I have a friend who's check engine light came on last night. She took it to Auto Zone and it gave her a code "evaporative vac solenoid circuit malfunction". What the heck is that and how do I fix it? Thanks
Autozone should have given her the code, rather than the description. The text description varies from code reader to code reader. It would also help to know what year her car is. Is it a 'Stang, or something else? When did the CEL come on? During driving, or as soon as she started the car?