I selected this repair shop because it was listed as a Costco Auto Program participating service center, and I trusted that Costco had done its due diligence in selecting reputable repair facilities. The initial experience was positive. The reception process was professional and well organized, similar to what I would expect at a dealership service department. The service advisor clearly communicated the estimated repair cost and expected completion time. I also appreciated their offer of a complimentary ride home so I would not have to wait at the shop. The repair itself was a relatively straightforward alternator replacement, which I had explained during vehicle drop-off. However, the work took longer than the original completion estimate. The much bigger issue occurred after I picked up the vehicle. I paid the invoice and was driving home when the car suddenly lost all electrical power while traveling through heavy traffic just past a major intersection. The vehicle completely shut down, including the transmission controls, leaving me stranded in a dangerous situation with traffic approaching from behind. Fortunately, several good Samaritans helped push the vehicle safely to the side of the road. To the shop's credit, they responded promptly to my call and immediately dispatched a tow truck. While waiting for the tow truck, I opened the hood to look for anything obviously wrong. I was shocked to discover that the positive battery cable had become completely disconnected from the battery terminal. Upon closer inspection, it appeared that the fasteners securing the cable had not been properly tightened after the repair. I reconnected the cable and tightened it as much as I could by hand, and the car started immediately without any issues. I called the shop to cancel the tow truck, but it had already arrived. The driver did not have a wrench available but was able to further tighten the connection by hand, which allowed me to drive home. Once home, I properly tightened the connection myself with my own tools. It has now been over a week, and the vehicle has been operating normally. In addition to the loose battery connection, I noticed several quality-control issues after the repair: • The driver's seat cushion was left out of position. • There were greasy marks near the driver's entry area. • The interior fuse box cover was left loose. While the alternator replacement appears to be functioning correctly, a loose battery connection is a serious oversight that could have resulted in an accident. The situation was especially concerning because the vehicle lost power in active traffic shortly after leaving the shop. I am giving 2 stars instead of 1 because the service advisor was professional, the customer service response after the breakdown was prompt, and the repair itself appears to be working properly so far. However, the lack of attention to detail and post-repair quality checks significantly undermined my confidence in the workmanship.