Catalitic converter,is it law?? - Page 2 - Renault Forums :: Independent Renault forum

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post #6 of 13 (permalink) Old 30th August 2009
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Well as far as I am aware, you do not need a catalyst, but you must be able to meet the emissions standards set with a catalyst, which are clearly near impossible to get on most cars without a catalyst. The 1992 law for catalysts within the EU may have been transposed and enacted in UK law based on emissions, but I do not know. More likely it was a manufacturer requirement and then backed up in operations by emission laws (i.e. Euro 3).

I think it does answer the question, if tested with your catalyst during a MOT and then removed, clearly the emissions will be higher and may breach the above regulation.

If tested without a catalyst and passes, then it probably won't breach the above regulation.

I don't think this is a well understood area.
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post #7 of 13 (permalink) Old 30th August 2009
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It isn't illegal to run a post 1992 car without a cat,but you will most probably need one to get through an MOT,especially if your running a modified inlet system.

I must admit,I've never seen or heard of anyone being prosecuted due to a roadside check,but I suppose it does happen.

What I'd do to start with is remove the cat and have a replacement pipe made up,then take it for an emissions test to see how close you can get.If your somewhere near the limits,then I reckon you'd get away with running it on the road without a cat.The fast idle will probably be somewhere near anyway,it's on idle that I think you'll struggle.

I'd rather push my Alfa than drive a BMW....
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post #8 of 13 (permalink) Old 31st August 2009
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There is no law saying any post 92 car must have a CAT fitted, you are well within the law to remove it and bin it if you really wanted to.

The problem comes at emission testing, if and its a big if your car will pass the test with no CAT, then that's fine nothing anyone can do about it, but most cars will need it to get a pass. Obviously, those running a decat pipe just swap it back over for the test, which is fine providing you don't get pulled on a roadside check. I've never been stopped so I have no idea on the score, I assume they give you similar to a GV90 ticket where you have x days to have the problem fixed and retested at an MOT centre, ticket stamped and produced at VOSA or police station.

I have had one car pass the MOT with a decat, but that was a conversion, and I blagged it that the engine came from a 91 car
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post #9 of 13 (permalink) Old 31st August 2009
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Over here in Northern Ireland MOT inspectors occasionally carry out roadside checks. They tend to pick heavy trucks coming off ferries and gatherings of boy racers at the weekends.
If a vehicle is found with the exhaust emmisions outside the legal limit thay have been known to issue penalty points as technically the vehicle doesn't comply with the Road Traffic Act.
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post #10 of 13 (permalink) Old 4th September 2009
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My sensi-wagon doesn't have one - being 1990 doesn't need one - hurrah

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