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Are all parts you recently replaced OEM?
Common causes for these two trouble codes are the non-return valve or electric change over valve (you replaced this).
Do you hear the pump running after starting the motor (cold)? You should here a whine sound from the rear passenger side of the car for a ~minute after starting the motor.
You might have an electrical issue to the system/valves??
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Jäger
300K Mile Club
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