De-CAT potential problems.

[Phil]

Firstly, I hope this is in the right place - I find there are too many forums and sub-forums on here!

I want to De-CAT my 1.8T Octavia. I've asked about potential problems on Briskoda.net but there doesnt seem to be a clear answer.

If I cut out the CAT and replace the CAT with a clear pipe section, I believe the vehicle will just scrape through the MOT emissions test, however, I am expecting problems with the lambda sensors giving confusing signals to the ECU.

Has anyone had any experience of de-CATing a 1.8 20VT ?

 

[m0rk]

It won't pass an MOT without a cat - no chance at all.

You will have a MIL light as well, unless you run Revo Stage 2 code which ignores the cat failure Lambda code

 

[Phil]

I know someone with a Jabba remapped Octavia that has got a car through an MOT without the CAT. Apparently it is on the edge though and you must ensure the climate control is switched off.

 

[Feel]

No direct experience but: I doubt you'll pass emissions, you might scrape through, but I doubt it.

Unless you run a remap that disables the second lambda sensor you will get a light on the dashboard and a fault code logged that tells you that your cat is below efficiency (i.e. that it has failed),

Edit: Must type faster

 

[m0rk]

I know someone with a Jabba remapped Octavia that has got a car through an MOT without the CAT. Apparently it is on the edge though and you must ensure the climate control is switched off.

Seriously - you won't - it's the fact that the emissions that the cat 'catches' the level is so low that it'll detect there is no cat.

why not just buy a sports cat?

 

[Deejay]

mine failed with no cat, listen to Mork^