Two technicians are discussing a state emission test. Technician A says that a vent valve that is not able to close can cause the system to fail the on-board test. Technician B says that a leaking gas cap can cause a failure of the EVAP test. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

correct option is C

both Technicians A and B are right

Explanation:

Test cycles specify the specific conditions under which the engine or vehicle is operated during the emission test. The vent valve that is not able to close can cause the system to fail the on-board test. Also, a leaking gas cap can cause a failure of the EVAP test. 

There are many different test cycles issued by various national and international governments and working groups

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