Question

Technician A says that when there is a rich air-fuel mixture, the oxygen sensor will give a signal that is higher than 0.5 volt. Technician B says that if there is a low-voltage signal (0.4 volt or less) coming from the oxygen sensor, the computer will drive the system rich. Who is correct? Group of answer choices

a. Technician A
b. Technician B
c. Both A and B
d. Neither A nor B

Answer 1

Both Technician A and Technician B are correct regarding the operation of the oxygen sensor and the engine's response to its signals; the correct answer is c. Both A and B.

Step-by-step explanation:

The question pertains to the operation of the oxygen sensor in a vehicle's engine and how the sensor's data is used by the engine's computer to adjust the air-fuel mixture. Technician A is correct; an oxygen sensor outputs a higher voltage signal, typically above 0.5 volts, when it detects a rich air-fuel mixture, which means there is more fuel than oxygen in the exhaust.

Technician B is also correct; when the oxygen sensor signal is low (about 0.4 volts or lower), it indicates a lean mixture, which prompts the computer to enrich the mixture. The correct answer to the question is c. Both A and B.