneration is in progress;

(4) the ambient temperature is below -7 °C or above 38 °C;

(5) the vehicle speed is above 160 km/h;

(6) the altitude is above 1 300  m above mean sea level;

(7) a tracked auxiliary emission strategy (AES) monitored by OBM is active as defined in paragraph 2.8.2;

(8) when the vehicle is in a long cooldown phase;

(9) when at least one of ‘Monitoring status NOx’ or ‘Monitoring status generic’ is set to ‘Error’ or ‘Intermediate’. In this case, these parameters shall also be reset to zero;

(10) when an input signal used to calculate any of the cumulated parameters above is deemed to be malfunctioning.

1.7.2.2.For the purposes of the integration of parameters 1.19 to 1.21, a ‘long cooldown phase’ shall be understood as covering the following periods:

— For a period of continuous idling, any period exceeding the first 180 seconds.

— The first 180 seconds after the vehicle reaches a speed above 1 km/h following a continuous idling period exceeding 180 seconds.

— The first 180 seconds after a restart of the engine following a continuous engine-off period exceeding 180 seconds.

1.7.2.3.When the parameter ‘Cumulative distance – 100 km’ is equal or higher than 100 km, the following step shall be executed:

1.7.3.STEP 2:

The value of ‘NOx to fuel mass ratio (3)’ shall be assigned to ‘NOx to fuel mass ratio (4)’

The value of ‘NOx to fuel mass ratio (2)’ shall be assigned to ‘NOx to fuel mass ratio (3)’

The value of ‘NOx to fuel mass ratio (1)’ shall be assigned to ‘NOx to fuel mass ratio (2)’

The value of ‘NOx to fuel mass ratio (0)’ shall be assigned to ‘NOx to fuel mass ratio (1)’

The following parameter shall be calculated:

When ‘NOx to fuel mass ratio (0)’ has been calculated, the parameters ‘Cumulative NOx – 100 km’, ‘Cumulated fuel mass – 100 km’ and ‘Cumulated distance – 100 km’ shall all be reset to zero.

Prior to first calculation of each ‘NOx to fuel mass ratio’ parameter since the manufacture of the vehicle, or if the ‘NOx to fuel mass ratio’ parameters are reset during a control unit reprogramming event, or by control unit replacement, a default value of 0xFF for each data byte shall be used.

1.7.4.STEP 3:

The parameter ‘NOx to fuel mass ratio average’ (g/kg) (parameter 1.27) shall be calculated as follows:

With n being the number of ‘NOx to fuel mass ratio (i)’ values not equal to 0xFFFF.

1.7.4.1.The parameters ‘Cumulative NOx – 100km’, ‘Cumulative fuel mass – 100 km’ and ‘Cumulative distance – 100km’ shall all be reset to zero, and the sequence is repeated from step 1.

1.7.4.2.The ‘NOx to fuel mass ratio (i)’ parameters and the ‘NOx to fuel mass ratio average’ parameter shall consist of 2 data bytes with a minimum value of zero and a maximum value of 200 g/kg.

1.7.4.3.The parameters ‘Cumulative NOx – 100 km’, ‘Cumulative fuel mass – 100 km’ and ‘Cumulative distance – 100 km’ shall be reset to zero when diagnostic trouble codes are reset by a generic scan tool or service tool These parameters may also be reset to zero in case of an ECU reprogramming event.

1.8. Aftertreatment operational status (parameter 1.31)

1.8.1.The OBM system shall provide a parameter ‘Aftertreatment operational status’ to indicate whether the aftertreatment system has reached and maintains the conditions to allow effective abatement of exhaust emissions monitored by the OBM system. This parameter shall have either one of the following two statuses:

[0]. indicates that the actual conditions do not allow for effective abatement of exhaust emissions monitored by the OBM system.

[1]. indicates that the actual conditions allow for effective abatement of exhaust emissions monitored by the OBM system.