DfT Proposes Unlimited Fines for Removing Emissions Filters on Vehicles From 2001 Onwards

• The Department for Transport has proposed that stripping a diesel particulate filter, catalytic converter, AdBlue system or EGR valve from any vehicle first used on or after 1 January 2001 would be unlawful in every case.
• Prosecution in a magistrates’ court would carry fines “between £1000 and an unlimited amount”, and the rule would treat poor maintenance and deliberate modification in the same way.
• Nothing is law yet: the consultation closed on 6 September 2026, and the department expects legislation in summer 2027 with a six month lead in proposed.

DfT Wants Unlimited Fines for Anyone Who Strips Emissions Filters From a Car or Van

The Department for Transport has asked the public whether it should turn a gap in the rules into a clear offence. Under the proposal, any road vehicle in Great Britain first used on or after 1 January 2001 would have to keep its emissions control systems in working order, so that it continues to meet the limits it was built to meet. Using a vehicle that no longer does, or changing it so that it no longer does, would be prohibited. Prosecution in a magistrates’ court would carry fines the consultation puts at “between £1000 and an unlimited amount”.

None of this is law today. The consultation, titled Regulating environmental impact of in-use emissions of road vehicles, opened on 6 July 2026 and closed at 11:59pm on 6 September 2026. The department says it expects new legislation to be passed in the summer of 2027, and it proposes a six month lead in after that, which would give garages and owners time to service or repair systems before enforcement starts. Until regulations are made, the rules that apply are the ones already on the statute book.

What follows sets out what the document proposes, who it would reach, what the figures behind it show and what owners can sensibly do now. Every figure comes from the consultation page or from legislation we opened on legislation.gov.uk.

What the Rule Says Today and What Would Change

The proposal rewrites regulation 61A of the Road Vehicles (Construction and Use) Regulations 1986. That regulation already applies to motor vehicles first used on or after 1 January 2001. It was inserted with effect from that date, and the amendments listed on the official text date from 2001 to 2006. It points back to the emission limits set by the directives named in its table, and it restricts using a vehicle on a road that fails those limits unless certain conditions are met. Those conditions include that the failure does not result from changes to the engine or exhaust, that routine servicing would not put it right, and that any emission control device is working properly. A vehicle can also be driven to a place where a faulty device will be repaired or replaced.

That wording is the gap the department describes. The consultation says regulation 61A was not updated for the later Euro standards, and the existing carve out for failures that follow engine or exhaust changes sits awkwardly with an offence aimed at tampering. The new text would lean on sections 42, 75 and 76 of the Road Traffic Act 1988. Section 42 makes it an offence to contravene a construction and use requirement, or to use, cause or permit the use of a vehicle that does not comply with one.

The new rule would prohibit using or allowing the use of a vehicle that no longer meets its approved emissions standards through poor maintenance or modification, and it would prohibit modifying a vehicle in a way that breaches those standards. The department says it does not plan to distinguish between poor maintenance and modification, or between deliberate and unintentional changes. A car with a fault left unrepaired would sit in the same legal position as one that was deliberately altered, unless an exemption applies.

Four kinds of change are named as unlawful in every case:

• removal of diesel particulate filters (DPF) or gasoline particulate filters (GPF);
• removal of three way catalytic converters, often alongside sensor changes or ECU remapping;
• manipulation of selective catalytic reduction systems and diesel exhaust fluid, known as an AdBlue delete;
• manipulation of exhaust gas recirculation (EGR) systems, either physically or through ECU remapping.

Parts that are not made by the original manufacturer are not banned. The consultation says generic parts can be fitted, but fitting unsuitable or illegal parts is already an offence.

Who Would Be Hit and What the Fine Could Be

The proposal would reach every owner or user of a vehicle first used from 2001 onwards, which covers a large share of the cars and vans on British roads today. The wording targets using a vehicle and allowing it to be used, so it is not limited to the person at the wheel. It would also reach further than cars and vans. Regulation 61A currently covers category M and N vehicles, meaning cars, vans, lorries, buses and coaches. The consultation proposes extending it to category L vehicles, which are mopeds, scooters, motorcycles, tricycles and quadricycles, and it asks which categories should be included.

The consultation asks about exemptions rather than promising them. Those under discussion are faults outside the owner’s or user’s control in defined circumstances, vehicles brought temporarily into Great Britain by overseas residents for up to six months in twelve, vehicles driven to have an emission control device repaired, vehicles driven to a port for export and vehicles used off road. It also leaves an open question for other circumstances.

On penalties, the consultation says breaches of the sections it cites can lead to fines “between £1000 and an unlimited amount” after prosecution in the magistrates’ court. It does not set a separate penalty for a filter, a catalytic converter, an AdBlue system or an EGR valve, and it does not mention penalty points. It does not say how the proposal would affect an MOT result either. Anyone reading the document in search of a tariff will not find one.

Enforcement would fall to the Driver and Vehicle Standards Agency. The consultation expects that work to concentrate on the illegal modification trade rather than on individual drivers at the roadside. Some emissions checks can already be made at annual roadworthiness tests, but the document describes that scope as limited.

The Numbers Behind the Proposal

The department’s case rests on emissions testing and health costs. A roadside remote sensing study of more than 94,000 vehicles found that fewer than one in 10 passenger cars met the official limits for nitrogen oxides, according to the consultation. About two thirds of Euro 5 and Euro 6 diesel cars emitted more than three times the permitted level. Those are the findings the department cites, and the page does not break them down by make, age or cause. It does not say whether any of the cars failed after a filter or catalytic converter had been removed.

On health, the UK Health Security Agency estimates £9.4 billion in NHS and social care costs attributable to particulate matter and £9.2 billion from nitrogen dioxide between 2017 and 2035. The consultation adds that reaching the World Health Organization guideline of 10 micrograms per cubic metre for particulate matter would give about 40,000 additional productive life years, valued at around £1 billion.

The scale of tampering is the weakest number in the document. The DVSA’s market surveillance unit received 331 intelligence reports about emissions modifications in 2024, and the government believes that is only a small share of the activity. The consultation gives no estimate of how many vehicles have been modified. Nobody can say from this document how many drivers the new offence would catch, and that is the figure the case for it is missing.

What Owners Should Do Now

Nothing changes in law today, so the practical steps are about checking and keeping records. Look through the service history for any work on the particulate filter, catalytic converter, AdBlue system or EGR valve, and keep the invoices from the garage that did it. If you bought a used diesel, ask the seller for that paperwork. Under the proposal, a vehicle that no longer meets its approved standards would be in breach however it got there, so a clean paper trail is the best evidence that nothing was removed on your watch.

If a warning light is on, get the fault diagnosed and repaired rather than leaving it. Under the proposal an unrepaired fault would sit in the same legal position as a deliberate change. Our guides to what a flashing engine management light means and what a flashing glow plug light means explain the usual causes.

Treat any offer to remove an emissions system as a legal risk. The consultation lists these changes as unlawful in every case, and the department says it intends to target the trade that carries them out. Fitting a generic replacement part is not banned, but the part has to be suitable for the vehicle.

The outcome of the consultation and any draft regulations are the points at which the rules can change. The department has said legislation is expected in the summer of 2027, with a six month lead in proposed, so the earliest the new offence could apply is some time after that. Until then, current rules apply, and this article will not be the last word once the department publishes its response.

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Sources:

• GOV.UK: Regulating environmental impact of in-use emissions of road vehicles
• legislation.gov.uk: Road Vehicles (Construction and Use) Regulations 1986, regulation 61A
• legislation.gov.uk: Road Traffic Act 1988, section 42, Breach of other construction and use requirements