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Diesel Particulate Filter - New MOT Regulations #854273
28th Jan 2014 10:50pm
28th Jan 2014 10:50pm
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Mally Offline OP
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Just a heads up guys:

Tests for diesel cars and lorries are to be tightened up to ensure vehicles have a critical exhaust filter if one had originally been fitted as standard, Roads Minister Robert Goodwill has announced.

Garages and testing stations will be required check for a diesel particulate filter (DPF) in the inspection of the exhaust system as part of the MOT test (or annual test for heavy vehicles) from February 2014.

The vehicle will automatically fail the MOT test if the filter had been fitted as standard but is found to be no longer present.

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Re: Diesel Particulate Filter - New MOT Regulations [Re: Mally] #854274
28th Jan 2014 10:52pm
28th Jan 2014 10:52pm
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Excuse my ignorance, but why would someone remove the filter?. Cheers


One Way Or Another
Re: Diesel Particulate Filter - New MOT Regulations [Re: Mally] #854276
28th Jan 2014 11:04pm
28th Jan 2014 11:04pm
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Mally Offline OP
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absolutely no idea. Good Health

Re: Diesel Particulate Filter - New MOT Regulations [Re: Mally] #854283
28th Jan 2014 11:33pm
28th Jan 2014 11:33pm
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Maybe it slowed the engine down,, muffled?


One Way Or Another
Re: Diesel Particulate Filter - New MOT Regulations [Re: Mally] #854285
28th Jan 2014 11:37pm
28th Jan 2014 11:37pm
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Old news this. Basically all the new small diesels with low to zero road tax that all the Eco warriors buy have a filter in the exhaust system that if you don't do a decent high revs prolonged drive about once a month clogs up and causes all manners of hell, easy solution, chop it out, some garages may have done this and owners may be non the wiser as the 'running problem' will have been fixed, now you'll have to pay to have the system reinstated or fail. Europe screwing us again trying to force old vehicles off the road. Just buy a old diesel, no ecu, decat & straight through exhaust (one silencer box of minimal restriction purely for mot purposes) and run it on veg / veg mix / bio / or if your flush diesel lol.

Re: Diesel Particulate Filter - New MOT Regulations [Re: Dodgy_Bob] #854287
28th Jan 2014 11:56pm
28th Jan 2014 11:56pm
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venice Offline

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And a right pain they are too . I do a lot of to-ing and fro-ing fairly short distances on low speed roads . Today I actually had to make a point of going via the motorway in a roundabout route to Chester on a fairly unecessary trip , just to satisfy the needs of the p.filter. Very green!

Re: Diesel Particulate Filter - New MOT Regulations [Re: Mally] #854327
29th Jan 2014 10:20am
29th Jan 2014 10:20am
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keving Offline
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yeah people remove them as they get better MPG and better performance, plus don't have to have the worry of them blocking.
Its not just small cars that have them, according to theAA almost all diesels after 2009 required them to meet the tough exhaust EU requirements.

I kow many people have the box cut open and all the inners, removed then welded back up. I wonder if the MOT tester will be able to pick up on this type of mod. A welded box won't be that obvious once its covered in road crap.

Re: Diesel Particulate Filter - New MOT Regulations [Re: Mally] #854363
29th Jan 2014 12:46pm
29th Jan 2014 12:46pm
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Oxton
Gibbo Offline
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It doesn't just affect "small diesels", larger cars also have them in.

If the car is properly maintained then a DPF shouldn't be a problem, the car will regenerate regardless of what road its been driven on.

The thing is these need replacing around the 80k mark and can cost anywhere from 100 to 500, depending on car and where you buy from.

And this is what people bitch about. If they read up on filters before buying their car, or just factored in the cost then it shouldn't make any difference.

On a Pug 307 a new filter and a top up of the additive can be done for 200. That will then last another 70,000 - 80,000 miles - that's a third of a penny per mile.


Re: Diesel Particulate Filter - New MOT Regulations [Re: Gibbo] #854374
29th Jan 2014 1:45pm
29th Jan 2014 1:45pm
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Quote Gibbo "If the car is properly maintained then a DPF shouldn't be a problem, the car will regenerate regardless of what road its been driven on.

I dont believe that its down to maintenance . This is what the AA have to say.

" Even if your driving isn't mainly urban/stop-start, changes to driving style may be required to keep these systems working properly.
If you're buying a new car and plan to use it mainly for town-based, stop/start driving it would be wise to avoid a diesel car fitted with a Diesel Particulate Filter (DPF) because of the possible hassle of incomplete 'DPF regeneration!"

