Took my car there to have the check engine light a...

Took my car there to have the check engine light assessed and underlying issue corrected. Multiple trips back to the dealership took place because the check engine light continued to come on. It felt like they were guessing at the cause, not confident all the work that was done was needed. This was my first time there for service, I will not be a repeat customer. The service advisor was nice to work with, but it is frustrating that each time I went there and told it was fixed end up with it not and a new issue supposedly causing the light to be in.