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.
Answer: A
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