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The fuel is burning less efficiently than it should be. Possible causes might include worn out/dirty spark plugs, worn out catalytic converter, or impurities in the fuel tank.

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Q: A vehicle's tailpipe emissions are being checked with a four-gas analyzer The level of C02 in the exhaust gas is lower than normal and the level of 02 is high?
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Related questions

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Anyplace that does vehicle emissions tests.


Which pollutants are checked in pollution check?

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