Question to the Department for Transport:

To ask the Secretary of State for Transport, what estimate her Department has made of the potential impact of non-compliant diesel vehicles on the UK’s ability to meet its legally binding carbon budgets and net-zero targets.

Emissions projections for diesel vehicles used in carbon budgets modelling account for the difference between reported vehicle CO2 emissions, tested currently using the World Light Duty Test Procedure, and emissions from vehicles operating in ‘real-world’ driving conditions.

The Department for Transport, through the Driver and Vehicle Standards Agency, is leading investigations into suspected non-compliant diesel vehicles under assimilated Regulation (EU) 2018/858. Where non-compliance is identified, manufacturers are required to take corrective action.