Hi,

 

As seen in another post I've changed my front pipe to have a sports cat.

 

My question is why do I now have a change in emissions.

 

On two previous MOT emissions with VAG cat CO was zero for both fast idle (2500-3000 rpm) and at idle.

Now with a sport cat (Tony Banks) the CO is 0.12 (limit 0.2) at 2500-3000 rpm and 0.1 (limit 0.2 (limit 0.3).

 

Is it that the VAG cat is perfect? or is there another VAG emissions cover up?

 

The OEM cat was doing a better job than the replacement. Or...another change was made, or has happened, since the last MOT.

Something like a coolant temperature sensor reading wrongly, or a 'tired' lambda sensor. Put the other cat back on and re-test it if you really want to prove that the sports cat is the cause.

Forgot Cat change wasnt only thing fitted pipercross filter.

 

They're the only two things changed since MOT which in Feb this year.

 

Diagnostic error said cat not working so got emissions test to confirm. Going to have ECU cat diagnosis deleted in remap.

That was quite a recent MOT then. Does seem to show that the sports cat is doing a poor job.

Looks that way , Tony Banks never warned me of this being a problem, he said it's because the ECU recognizes  a VAG cat and not a third party one. He also said he can remove the light fault code. Well I'm getting the remapper, Unicorn Developments, to do that.

After all it still passes emissions by a healthy margin. I'm surprised that other Briskodians that have had sports cat ,Longlife or Powerflow , fitted haven't reported on forum.

?

Not that many have had it done on a 1.2 TSI with a remap.

Others have reported emissions  issues with Sports Cat's on 1.4 TSI Twinchargers.

 

Is it a 86PS 1.2TSI you remapped?

Offski, yes