{"id":26781,"date":"2026-07-19T17:39:10","date_gmt":"2026-07-19T16:39:10","guid":{"rendered":"https:\/\/www.cathive.co.uk\/advice\/type-approval-and-the-law\/"},"modified":"2026-10-01T19:33:44","modified_gmt":"2026-10-01T18:33:44","slug":"type-approval-and-the-law","status":"publish","type":"page","link":"https:\/\/www.cathive.co.uk\/nl\/advice\/type-approval-and-the-law\/","title":{"rendered":"Typegoedgekeurde katalysatoren en roetfilters: wat zegt de wet?"},"content":{"rendered":"

Replacement catalytic converters and DPFs are legally controlled parts in the UK. If your vehicle was first registered on or after 1 March 2001, a replacement catalytic converter must be type approved for it, and if it is Euro 5 or later, so must a replacement DPF1<\/sup>. This guide explains what type approval means, which vehicles the law covers and how to tell whether a part qualifies.<\/p>\n

What type approval means<\/h2>\n

Type approval is certification by a government approval authority that a replacement part meets the legal standard for the vehicles it is approved for. In the UK that authority is the Vehicle Certification Agency (VCA)2<\/sup>. For a replacement catalytic converter or DPF, the approval tests compare its emissions with the original part on the same vehicle, and cover its durability and its compatibility with the vehicle’s on-board diagnostics3<\/sup>.<\/p>\n

An approval covers a list of specific vehicles, with their years of manufacture3<\/sup>. That matters more than people expect: parts for different vehicles, approved to different Euro levels, can share the same housing and pipework yet differ inside, in their approval and in how they perform. A part that can be made to fit is not necessarily approved, or legal, for your vehicle and its Euro level4<\/sup>.<\/p>\n

What the law requires<\/h2>\n