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This code is set when there is a high voltage reading coming from the fuel tank pressure sensor. It could be a problem with the wiring going to the sensor... or the sensor itself.
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P0453 FORD - EVAP Pressure Sensor/Switch High Possible causes- Evaporative Emission System (EVAP) Pressure Sensor/Switch harness is open or shorted - Evaporative Emission System (EVAP) Pressure Sensor/Switch circuit poor electrical connection - Faulty Evaporative Emission System (EVAP) Pressure Sensor/Switch - Damaged fuel tank pressure sensor
This likely is an emission system warranty problem.
A P0453 is an EVAP emissions code that refers to the Fuel Tank Pressure sensor. You're going to want to check the wiring & connectors leading to the FTP sensor.
I found an excellent article here with step-by-step procedures to help: P0453
P0453 is for the fuel tank pressure sensor. This code means that the voltage on the sensor was greater than 4.5V during key on engine off or during any engine operating mode.
Normal voltage from this sensor with no vacuum or pressure on the system should be 2.37 to 2.97V.
PCM sends a reference voltage of 5V to the sensor and tells if there is pressure or vacuum in the fuel tank by the voltage that returns from the sensor.
Possible causes are:
FTP circuit open
VREF shorted to VPWR
Damaged PCM
FTP circuit shorted to VREF or VPWR
SIG RTN circuit open
Damaged FTP sensor
Usually it is a loose connector at the sensor or a bad sensor.
It mounts on top of the fuel tank,has a 3 wire connector. To replace it you have to push down on it and twist,if I remember right CC.
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