All of the following statements are true EXCEPT:
A. the fuel system monitor operates continuously when the fuel system is in closed loop.
B. the heated oxygen sensor monitor (HO2S) changes the injector pulse width while it checks the upstream O2 sensor to see that its oscillating frequency is fast enough.
C. O2 sensors are monitored even before closed loop.
D. a pre-catalyst sensor is called S0 and a post-cat sensor is called sensor 1 (S1).
Answer: D
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