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Code P0452 Fuel Tank Pressure Sensor Circuit Low Voltage
Sounds like a faulty fuel tank pressure sensor. It is located on the fuel pump housing.
FUEL TANK PRESSURE SENSOR REMOVAL CAUTION: Refer to Battery Disconnect Caution in Cautions and Notices.
FUEL TANK PRESSURE SENSOR INSTALLATION
Here is the diagnostic procedure for the fuel tank pressure sensor.
Code P0453 Fuel Tank Pressure Sensor Circuit High Voltage
Both of these codes should be solved by replacing the Fuel Tank Pressure Sensor.
If there is a system pressure leak, then you would have a different code. I believe that the sensor itself has failed.
Please let me know if there is anything else I can do to assist you.
2003 Jetta left rear window blue plastic part of the