A vehicle is running rich. Technician A says that overfilling the fuel tank can cause the carbon canister to become saturated with gasoline, which can cause a rich running condition. Technician B says that an exhaust leak upstream from the O2S could be the cause. 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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