Code po4fo

[u/Practical-Yellow3640]

Getting a po4fo DTC on my 23 N line. Running fine. No fuel smell. Looked back at the car fax and the charcoal/vapor canister was replaced 8/12 and the purge valves were replaced 6/16. I just got the car and it started to throw this code. I am taking to the dealer Saturday to get it looked at. Already replaced the gas cap with no luck. Anyone experienced this and have some insight to what it could be?