Here is my rough list on why customers have a return to the dealership with the same or very similar complaint. (I am sure I missed some reasons so I hope others have additional thoughts.)
1. Job is right, but fails in workmanship
2. Job is right, but fails due to replacement part
3. Job is right, but additional repairs are needed (normally done to minimize expense - think of turning rotors, but vehicle returns; or lubing suspension components to cure a squeak.)
4. Job is right, but another failure occured
5. Job is wrong, tech misdiagnosised the core problem
6. Job is wrong, advisor did not properly narrow down the problem - led tech in wrong direction
7. No work previously done, parts ordered
8. No work previously done, NPF
If you're looking at quality of repair then you're really concentrating on the tech's work. Only #1 and #5 are their fault. My experience is that why those are more memorable, the other six reasons are actually more likely to cause a "comeback" as defined by the manufacturer (i.e., did you have to return to the dealership for the same repair).
It is a good practice to track all comebacks and code them in some way like the above. That will allow you to better determine exactly why customers are returning.
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** Rob, Editor Dealersedge/WD&S **Help is only a message post away!
robc@dealersedge.com