Hi all, I'm wondering how exactly to go about getting my Fabia de-catted, while having the dashboard light remain unlit ?

...as I understand it, there are two sensors on the exhaust system, either side of the cat. One of which, telling the ECU about the pressure inside the system etc. Now obviously, having a de-cat pipe fitted would feed the sensor some dodgy information and would light up an error light on the dash, this doesn't bother me much, but then I wouldn't know of anything else going wrong if I just put up with it being on.

So ! - Is there anything I can do, with the de-cat fitted, to stop the light coming on ? and therefore I would be informed of any other problems by the light coming on for something other than the De-cat.

Thankyou Please

You might find that the MOT man doesn't like it much.

Hi all, I'm wondering how exactly to go about getting my Fabia de-catted, while having the dashboard light remain unlit ?

Why?

It won't gain a mass of power, the fuelling will be shot, and as has been said, you'll never pass an MOT.

Not to mention all the Carbon Monoxide, Hydrocarbons and the other nasty stuff that you car would start to poison the atmosphere with. Catalytic converters have vastly reduced the health-damaging pollution that cars emit - why would you want to stop the good that they do? Unless you are incredibly selfish, that is...

It's worse than that: a cat-equipped car has fuelling modified to suit the cat (deliberate over-fuelling sometimes, for example), so removing the cat will make it emit more pollutants than a car that never had one.

The MOT man wouldn't care as long as it passed its emissions test, which without a cat is fairly unlikely.

telling the ECU about the pressure inside the system

Nothing to do with pressure, the probes measure oxygen content.

Is it just me, or can I (me personally) never get a straight answer on here ?

...You immediately ask me why I want my car de-catting, yet when someone wants to put a big 1.8T lump in his fabia (as I read only last night) you all welcome him with open arms and inform him to go for it and wish him well. Why ask me why I want it doing ? The fact is, I do, so why not just help a fellow Skoda owner out and give me some information about the process of doing it ?

And dont even begin to try and play the "oh but your damaging the atmosphere" card.. The day they take planes from the sky and stop throwing dirty bombs at people half way across the earth, I'll get my push bike out and cycle everywhere. Until such a day, they can kiss my a*se quite frankly. - Of course, now I'll no doubt come in for some stick about being rash and losing my temper at nothing, but whats led me to it ? The members of this bloody forum never helping me when I ask something..

Lummox & cjb, thankyou both for your respective replies, as they are the only ones with anything in them I needed to know. Would either of you happen to know if there is any way around it ? - I'm not soft in the head, I just wont get it done if it will end up damaging the car. My thinking was, to find out the adverse effects it would have on the car, then decide from there. But if all most of you have to offer is "it wont pass an MOT.." then it looks doubtful I'll get anywhere with my search for answers.

Now unless YOUR very selfish, how about answering MY question. Would you rather see a perfectly good car run into the ground because it's owner quite politely asked about something but wasn't informed and went ahead blindly, than one that was saved by people kindly taking the time to put the owner right ? I'll leave that upto you boys......

Stu

:gay:

OOOOOOOOOoooooooooooooooooooooooooooooooooooooo!

Edited 10 August, 200817 yr by DGW
Redundant quote of previous post deleted.

What he said^^^.

they can kiss my a*se quite frankly.

And it's not "they", it's "we". That is, pollution harms everyone, including YOU! It's not even CO2/climate change we're talking about, which you very possibly might not believe in for your own reasons, but the type of pollution that directly harms people. If we don't all do our bit then the game's over.

I know it's fashionable today to do whatever you want and screw anyone else, but that way leads to hell. There is such a thing as the common good, and I would like to think (call it wishful thinking if you like) that most people at least partly believe in it.

My Fabia VRS is decatted.

Its great.

I had my 20v toledo decatted, it made it sound rough, but i dont remember them playing about with any sensors and i never got any lights comming on

My Fabia VRS is decatted.

Its great.

A diesel is a different kettle of fish and not really relevant tot he OP's question.

As for decattting you may be able to get a replacement pipe made up. You may be able to space the rear lambda probe out so it reads atmostphere and thinks the cat is working. However its unlikely it will pass and MOT and its alot of ballache for not much gain tbh.

...You immediately ask me why I want my car de-catting, yet when someone wants to put a big 1.8T lump in his fabia (as I read only last night) you all welcome him with open arms and inform him to go for it and wish him well. Why ask me why I want it doing ? The fact is, I do, so why not just help a fellow Skoda owner out and give me some information about the process of doing it ?

It's up to you, of course, but I just don't think the small power gain is worth it, and to have it work well you'd need to somehow fool the ECU (remap?), so if you feel your Fabia isn't quick enough, my advice would be 'buy something quicker' as it will be cheaper and better in the long run. I also wouldn't bother dropping a 1.8T into a Fabia- I'd buy a car with the 1.8T- but the performance gain there could be considerable- the 1.8T is 150BHP in standard trim and will go well the other side of 200 for a relatively reasonable sum.

