My Octavia has failed on emissions to the point it could possibly be a train in the shape of my Skoda.  3.45% CO fast idle.Natural idle 4.45%. I've worked hArd on this car and will continue to. Any help with this would be grateful right now...

Put some cataclean in the tank and go for a blast. Normally works wonders on mot fails.

Thanks Kidology. Unfortunately I've been there n done that even went as far as spending £175 on new cat. Someone said something about Lamda sensor but that new too. 

Just a quick question to those who know. Will a MAF sensor throw out my emissions test? It's so over the top it's unbelievable. 4.57% CO.... Need some serious advice please... I've change Lambda sensors Preston and Post. And also a new Cat. 

Take it your sparks are working well?

 

 

Yes renewed them also... Any ideas what else it could be?. New maf sensor on her tomorrow morning. I'm lost as what else to do now...

New MAF sensor sorted it. Never knew they were so important. Oh well all done now. Thanks for your help....