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The fault code says that the pressure in the distribution pipe is too high. There are various reasons for this.
A defective flow regulator on the pump is option number one. But I reject this possibility again, because you have replaced the pump and I do not expect that there is something defective in the new pump.
Possibility number 2 is a defective rail pressure sensor. This does not always have to be completely defective, but can also simply give an inaccurate value. If you have the possibility to read out the rail pressure with a diagnostic device when the engine is off but the ignition is on. This must be 0 bar. If the pressure deviates, either the sensor or the cable between sensor and control unit (internal resistance, corrosion) is the cause.
If the pressure is 0 bar, an injector return flow measurement should be made. If the rail pressure is too high, it can be expected that one injector will return significantly more or less fuel than the other injectors. The corresponding injector should then be replaced.