What does P0496 evap emission high purge flow fault mean?

Answer 1

this code defines a unwanted amount of vapors being released in system, usually this code pertains to a faulty purge valve & or could be the tanks pressure sensor.

sometimes a faulty gas cap, but usually that is another code. the po496 is high purge flow detection, and can cause irregular starting conditions after a fill up. sometimes it makes it very difficult to start, and engine shows signs of stumbling. this type of testing should be done by a certified emissions technician that has special system pressurizing equipment.otherwise you can be replacing a lot of not needed components.usually i find a purge valve leaking with this code. hope this helps someone..