Failed MOT-Really high CO2 emissions

[Dan_Oliver]

I went to get an mot the other day and it failed on the emissions.
The CO2 was really high, they said it should be or below 0.5 and mine is like 3.4. Also they couldnt communicate with my ecu either so dont know what the next step is. It has been chipped but wouldnt of thought that would affect it that much, it also has got a brand new cat on there as well. can any help with what this could be? cheers

[white16valver]

I thought they only measure CO (carbon monoxide) not CO2 (carbon dioxide) at MOT?

And I thought the CO limit was 3.5%?

Mine's always well high too! lol


Was the engine cold or hot? It seem you need to get it as hot as possible before you arrive as that will help reduce the emissions.

[LEIGH-ANNE]

Check my post with the pics - might be of some help, first is without cat and second is with the cat on

[Dan_Oliver]

Sorry yeah CO is what i meant lol.
Yeah they tryed driving it down the road and it was still way off lol
Would changing the ecu make any difference?

[cooper]

I thought they only measure CO (carbon monoxide) not CO2 (carbon dioxide) at MOT?

And I thought the CO limit was 3.5%?

Mine's always well high too! lol


Was the engine cold or hot? It seem you need to get it as hot as possible before you arrive as that will help reduce the emissions.

its 3.5% if its a non cat car :wink:

[white16valver]

Really?

MOT people must like me... :P lol

[white16valver]

Check my post with the pics - might be of some help, first is without cat and second is with the cat on
Link?

I can't find it :P

[Wobba]

Sounds like it needs a service, sparks, clean/replace dizzy and clean/replace the air filter while your doing it.

[Wobba]

lambda probably shagged as well.