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Regulations on CATs

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  • Regulations on CATs

    Can someone post the wording on the MOT regulations that means us 1995 S2 owners can get away with having no CATS fitted?
    S2,RS2,S4 WB,RS4,S4 B8,RS6 C5,RS6 C6,R8

  • #2
    Doug

    This is taken from an independet site with info on MOTs:

    *************************************

    CAT test is an unfortunate term which leads many to think that the MOT is testing the Catalytic converter fitted to later vehicles but this is not so.

    The MOT is testing emissions, so if the emissions from the tailpipe meet the requirements the vehicle passes. Whether a CAT is fitted is irrelevant. The deciding factor is the vehicles date of first registration. A "Cat" may be fitted to a vehicle which only needs to meet the two gas test and if the emissions are satisfactory, it passes. A "Cat" may have been removed and the vehicle is required to meet the "Cat" test standard by virtue of its first registration date. If the emissions meet the standard then it passes.

    Many advanced design engines will meet the "Cat" requirements with a standard exhaust but of course may be emitting other pollutants not subject to the MOT.

    Advanced emission tests must be carried out on fully warmed up engines, the oil temperature must be above 80 degrees C (some are set at 60 degrees C) and the idle speed must be within the manufacturers agreed tolerances. Both engine speed and oil temperature will be measured using equipment attached to the gas analyser.

    During engine idle the engine must not be subject to electrical loading such as heated seats, heated rear windows and air conditioners. Electric cooling fans do not cause significant problems and can be active during the test.

    Twin exhaust systems need to have the reading from each pipe tested and then averaged. A twin exhaust has two separate pipes from the engine manifold all the way back to the tailpipes. Systems with a balance tube between separate pipes are still considered a dual exhaust.

    *********************************************

    It seems that a car has to pass the advanced emissions test but not actually have a CAT.

    I can't find any offical wording at the moment.

    HTH

    Leigh
    Ex 1994 Avant - now driving a Lotus 340r

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    • #3
      Found this aswell:

      I have a post '93 car, if I remove the cat would it still pass the MOT if the emissions are OK?
      There is nothing in the MOT regs to say a cat has to be in place but if the vehicle year/spec says it has to be tested to cat emission standards then it would be done using cat specs. If the car met those limits without a cat then yes it would pass.

      Leigh
      Ex 1994 Avant - now driving a Lotus 340r

      Comment

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