I have a 2002 Hyundai XG350 that throws code PO446, "canister close

[Cecil]

valve malfunction and code PO452 how tofix? this car continually will throw these two codes, and I would like to know how to fix them myself if possible, the code po452 says in book that it is "fuel tank pressure sensor low voltage" does that sensor need to be changed, and where is it, if so
this car throws code po446 which says canister close valve malfunction, and code po452, which says fuel tank pressure sensor low voltage, how to fix these problems

[shawn]

p0452 is part of the evap emissions system. you need a service manual and a vaccum pump and guage. Yoll need to find out where the pressure is being lost?. Youll locate the evap system circuit and start putting vaccum on the system at diff points to find the issue. could be a vac line or a charcoal canister. I have even seen a purge valve throw that code.