A diesel is a different kettle of fish and not really relevant tot he OP's question.

As for decattting you may be able to get a replacement pipe made up. You may be able to space the rear lambda probe out so it reads atmostphere and thinks the cat is working. However its unlikely it will pass and MOT and its alot of ballache for not much gain tbh.

What he said. A diesel doesn't need a cat by law, and the MOT test only leasures smoke, so a decatted diesel will still pass. There's also no Lambda sensor to fool.

@Lummox: Is that a recognised way to fool a Lambda sensor? Not something I really know about.

I had my 20v toledo decatted, it made it sound rough, but i dont remember them playing about with any sensors and i never got any lights comming on

How did it peform afterwards? Any MOT problems?

A guy on the corsa website decatted his 1.8 sri and it caused his ECU to blow up.

What he said. A diesel doesn't need a cat by law, and the MOT test only leasures smoke, so a decatted diesel will still pass. There's also no Lambda sensor to fool.

@Lummox: Is that a recognised way to fool a Lambda sensor? Not something I really know about.

I'm not sure if they work but you can get spacers that screw into the hole for the lambda probe. They then hold the probe out in normal air stream, seen them but never used one.

A diesel doesn't need a cat by law

Actually a petrol doesn't need a cat by law but there is *NO* way it will pass an MOT without one .....

Why do you want to decat ? Do you need a replacement ? Decatting will do little for the performance on the 1.4 MPI.

I'm not a performance junkie... I'm a young lad who wants a much louder car. As for MOT time, thats my problem. The chap who maybe undertaking the task will simply make them swappable by way of flanging the cat/de-cat pipe so it's easily swapped when needs be

Thankyou for the useful answers that are flooding in, many thanks infact, it was totally unexpected. Cheers guys

...as for the emissions crowd who pester me so incessantly, what started the last Ice age then smart arses ? I dont think anyone had cars or bikes back then - yet that started and cleared up on it's own alright. If you knew as much as you'd like to think you do about the earth and it's cycles, you'd know the earth is in a constant swing between ice age and soaring periods if intense heat. Climate change and all the other waffle is a posh way of terming "nature". As much as preach to me, I'm obviously not going to change my opinion just to suit yours, so if you carry on with it then more fool you. You'll be wasting your breath chaps...

Stu

lol i you need to know certain people to get a petrol car without a cat through a mot , my cousin has a full exhaust from manifold back and as soon as he de catted the car it made a vast improvment, it still has the hole for the labada sensor and his car is fine, i think its abit to late to worry about how much carbon etc extra is being let out! the amount of airplanes etc its not worh bothering really, and think of all them cars made before 1992 with no cat!! old fashioned people hay

Oh I know a couple of people who'd happily pass it with the De-Cat...

Thats my point, when the people who are expected to know better and who are in a position of trust etc - ie politicians and the like - stop polluting our surroundings, then I (the average joe) will happily follow suit. Maybe when they finally stop arseing around playign war games with each other, we'll all also enjoy lower road tax as we wont be paying for George Bush's war. That'd go nicely with a clean environment, but dont hold your breath, eh ?

Stu

...You immediately ask me why I want my car de-catting, yet when someone wants to put a big 1.8T lump in his fabia (as I read only last night) you all welcome him with open arms and inform him to go for it and wish him well. Why ask me why I want it doing ? The fact is, I do, so why not just help a fellow Skoda owner out and give me some information about the process of doing it ?

We ask because the 1.4 is not a very tunable engine and all a de-cat will do is bugger it up.

The members of this bloody forum never helping me when I ask something..

Telling you it'll fail the MOT is helpful. You asked a question and got answers. Stop whining.

But if all most of you have to offer is "it wont pass an MOT.." then it looks doubtful I'll get anywhere with my search for answers.

Surely if that's the majority of replies you might think that there is something to it?

Now unless YOUR very selfish' date=' how about answering MY question. Would you rather see a perfectly good car run into the ground because it's owner quite politely asked about something but wasn't informed and went ahead blindly, than one that was saved by people kindly taking the time to put the owner right ?.

Stu[/quote']

If you de-cat it, that'll fail the MOT. Question answered. Now stop whinging. If you don't like that answers then bugger off. We try and help people but when people like you don't get the answers they want and get shirty, it puts the rest of us off being helpful.

Oh well if we're getting technical... "bugger it up", will it ?

Why would it ? What's it gonna do to it ? - THAT is what I was asking for, if it'll knacker the car, I wont do it, whether it'll pass an MOT or not is the furthest thing from my mind, and thats not the answer to the question I asked.