Question

an oxygen sensor is being tested with a dmm using the min/max function. technician a says that a good oxygen sensor should be able to produce a value of less than 100 mv and a maximum voltage above 900 mv. technician b says that you should replace any oxygen sensor that fails to go above 700 mv or fails to go lower than 300 mv. who is correct?

a) neither technician a nor b

b) technician a

c) both technicians a and b

d) technician b

Explanation:

To determine who is correct, we analyze the statements:

• Technician A: A good oxygen sensor should produce less than 100 mV (minimum) and above 900 mV (maximum). This aligns with typical oxygen sensor performance (min ~ 0 - 100 mV, max ~ 900+ mV).
• Technician B: Replace sensors that fail to go above 700 mV (max) or below 300 mV (min). A faulty sensor may not reach proper min/max, so replacing such sensors is correct.

Both statements are consistent with oxygen sensor testing: A defines good sensor specs, B defines when to replace faulty ones.

Answer:

C) Both Technicians A and B