P0440 code?

[PrixieGirl69]

Last night the service engine soon light came on and went to advance auto parts and got the codes read and it came up with a P0440, people are saying the gas cap but i dont think thats the problem, this light came on after i installed new hid bulbs, idk if thats the issue because the code has to do with EVAP and emissions please let me know what i cud do too check myself and where its located at thanks

[PrixieGirl69]

1999 pontiac grand prix GTP

[BillBoost37]

Start off by removing the gas cap, cleaning the sealing surfaces and reinstalling it.

This should not have anything to do with the hids.

[PrixieGirl69]

Okay and once i do that if it did fix the issue will the light go out? If not where do i look next

[BillBoost37]

It will take at least 3 drive cycles (driving say 10-30 min each cycle) to test and turn the light off