300tdi Will it fail mot if cat is removed

discool · Feb 23, 2012

Modern car engines use a diesel particulate filter to capture carbon particles and then intermittently burn them using extra fuel injected directly into the filter.

Does a disco tdi have all that?

A day will come when just smoke tests are not enough and emissions CO HC etc will be checked.

Dr_evil · Feb 23, 2012

discool said:
Modern car engines use a diesel particulate filter to capture carbon particles and then intermittently burn them using extra fuel injected directly into the filter.

Does a disco tdi have all that?

I highly doubt it……..

Either way mines just got a piece of flexi so like I care

Jongould · Feb 23, 2012

discool said:
Modern car engines use a diesel particulate filter to capture carbon particles and then intermittently burn them using extra fuel injected directly into the filter.

Does a disco tdi have all that?

A day will come when just smoke tests are not enough and emissions CO HC etc will be checked.

The original cats are just that, catalysts. They heat up to a very high temperature and burn off unburnt fuel, this is what the TDi's have, modern DPFs are as you have described although alot use an additive and not extra fuel.

Smoke tests are already a bit redundent, modern diesels dont even register on the smoke meter....

geb · Feb 23, 2012

I think most of its going to come down to the interpretation of the MOT tester on the day. How does he know what was fitted to every vehicle as standerd, especially as some models had cats and some don't.

Jongould · Feb 23, 2012

geb said:
I think most of its going to come down to the interpretation of the MOT tester on the day. How does he know what was fitted to every vehicle as standerd, especially as some models had cats and some don't.

No its not, its a clear cut case of if it passes a smoke test then its a pass, there is no tester discretion on this, the rules are set 100%

shocker · Feb 23, 2012

The way it was explained to me was if the vehicle had it as original equipment then it must be there . But how would the test station know ? Surely the info available to them will be of standard model type , not specific vehicle , so one would say that it came that way , i.e , straight pipe ...????

This is disregarding the smoke test issue , please note , that has been explained and I quite understand now .....ish....a bit....some

Jongould · Feb 23, 2012

shocker said:
The way it was explained to me was if the vehicle had it as original equipment then it must be there . But how would the test station know ? Surely the info available to them will be of standard model type , not specific vehicle , so one would say that it came that way , i.e , straight pipe ...????

This is disregarding the smoke test issue , please note , that has been explained and I quite understand now .....ish....a bit....some

Nope, its a case of if it passes thats it, doesnt matter if it had one or not, looking for a cat doesnt come into the test in any way.

discool · Feb 23, 2012

geb said:
I think most of its going to come down to the interpretation of the MOT tester on the day. How does he know what was fitted to every vehicle as standerd, especially as some models had cats and some don't.

Model year specification I would think displayed on their screen, ie. UK market 1993MY Discovery V8 and MPI models onwards exhaust catalyst standard fitment.

Whether a Tdi has a catalyst or not is of no importance.

Jongould · Feb 23, 2012

discool said:
Model year specification I would think displayed on their screen, ie. UK market 1993MY Discovery V8 and MPI models onwards exhaust catalyst standard fitment.

Whether a Tdi has a catalyst or not is of no importance.

For petrols its a case of dates, no information regarding whats fitted is displayed, you just select year of registration and again its if it meets emissions standards it doesnt matter if a cat is fitted or not (but a non catted vehicle wont hit the 0.3 CO% or get the lambda within 0.97-1.03 which is needed for the post 93 vehicles).

discool · Feb 23, 2012

Cats now have to be fitted at the time of the test for petrol engines, if they were fitted as standard equipment to that vehicle. New rules for 2012.

But then the tester will need so indication of the vehicle spec as they may have an imported vehicle to test which will not have cats fitted but will still pass the emmisions test.

Jongould · Feb 23, 2012

discool said:
Cats now have to be fitted at the time of the test for petrol engines, if they were fitted as standard equipment to that vehicle. New rules for 2012.

But then the tester will need so indication of the vehicle spec as they may have an imported vehicle to test which will not have cats fitted but will still pass the emmisions test.

Thats one of those rulings that really isnt needed as a non cat'd petrol engine will never make the emissions standard. There is no way to see the spec of a vehicle at present so there is no way to tell, I know they are looking to redo the MOTcomp system so who knows what will be on the new system...

300tdi Will it fail mot if cat is removed

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