Fuel pressure too high

[Remegano79]

Hello.
Sorry for my english.
I'v been searching the problem in my car of high fuel pressure now for many years. Megan 2 1,9dci 88kw was my first diesel engine car. But unfortently this car had very strange issue. Sometimes the engine begin doing very hard knocking sound and in daschboart seen light check injection.
For now i'v replace many sensors and regulators like fuel pressure regulator, fuel pressure sensor, 2 injections, crankshaft sensor, air flow meter, install new egr but the problem is still stay. Replace in fuel rail pressure valve too.

I have been searching on net information about fault df053 but allmost problem is pressure low.

Please give some advise what or where i must search to finnaly find the issue

[Remegano79]

Diagnostic tool shows that in the idle speed fuel pressure about doube high like 630bar.