Hi there
I have an au2 wagon
When i close lock my door the back passenger door makes a grinding sound and then does not lock
All the other doogs lock but not the back
Because of this if you pull on all the other door handles they cannot be opened but if you pull on the back passenger side on it opens up and then also makes all the other doors unlicked to

any ideas?

The Actuator gear is stuffed. Replace it.