An oxygen sensor is being tested with a digital multimeter (DMM) ...

[kwoodring]

An oxygen sensor is being tested with a digital multimeter (DMM) using the MIN/MAX function. The readings are: minimum = 78 mV; maximum = 932 mV; average = 442 mV. Technician A says that the engine is operating normally. Technician B says that the oxygen sensor is skewed too rich. Which technician is correct?
 
  A) Technician A only B) Technician B only C) Both technicians D) Neither technician

Question 2

When testing an oxygen sensor using a digital storage oscilloscope (DSO), how quickly should the voltage change when either propane is added to the intake stream or when a vacuum leak is created?
 
  A) 1-3 seconds B) 100-200 ms C) Less than 100 ms D) 450-550 ms

[Mollythedog]

Answer to Question 1

A

Answer to Question 2

C

[kwoodring]

Thank you!

[Mollythedog]

Happy to help