BMW E90 testing Valvetronic &Vanos solenoids system part2

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hello.
i have a BMW E91 320i 2006 model and i have always, only, the fault code 2A70.
i change spark plugs, coils and battery.
still same code.
then i measure the voltage on valvetronic motor with car off and it was 3.9 - 4.1 volt
then i power up without pressing then clutch and still the voltage was 4.9 volt maximum on valvetronic.
sometimes is not crank with the first time . i dont feel any power loss but it consume more fuel.
what else could i test ?

neogr