Hi all.I'm having a problem with a 118i bmw 2005 model.on diagnosis there are 2 faults that do not want to clear.The faults are 2A67-valvetronic,internal fault and the other fault 2A69-valvetronic,power supply actuator motor.The valvetronic unit or motor has been replaced and the faults still arise.what could the problem possibly be?thanks in advance