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The gases in your car are likely to be about 78% nitrogen, 21% oxygen, .9% argon with traces of other gases like CO2 - in other words air. Diesel fuel has an odor, exhaust fumes have an odor, so if you don't smell anything and the CO detector isn't reading anything then there's likely nothing amiss. Hydrocarbon fumes would cause other symptoms like nausea. A ...

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