This steppen motor is very expensive and before you order check the following.
95% of the time there is nothing wrong with the steppen motor so get it diagnosed properly first.
The resistance of this steppen motor meassured between the nummber 1 and 3 of the terminals should be between 28 and 36 Ohms Nummber 3 is in the middle and it makes no different from which side you start which means there are two terminals 3 in the middle
Also check if the valve in the valve body is not sticky.
The steppen motor faultcode also will come up when the primary pulley is seized or is not moving properly.