Should I remove the DPF from my Mazda 5?

The DPF light is showing on my 2008 Mazda 5 diesel. Some say it is the better option (and legal) is to remove the filter altogether. Any suggestions?

Asked on 23 November 2013 by KR, Enfield

Answered by Honest John
Not legal: “It is an offence under the Road vehicles (Construction and Use) Regulations (Regulation 61a(3)) to use a vehicle which has been modified in such a way that it no longer complies with the air pollutant emissions standards it was designed to meet. Removal of a DPF will almost invariably contravene these requirements, making the vehicle illegal for road use. A vehicle might still pass the MoT visible smoke emissions test, which is primarily intended to identify vehicles that are in a very poor state of repair, whilst emitting illegal and harmful levels of fine exhaust particulate.” See:

Because removal of a DPF is already illegal, VOSA enforcement could happen overnight without warning, though I doubt that it will. Happily, there is a new service that can clean DPFs, giving them greatly extended lives at:
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