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Carsten Hjorth

High idle co fail mot

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Hi!

My wifes 2008 Aygo failed the MOT here in Denmark. Idle CO was fine, but high idle (2500 rpm) was 0,5 where 0,3 is the limit.

I am thinking the cat is bad?

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Do you just do city driving or highways/motorways

Sent from my G8341 using Tapatalk

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I think Gampla has the right idea..if the car is only used for short trips it could need what I think is called an "Italian tune up", that is drive it at quite high revs on the open road to get the cat nice and hot and hopefully blast any contaminants out of it so it starts working properly again.

The cat could be beyond saving but it is worth a try first. That treatment certainly got one of my cars through the MOT after it had initially failed due to excess emissions. There are products like Cat Clean, I think, that could help too.

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Installed a new cheap cat, and all is good!

/Carsten

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