It all comes down to "how will the tester know that the dpf has been removed?"

You can remove the whole case and replace with a straight through pipe, or on some, take the filter off, whack a large masonry bit through the matrix and de-programme the ecu.

Stick the lot back on and who's the wiser?

The ironic part is, I have a DPF on my van and it costs me more in road tax than a previous model without it, due to the DVLA's banding system of not recognising Euro 4 or 5 between 2006 and 2009.

Soo much for lower polution equalling cheaper VED rates.

Since we went over to diesel cars we've never had an MOT failure on emissions. When we had petrol cars emissions was one of the main failure points on our cars.

QUOTE:...""I suspect cleverly done, ie by welding extra metal inside the canister to give it a more solid feel/sound when tapped, that a well done de-DPF would fool most MOT testers, whether the tester would be in the least bothered about searching for empty DPF pods anyway i'm unsure.""

Ah, but tampering with the DPF would probably affect the particlate emissions, so you'd be no better off.

Edited by Sofa Spud on 23/06/2014 at 22:48

Just had mine done at the dealership and it passed. Why?
Because it is still there but the filter medium was removed.
It doesn't smoke at all anyway due to Bluemotion Euro 5.

Presumably they will remove them in such a way that they can't detect that they have done it ;)

They don't actually have a means to test the DPF, They only look for it physically.

So provided it 'appears' to be fitted and can pass the smoke test, It will pass the MOT.

Ironically my car that was never fitted with a DPF has a lower VED rate than my car fitted with a DPF.

Ironically my car that was never fitted with a DPF has a lower VED rate than my car fitted with a DPF.

VED is based on the CO2 figure. A DPF removes particles, it has nothing whatsoever to do with CO2. Thus having a DPF will not reduce your VED.

Yes, The one fitted with a DPF has lower CO2 but, As it is classed as an LCV and was registered between december 2006 and january 2009 I get charged for a Non Euro compliant engine. Even though it is at least Euro 4.