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DPF Tampering and the MOT  Rate Topic 
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 Posted: Mon Jan 28th, 2019 01:48 pm
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Paul S
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Mana: 
further 2. If a diesel particulate filter has clearly been cut open and rewelded,we fail it unless the vehicle presenter can show evidence that there was a valid reason to cut it open, such as for filter cleaning.

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 Posted: Mon Jan 28th, 2019 12:03 pm
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KevG
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If there is a wrap around the DPF as you state in the question, we would not be allowed to remove that to investigate further. If so I would advise on the pass/fail certificate that I was unable to inspect the DPF for tampering.

Last edited on Mon Jan 28th, 2019 01:36 pm by KevG

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 Posted: Mon Jan 28th, 2019 11:50 am
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Ingenieur
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Thank you for your input.

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 Posted: Mon Jan 28th, 2019 11:38 am
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castrolrob
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in practice on many vehicles its difficult(or in some cases impossible)to ascertain the presence(or otherwise) of dpfs/cats due to some vehicle constructions/visibility issues.add this to the fact that many of the headline pollutants aren't tested during an mot and it leads to a large amount of cynicism on the subject from both trade and public

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 Posted: Mon Jan 28th, 2019 11:32 am
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bimmer
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OK. Good luck with your studies and welcome to the forum.:)

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 Posted: Mon Jan 28th, 2019 09:43 am
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Ingenieur
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No, Plymouth University.

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 Posted: Mon Jan 28th, 2019 09:42 am
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bimmer
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Hi Ingenieur

Would that be Swansea university by any chance.

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 Posted: Sun Jan 27th, 2019 11:04 am
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Ingenieur
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It's just for a university assignment. As stated I'm after testers opinions, the people who are in the field assessing vehicles :)

Last edited on Sun Jan 27th, 2019 11:05 am by Ingenieur

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 Posted: Sun Jan 27th, 2019 10:58 am
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KevG
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Hi. Who is the study for? You realise this is a Forum for MOT regulations It’s only relevant to the Road Traffic act and not Construction and use regs. You may be better off contacting DVSA if you need definitive answers.

Kev.

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 Posted: Sun Jan 27th, 2019 10:52 am
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Ingenieur
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Hi! I'm not actually in the MOT industry, I'm writing a case study on diesel vehicle emissions, and just getting some information.

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 Posted: Sun Jan 27th, 2019 10:45 am
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Stealth
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Hi Ingenieur & welcome to the Forum.

I guess you are in the MOT trade from your question.

Why not pop over to the Introduction section, have a quick read of our rules and tell us a bit about yourself.😀

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 Posted: Sun Jan 27th, 2019 06:12 am
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Ingenieur
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For the record I an not condoning DPF removal, I just want to get real people's opinions on the subject because it seems to have a lot of controversy.

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 Posted: Sun Jan 27th, 2019 06:11 am
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Ingenieur
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This is a question for all you MOT testers out there, I know this topic is subjective but I'd like to get an insight from people who deal with this on a daily basis. As of 2018 I'm under the impression that MOT rules changed to include a visual inspection of the particulate filter to check for tampering, non OEM welds, grind marks etc. My question is that what would YOU decide to do during a test encountering the following scenarios:

1. An aftermarket DPF was fitted, with a different design and sub par quality welds.

2. The original DPF had obviously been cut open and welded back shut, but this actually was for cleaning reasons.

3. The car was modified and the DPF and exhaust system had been wrapped in an aftermarket exhaust heat wrap product, obscuring the DPF.

All of these options are based on visual inspection alone and are assuming the vehicle passed the smoke test and did not have any warning lights on. I'd like to know your opinions and if you would pass or fail the vehicle. Thanks.

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