A technician connects a DMM with a MIN/MAX/AVG function to the output of an oxygen sensor. The engine is run at 2000 RPM for several minutes. During the test, the voltage toggles rapidly between 150 and 900 millivolts. At the end of the test, the MAX voltage was .967 V, the MIN voltage was .087 V, and the AVG voltage was .683 V. Technician A says the sensor is faulty and should be replaced. Technician B says there could be a vacuum leak that caused the sensor voltage to have a higher than normal average. Who is correct?
A)A only
B)B only
C)both A and B
D)neither A nor B

Question

Quizplus · Accepted Answer

The oxygen sensor's voltage readings are within the normal operating range (150 to 900 millivolts), indicating it is functioning correctly. The MAX and MIN values are also within expected fluctuations for an oxygen sensor. A vacuum leak would affect the air-fuel mixture but is not directly indicated by these voltage readings alone.

A Technician Connects a DMM with a MIN/MAX/AVG Function to the Output