DPF (Diesel Particulate Filter) is a device designed to remove diesel particles or soot from the exhaust gas of a diesel engine. It basically traps the diesel particles in the filter and at a given condition the ECU will put it into regeneration mode when these particles are burnt and blown out of the exhaust. Unfortunately these filters get blocked by constant urban cycles which may cause running problems. The engine will enter in “limp mode” and the warning MIL will be displayed on the dash panel.
TYPICAL DPF WARNING LIGHTS & MESSAGES
LATEST NEWS AND LEGAL IMPLICATIONS ON DPF REMOVAL.
Before the Latest Government announcement (9/12/13 ) There was the option to have the DPF filter removed. This service can no longer be offered due to current legal issues.
Removal is not a legal option
It is suggested from time to time that the answer to a failed DPF regeneration is get the DPF removed from the exhaust system rather than pay to get it repaired/renewed. Indeed there are companies advertising just such a service including reprogramming of the engine management software, but is it legal?
DPFs are fitted to meet European emissions regulations designed to reduce vehicle emissions of particulate matter (soot) associated with respiratory disease and cancer.
According to the Department for Transport, 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.
Also from Feb 2014 , The DPF filter is Part of the current MOT / VOSA annual test.
Legal requirements and the MoT test
From February 2014 the inspection of the exhaust system carried out during the
MoT test will include a check for the presence of a DPF. A missing DPF, where one
was fitted when the vehicle was built, will result in an MoT failure.
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.