MOT without catalytic converter in diesels (1 Viewer)

PJGWiltshire

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Just got back from having the MOT carried out. Passed no problem even though I had removed the catalytic converter. The guy noticed that I had removed it and clearly was aware that there have been some dispute over this subject with diesel vehicles. It appears that he got into a bit of a dispute with some commercial Ducato owners who like MH owners had been victims of thefts and replaced the Cat with exhaust tubing. Having failed a vehicle the appeal was followed up and the appeal team fully informed the test centre that as emissions are not checked there is no requirement for diesels to have a Cat only petrol vehicles.
Well any case the MOT centre were no problem

Good luck to others :Smile:but be prepared to stand your ground

In any case if anybody wants the MOT centre details drop me a line they are next to Southend airport
 
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Geo

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The confusion is easy to understand

The tester who only reads in the manual what he thinks he needs will get it wrong

Section 7.1 item 3 reason for rejection A Catalytic Converter missing where one was fitted as standard
Results in an Incorrect Fail

Completely ignoring Note 3 will be the cause of this error

Note 3 to be read in conjunction with reason for rejection 3

On vehicles that qualify for a full Cat emissions test
Check for presence of a Catalytic Converter

Clearly this cant apply to diesels as they only need a smoke/visibility test even though that is done via an emissions testing device

So if your tester gets it wrong, offer ever so politely to show him in the manual where he went wong:Eeek:
IF YA DARE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!:ROFLMAO:
 

Techno

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For information and Geo will be well aware of this. As of Feb 2014 the above no longer applies and the missing cat will be a fail if it was fitted at time of manufacture.

*note previous post was April 2013

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Tootles

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For information and Geo will be well aware of this. As of Feb 2014 the above no longer applies and the missing cat will be a fail if it was fitted at time of manufacture.

*note previous post was April 2013
Interesting. So how would they know if one was fitted at manufacture?? My BMW K1100 hasn't got a CAT, but the same model built two months later has. My Ducato hasn't got one, but some of the 2.5 turbo's have.
 

Techno

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I imagine it would be "relatively" easy to encourage a piece of appropriately sized pipe through the middle of a X250 cat :whistle:
765332.gif

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Tootles

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Vin number
Right. So then the auto stats thing concerning a vehicle's VIN number, would automatically tell the tester that a CAT was fitted?? And likewise, refuse to allow the test to continue if the CAT was missing. Like, the machine would refuse to take a sample, or would it just be down to the fitter to be observant?
 

Techno

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Nothing to do with emissions "visual inspection for the presence of"
An appropriate tool (must not cause damage) may also be applied to ascertain it is not an empty CAT like hollow.
Test would continue but fail.
 

Techno

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Naturally the usual ploy to avoid is to refit a cat for the test.

EDIT 3 bolts 1 clamp 2 rubber hangers, new gasket.

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Tootles

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So in truth, you could replace the cat with pipe, weld a box stuffed with brillo pads over the section, stick the sensors into it, and you pass.
 

Techno

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So in truth, you could replace the cat with pipe, weld a box stuffed with brillo pads over the section, stick the sensors into it, and you pass.
No need, the Lambda sensor is in the pre Cat straight after the exhaust manifold. The main Cat is a free entity.
As for theft that is not a concern given how my van is used and stored.
The point is not to prevent theft but to unbridle the engine so it performs as it really should. A Cat on a diesel makes no difference to emissions.

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Tootles

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No need, the Lambda sensor is in the pre Cat straight after the exhaust manifold. The main Cat is a free entity.
As for theft that is not a concern given how my van is used and stored.
The point is not to prevent theft but to unbridle the engine so it perfoms as it really should. A Cat on a diesel makes no difference to emissions.
Puzzled. So why the need for one??
 

GWAYGWAY

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So in truth, you could replace the cat with pipe, weld a box stuffed with brillo pads over the section, stick the sensors into it, and you pass.
Isn't that exactly what a particulate filter is the same as required by LEZ for £2300 +VAT from approved companies.
 

Techno

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Isn't that exactly what a particulate filter is the same as required by LEZ for £2300 +VAT from approved companies.
Particulate filter is much harder to overcome in presence and engine management. A good advert for buying older vehicles.
 

Techno

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When the time comes for a new exhaust I'll have a private word with a custom builder to sort my requiremnts

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pappajohn

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Nothing to do with emissions "visual inspection for the presence of"
An appropriate tool (must not cause damage) may also be applied to ascertain it is not an empty CAT like hollow.
Test would continue but fail.
As in my last post Andy....the only requirement is the presence.
No other check is carried out for the MOT and the tester cannot remove or dismantle any part of the vehicle during the mot which he would need to do to insert a probe into the cat .

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PJGWiltshire

PJGWiltshire

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Noted that this post has come back up and reading through the past history I note I started this in April 2013 when the MH passed the MOT with the Cat removed, A follow up post stated 'that from Feb 2014 if a cat was originally on the vehicle and now was not it was a fail,. In April 2014 went for MOT as the norm and sailed through, (had forgotten about the comment mentioned),perhaps the tester back then didn't know about the rule changes. Has anybody out there post Feb 2014 been failed for removing the Cat.
 

Techno

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As in my last post Andy....the only requirement is the presence.
No other check is carried out for the MOT and the tester cannot remove or dismantle any part of the vehicle during the mot which he would need to do to insert a probe into the cat .
I believed they are allowed to tap on it? as it will sound very different with guts removed. Is this not the case?

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PJGWiltshire

PJGWiltshire

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Well all they will see is a straight bit of pipe going to the silencer, looks like I will have to clip the Cat back on for the morning in April to save any hassle
 
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PJGWiltshire

PJGWiltshire

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Thats the one ~I just looked up, So just have to allow a bit of time on the day,

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Jean-luc

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The Cat on my S40 1.9D failed last year as did both on my brother-in-laws Merc 2,2 cdi previously.
Subject to owners approval the garage we use will take down the faulty Cat, opens it where the cut won't be seen, removes the offending innards, welds it closed again and refits it.
They assured us that the job a Cat does is not checked during roadworthiness testing (MOT as you guys know it in the UK) and the 'empty' one will pass the visual inspection.
Both vehicles have gone through the test procedure without issue, mine once and the brother-in-laws three times since removal
 
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Hi.
It would appear i am shareing my,"Road space",with................ SINNERS !!!
Tea Bag.
PS. Now where's my 2lb lump hammer and drift ?
 

GJH

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We had our mechanical service and MoT just under a fortnight ago. Our mechanic found that the front pipe of the exhaust has a small hole just at the rear flange end, put some cement on it and it passed its test but my next job was to get it booked in for a new front pipe.
The local Fiat commercial place told us there are two or three different exhaust patterns (2003 2.8JTD engine) so we had to take it up there first to check which one was needed. To our relief it was the cheaper one. The one with integral Cat is over £1000 :Eeek:

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