Two technicians are discussing the testing of a catalytic converter. Technician A says that a vacuum gauge can be used and observed to see if the vacuum drops with the engine at idle for 30 seconds. Technician B says that a pressure gauge can be used to check for backpressure. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
Question 2
EGR systems ________.
A) Are used on all vehicles B) Reduce NOx emissions
C) Both A and B D) Neither A nor B
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