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Discussion Starter · #1 ·
my friend has a honda civic completly stock and it wont pass smog. what causes the co2 levels to be almost double? is it an o2 sensor? or do you think its an catilytic converter or egr?

need help asap!!!
 

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I wasent even close to passing it in my brick. I had 8.4% Co2, and max was 4.5% :p I have heard (at least on a turbobrick) that it could be: o2 sensor, bad airfilter (try getting a new one, or cleaning your old one), bad sparkplugs (change sparkplugs), or running too rich. Hope this helps.
 
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