[windy1603]

Could be wiring for fuel pressure sensor has rubbed on the egr valve causing a short or the fuel pressure regulator is sticking both common faults

Not very common but worth a try is to unplugging electrical connector to egr valve and try the car.

Some variant of the 1.6 hdi (sure with Bosch injection) have an issue that if the EGR fails and shorts out internally it kills the power to some of the other engine sensors such as boost and fuel pressure sensors which triggers random bogus codes.

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[windy1603]

Glad you fixed it strange code fuel leak for fuel filter it normally only triggers a low fuel pressure warning

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