AND p filters can cost 1000 + so Im not taking the risk!
Not too keen on getting it removed either , as it invalidates the insurance .


Last edited by venice; 29th Jan 2014 1:47pm.
Re: Diesel Particulate Filter - New MOT Regulations [Re: Mally] #854390
29th Jan 2014 2:46pm
29th Jan 2014 2:46pm
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It all depends on the car, some Peugeots will regen happily on local roads and no high speed motoring is required, providing the additive tank is not left to go empty and the other components are maintained, such as glow plugs.

Some people and even mechanics think and say that glow plugs are never used and need never be replaced, which is why they're sometimes in hard to reach places in the engine bay. This is complete rubbish. Their entire reasoning is based on the fact the glow plug light doesn't come on unless its really cold.

They don't seem to know or understand or care about post-heating or the use of the plugs in a regen.

The trouble with the AA is they're pretty generic when it comes to vehicles.

Its certainly the case when they go out to a breakdown, stick on the code reader and just guess at what the fault might be based on the fault code.

They've misdiagnosed three of my customer's cars - told two that they needed two high pressure fuel pumps when they needed a fuel filter or a clean of the lift pump, and on another told him that his entire ABS system was faulty and needed a new ABS ECU when it was a faulty ABS sensor on one of the rear wheels.

As for DPF prices, have a look here:

http://www.cats2u.co.uk/

Much cheaper than the dealers, and no less quality as they sell OEM and type approved.



Re: Diesel Particulate Filter - New MOT Regulations [Re: Gibbo] #854430
29th Jan 2014 5:09pm
29th Jan 2014 5:09pm
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Hi Gibbo Thanks for that link, will put it to one side just in case.
Do all cars with the p.filters have a top up tank? The 2012 Skoda Octavia 2.00 TDI 139hp manual makes no mention of it and mechanic says 'heat and revs,nothing else' . Have we got one weve not been told about by any horrible chance?

Re: Diesel Particulate Filter - New MOT Regulations [Re: Gibbo] #854444
29th Jan 2014 6:08pm
29th Jan 2014 6:08pm
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Originally Posted by Gibbo
If they read up on filters before buying their car, or just factored in the cost then it shouldn't make any difference.


A bit hard if like me, you don't know they exist in the first place.


One Way Or Another
Re: Diesel Particulate Filter - New MOT Regulations [Re: Mally] #854463
29th Jan 2014 6:45pm
29th Jan 2014 6:45pm
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They are a pain in arse. The one in my Passat recently started getting clogged and it would not clear automatically or by driving it at 2400 rpm till the light goes off as vw state. I ended up getting the garage to do a forced regeneration on it. This was despite the fact that the car makes reasonablely long motorway journeys most days of the week so theoretically it should not get blocked.

Re: Diesel Particulate Filter - New MOT Regulations [Re: venice] #854584
30th Jan 2014 8:54am
30th Jan 2014 8:54am
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Oxton
Gibbo Offline
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Originally Posted by venice
Do all cars with the p.filters have a top up tank? The 2012 Skoda Octavia 2.00 TDI 139hp manual makes no mention of it and mechanic says 'heat and revs,nothing else' . Have we got one weve not been told about by any horrible chance?


No, not all cars have them. Vauxhalls don't. Peugeot and Citroen definitely do. I've heard that the Focus does, but that wouldn't surprise me as they share the same engine.


There's some interesting info here:

http://c4owners.org/plugins/faq/faq.php?0.cat.10.44

And here:

[Linked Image]

[Linked Image]

Re: Diesel Particulate Filter - New MOT Regulations [Re: KevinFinity] #854585
30th Jan 2014 8:57am
30th Jan 2014 8:57am
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Gibbo Offline
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Originally Posted by KevinFinity
They are a pain in arse. The one in my Passat recently started getting clogged and it would not clear automatically or by driving it at 2400 rpm till the light goes off as vw state. I ended up getting the garage to do a forced regeneration on it. This was despite the fact that the car makes reasonablely long motorway journeys most days of the week so theoretically it should not get blocked.


Was this a one off or does it still happen? I can't speak for the VW but Pugs rely on several components working properly to do a regen - the glow plugs, glow plug relay, differential pressure sensor, additive tank level sensor, fuel cap sensor, cooling fan and cooling fan relays (phew!). If just one of those isn't working, it won't regen.

I was browsing the honestjohn forum the other day and someone mentioned that the DPF sensor is an issue on some VAG vehicles.

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