Second time the car is showing alerts for the collision sensors

Back in early March, I had a weird situation where I started my car and every collision sensor was showing an alarm on the cluster. I restarted the car, which didn't make it go away, but the moment I shifted into D, they all disappeared.

At the time, they were accompanied by the following DTCs: C164286 and C120702. The DTCs were closed a short time later.

Today, I get into my car, and lo and behold:



All the alerts come back. These were accompanied by the following DTCs in Bluelink: C164286 and C121002.

Again, I put the car in D and they all go away. I have a service appointment scheduled for next week, but I have really had nothing but bad experiences at multiple dealers near me being really unhelpful and I suspect I'm going to get a run-around.

Anyone have experience with this issue?