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Model specific boards => Golf mk4 => Topic started by: jockgti on 21 September 2011, 16:33

Title: Decat
Post by: jockgti on 21 September 2011, 16:33

Hi,if i fit a new downpipe and decat obviously that will flag engine management lights on dash,did i read somewhere that this can be sorted with a quick remap fix? if so what happens when its MOT time and the cat goes back on?

Title: Re: Decat
Post by: Dave_IOW on 21 September 2011, 17:22

First part is a yes.

2nd no idea

Title: Re: Decat
Post by: barrym381 on 21 September 2011, 18:14

most de-cats systems are a simple bolt on-off so easy swap come mot time but as long as emissions are ok shouldnt be a prob

Title: Re: Decat
Post by: jockgti on 21 September 2011, 18:33

i was wondering more if the bit of code they change/delete would make everything work ok when cat is put back on

Title: Re: Decat
Post by: daz veedub on 21 September 2011, 19:16

when i had cat put back on for m.o.t had no lights come on  :undecided:

and same when decat put back on after had no problems

Title: Re: Decat
Post by: magsmagsmags on 21 September 2011, 19:28

as far as i know all thats done when they map the light out is increasing the threshold on the second lambda so when its reading high emissions (which would normally be as a result of a knackered cat) it doesn't show anything. If that is the case, then putting the cat back in still wouldn't show any lights as it'll be well within the tresholds

Title: Re: Decat
Post by: jockgti on 21 September 2011, 19:33

ok cool a downpipe and decat it is then

Title: Re: Decat
Post by: km on 21 September 2011, 19:35

am i right in saying early golfs only have 1 lambda sensor so there would't be any lights anyway?

Title: Re: Decat
Post by: stevelfc on 21 September 2011, 20:44

yes only 1 lamba sensor but this still can bring on the engine light or put it in limp mode as the sensor wont be reading the exhaust gases

Title: Re: Decat
Post by: Wazzzer on 21 September 2011, 21:41

no it won't as they don't have an engine management light  :grin:

Also they read the gasses before the cat so a decat doesn't affect the ECU at all

Title: Re: Decat
Post by: jockgti on 21 September 2011, 21:57

what counts as an early golf?

Title: Re: Decat
Post by: Wazzzer on 21 September 2011, 22:02

AGU for definite, not sure on the ARZ

Title: Re: Decat
Post by: barrym381 on 21 September 2011, 22:08

if im ryt the op golf will be an aum so would have management light

Title: Re: Decat
Post by: jockgti on 22 September 2011, 06:04

I have a 51 plate AUM

Title: Re: Decat
Post by: rio_gti on 22 September 2011, 12:40

ARZ has 2 lambdas....... but with the right de-cat you wont get any management lights come up  :tongue:  :wink:

Title: Re: Decat
Post by: cardconvict on 22 September 2011, 17:32

rio_gti which decat did you buy i also have the arz and looking for a decat tomorrow which one did you get

Title: Re: Decat
Post by: jockgti on 22 September 2011, 19:19

i've been looking at a milltek de-cat

Title: Re: Decat
Post by: Dave_IOW on 22 September 2011, 19:22

Quote from: jockgti on 22 September 2011, 19:19

i've been looking at a milltek de-cat

Rich man..

Title: Re: Decat
Post by: jockgti on 22 September 2011, 21:17

cashing in a savings thing i've got so wife said i can spend it on car if i want but it will be last money spent on it and i have to keep it for a while so i don't have a set amount yet,might lose a bit with cashing it in so will just have to see,still unsure what i want to do,power or looks