Failed emissions on my mk1 1.8t.

[BrassKnuckles]

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...

[kidology]

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

[BrassKnuckles]

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. 

[BrassKnuckles]

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. 

[cheezemonkhai]

Take it your sparks are working well?

 

 

[BrassKnuckles]

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...

[BrassKnuckles]

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