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hi my corsa has got a 2litre c20ne engine in and today it failed the mot on emissions these were carbon monoxide content after 2nd fast idle excessive, emissions lambda reading after 2nd fast idle outside specified limits, emissions carbon monoxide content at idle excessive any ideas?
 

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looking at the fact the carbon monoxide emissions seem to be the problem, i would say the fuel isnt being burnt properly. could be either the air intake or the ignition system needs a slight upgrade. some would say that its the cat, but that would also put the other emission levels higher.

i would advice checking the filter on the airbox (or the induction kit) to check how clean it is. as well as taking spark plugs out and giving them a clean.

one thing that brings emissions down is a good thrash before an MOT... tried and tested trick of the trade ;)
 
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