13 replies to this topic

[sledgehammer]

Am I reading this right ???

 

a lot of people are having problems with DPF's blocking up

 

http://www.motester....val-and-the-mot

 

a DPF isn't required to pass the test - as long as the exhaust emissions are within limits ???

[nicklouse]

Am I reading this right ???
 
a lot of people are having problems with DPF's blocking up
 
http://www.motester....val-and-the-mot
 
a DPF isn't required to pass the test - as long as the exhaust emissions are within limits ???

If originally a DPF is required to be seen fitted. Same as a CAT. if they were there originally they mudt pass a visual check.

This is for both Diesel and Petrol engines. But no dpf on a petrol of cause.

https://www.gov.uk/g...ticulate-filter

Edited by nicklouse, 12 January 2015 - 05:33 PM.

[Carlos W]

My car has nothing inside the dpf, the innards were smashed out. When the dpf was programmed out the dpf light comes on with all the other dash lights but then goes off.

I had no problem with the mot.

[MiniJosh92]

To quote from the MOT testers guide, "Reason for rejection - A catalytic converter or particulate filter missing where one was fitted as standard", updated Feb 2014.

[SiZT]

 

Am I reading this right ???
 
a lot of people are having problems with DPF's blocking up
 
http://www.motester....val-and-the-mot
 
a DPF isn't required to pass the test - as long as the exhaust emissions are within limits ???

If originally a DPF is required to be seen fitted. Same as a CAT. if they were there originally they mudt pass a visual check.

This is for both Diesel and Petrol engines. But no dpf on a petrol of cause.

https://www.gov.uk/g...ticulate-filter

 

 

This

 

My car has nothing inside the dpf, the innards were smashed out. When the dpf was programmed out the dpf light comes on with all the other dash lights but then goes off.

I had no problem with the mot.

 

So you need to do the above if you want rid of the dpf, it depends on how many miles you do and the types of journey

[Carlos W]

You cannot visually tell mine hasn't got a DPF, no cutting and welding.

[grumpy2]

looked into this with my dodgy old diesel

 

yes, if you remove the DPF entirely it SHOULD fail an MOT. If you remove the innards of the DPF and refit the carcase then unless the tester can tell it has no innards it may well pass an MOT if the ecu has been programmed to extinguish the warning light.

 

However if there are any subsequent engine management related issues then you have minimal chance of the diagnostic software accurately pinpointing the problem.

 

spawn of satan!

[Chance]

In that case, if i smash the innards out of my CAT, or buy one of those decat pipes that looks like a CAT will it pass an MOT if the emissions are OK?

[Tanya]

My car has nothing inside the dpf, the innards were smashed out. When the dpf was programmed out the dpf light comes on with all the other dash lights but then goes off.

I had no problem with the mot.

 

+1 for me with this.  

[SiZT]

looked into this with my dodgy old diesel

 

yes, if you remove the DPF entirely it SHOULD fail an MOT. If you remove the innards of the DPF and refit the carcase then unless the tester can tell it has no innards it may well pass an MOT if the ecu has been programmed to extinguish the warning light.

 

However if there are any subsequent engine management related issues then you have minimal chance of the diagnostic software accurately pinpointing the problem.

 

spawn of satan!

 

Depends who's coded the light out and whether they've deleted all of the eml code or just those relating to the dpf

 

In that case, if i smash the innards out of my CAT, or buy one of those decat pipes that looks like a CAT will it pass an MOT if the emissions are OK?

 

Yes, but the chances of it passing are minimal unless it's had a lot of time spent refining the idle and light load 2,500 - 3,000 rpm areas of the map

[Carlos W]

Since I had my dpf removed and car re-mapped its quicker and more efficient. Its not at all smokey, I've asked people who've been following me

[grumpy2]

In that case, if i smash the innards out of my CAT, or buy one of those decat pipes that looks like a CAT will it pass an MOT if the emissions are OK?

Unlikely with what you have said.

A decat or DPF bypass pipe would be spotted easily, removing the DPF in nerds would not be so easy to spot but the tell tale light on the dashboard would be an automatic fail, oh and the light not illuminating with the ignition switched on should also be a fail.

It can be done and several companies offer a 'full service DPF removal' for about £300

I ended up having mine removed, ultra sonically and chemically cleaned and refitted. Only time will tell if this is a long term solution

[Mini 360]

Remap your car after you get it deleted.  Make sure they take into account the DPF delete and it will cause no issues, give you more power and torque and in some instances, better fuel economy.  Been doing a lot of research into doing all this to my future purchase MK4 Golf Anniversary GTI.

 

A lot of DPFs are hidden under engine covers.  Cant remove covers in an MOT test so you will be fine.  But to be honest as long as the emissions is fine, they won't fail you for it.  If they do, go to another MOT tester....

Edited by Mini 360, 12 January 2015 - 07:31 PM.

[cambiker71]

Dpf tell tale light is not an MOT fail, some dpf lights are on because it's due a regen but will still pass the emissions limits anyway. The lamp is not a testable item.
Who can tell if the innards are missing or if it's due a regen under MOT test conditions? Nobody, is the answer!