An oxygen sensor in a fuel-injected engine is slow to react to changes in air–fuel mixture. Technician A says that the O2S may need to be replaced. Technician B says that driving the vehicle at highway speeds may restore proper operation of the O2S. 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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