All of the Following Statements Are True EXCEPT

Multiple Choice

All of the following statements are true EXCEPT:

A) on a late-model car running at 2,000 rpm with a hot converter, normal readings from the exhaust pipe should be above 0.1% (with an air injection system disabled) .
B) like HC, O₂ is not formed during combustion so it should be consumed during each combustion cycle.
C) before combustion, the incoming air is 21% O₂.
D) when checking O₂ emissions in the exhaust, it is very important that there be no supplemental air or exhaust system leak.