In the Emission Inspection System, a dilution error indicates which condition?

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Multiple Choice

In the Emission Inspection System, a dilution error indicates which condition?

Explanation:
Dilution error shows up as more air being mixed into the exhaust sample. When outside air dilutes the sample, the mixture contains more oxygen than it should, so the EIS reads a higher O2 level than normal. That elevated oxygen reading is what signals a dilution problem. High CO or high NOx would point to combustion or engine conditions rather than a sampling artifact, and CO2 would typically be reduced by dilution rather than increased. So the strongest cue indicating a dilution error is the high O2 reading.

Dilution error shows up as more air being mixed into the exhaust sample. When outside air dilutes the sample, the mixture contains more oxygen than it should, so the EIS reads a higher O2 level than normal. That elevated oxygen reading is what signals a dilution problem.

High CO or high NOx would point to combustion or engine conditions rather than a sampling artifact, and CO2 would typically be reduced by dilution rather than increased. So the strongest cue indicating a dilution error is the high O2 reading.

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