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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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co is tricky cuz most times when you lower co, nox goes up. not sure how to fix it since the car isnt in front of me. but was the car hot when he went to test it?
 

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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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