2003 pathfinder trouble code

[pkmcd99]

my r50 model is running awesome, except the "service engine" came on. I did onboard diagnos' this code came up: P1456 whats this mean?

[csutke]

Evap very sml leak. Go to phatg20.net and you can DL the FSM, what your looking at is on page EC-611

[revgolem]

First step in all evap leak codes - remove and retighten the gas cap, clear the code and see if it comes back. if you were to go to a shop this is exactly what your first hour of diag time (at full shop rate) will be spent doing.

[pkmcd99]

First step in all evap leak codes - remove and retighten the gas cap, clear the code and see if it comes back. if you were to go to a shop this is exactly what your first hour of diag time (at full shop rate) will be spent doing.

so ive reset the ecu, and re-tightened gascap. light comes back on after about 20 miles. same code. P1456 now what?