An oxygen sensor (O2S) is being tested and the O2S voltage is fluctuating between 800 millivolts and 200 millivolts. Technician A says the engine is operating too lean. Technician B says the engine is operating too rich. Which technician is correct?
a. Technician A only
b. Technician B only
c. Both Technicians A and B
d. Neither Technician A nor B
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