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Emissions Test


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  • 1 year later...

The emissions test tests your exhaust gas for carbon monoxide, nitrogen oxide, hydrocarbons and particulates. Aside from being an environmental thing, it's a good indicator of the condition of your engine and how it's running. If the fuel/air mixture is wrong, usually caused by a dirty/faulty sensor somewhere causing over or underfuelling. On older cars it was used to set up the mixture on carburettors.

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