A customer brings in a late-model Nissan with the check engine light on. There are no driveability complaints, either from the customer or noticeable to a technician on a test drive. When checked with...

A customer brings in a late-model Nissan with the check engine light on. There are no driveability complaints, either from the customer or noticeable to a technician on a test drive. When checked with the scan tool at the OBD II DLC, the computer indicates a problem in the charcoal canister purge system. What is the most likely cause of this problem? How long should the repair take if the most likely cause is the real one?