p0452 , whats the cause

i have a 99 ranger 4 litre , and check engine lite came on, the code is 452 , fuel tank pressure sensor problem, wonder if anyone has had the problem before, i know i'm stumped, any help would be appreciated, thanks

Check your gas cap. The gas cap is supposed to be a pressure/vacuum relief valve design to allow air into the tank as fuel is used but at the same time prevent the vapor from escaping to the atmosphere. Check your entire Evap Emission Control System especially the Fuel Vapor Canister and the CANP Solenoid.