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It also contains emissions limits for vehicles fitted with advanced emissions control systems, such as 3-way catalytic converters, and offers general advice to motorists and vehicle operators on submitting vehicles for test.
The booklet deals with petrol and diesel vehicles separately.
To download a copy of the booklet please go to https://www.gov.uk/government/publications/in-service-exhaust-emission-standards-for-road-vehicles-18th-edition