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I have been using various search engines to find information on Cat emissions and the uk law surrounding them.
I have failed to find any proof that you *actually* require a cat to be fitted to your vehicle during an MOT test.
the only thing I'm sure of is that it must pass the actual emissions test itself. As I read it, If the "sniffer" records levels of emissions within the critera specified then you should obtain a pass.
Would the "sniffer" be able to pass a vehicle without a cat?
Would a well tuned engine be able to pass the test without a cat ??? (same qustion but worded better)
Vehicles sold in several parts of the world (especially the Middle East, Africa and South America) often do not meet European emissions standards. Please note that petrol-fuelled cars manufactured after August 1992 are required to meet standards that can currently only be achieved by a catalytic converter.
This is from the Dept of the Environment
Oh, yes, the ONLY engine that COULD pass without a CAT is one which ISNT running!!
In the UK, all cars sold in the home market have to pass the MOT or roadside emissions test to get UK/Euro Type Approval.
It doesn't matter how it achieves that, but as said no modern petrol driven car is likely to pass the current emissions test without a 3 way closed loop catalytic converter - so by default it has to have one (or more) cats.
Went in the garage this afternoon to ask why the cat that was in the boot when I paid a deposit on the car, was not in the boot when I picked it up !
Answer was.... (after trotting off to the service dept)
"I dont know but he (sevice gentleman sculking in service bay) says that you don't actually need the cat. I'm sure we can sort something out when you bring it in for an MOT".
"I think you'll find you do need a cat" I said "it's not joe public you can fob off here" (hope that bit wasn't too harsh, he was such a nice bloke when making the sale ) "I would like the cat that was in the boot when I viewed the car" (salesman goes a little pale here hehe) "I'll look into it" he said.
I promtly left....
Did I do the right thing
Okay all MY's all models had a cat in the Downpipe
UK pre MY01 also had one in the centre exhaust section
MY01 onwards have in the uppipe as well (making 3 cats I think)
MY02 STI Uk only have two cats I think (no uppipe one just dp and centre)
The PPP removes the centre cat hence the reason it was in the boot as the car has been PPP IIRC
It also appears the previous owner of N5PUGs car may also have fitted a decatted downpipe. This means that N5PUG has two options either get a centre or downpipe cat to pass the emissions test. Either would mean the car should pass. Its easy to swap the centre and a lot more difficult to do the downpipe.
Not sure about law wise but I thought every petrol car had to have from 1992 onwards.
All engines must have one, it reduces Carbon Monoxide in the atmosphere and this is how. The catalytic converter is a compartment in the engine that contains oxygen. This is how the reaction occurs, Carbon Monoxide is 1 Part Carbon and One part Oxygen, while Carbon Dioxide is one part Carbon and 2 parts oxygen. When the Carbon Monoxide passes through the catalytic Converter it is oxidised meaning that Another oxygen atom will be added to it, causing The Carbon monoxide to have one part Carbon and Two atoms of oxygen, therefore turning the Carbon Monoxide into Carbon Dioxie. I will Tell You a Secret though, Most of the Carbon Monoxide pollution in the world doesn't come from cars. It comes From Tree leaves when they go through a process called 'Leaf Necrosis' which is when leaves turn from Green to yellow and get dry and crumple up, they release Carbon Monoxide during this process.
I thought I had explained in my previous post......but no, a car does NOT have to have a cat in the UK. But it won't get through the Euro 3 or 4 emissions regs, and get Euro Type Approval to be sold in the UK without one (or two) cats.