Article 9 1.

where the CO2 emission values of heavy-duty vehicles in service as a result of verifications performed in accordance with the procedure referred to in Article 13 of this Regulation deviate from the values that are indicated in certificates of conformity or in the customer information file referred to in Article 9(4) of Regulation (EU) 2017/2400;

where errors, due to incorrect input data or other causes, in the execution of the CO2 emissions determination were identified;

where errors in the execution of the CO2 emissions monitoring and reporting were identified;

any deviations other than those referred to in point (a), (b) or (c).