Collision warning system malfunction

[ana_tag]

I've had my Kia telluride since May 2019. I recently brought the vehicle into the dealership on March 10th. Had a multi point inspection and nothing was wrong. In 6 years of having the vehicle I've never had any issues with the computer or censors. Within a week of my recall appointment on the emergency brake system my O2 censor failed and my collision warning system is not working. I feel like this is related to what the dealership did and the say it's not. The only issue prior to this was my rear climate control turns on anytime I stay the vehicle and it can be -2 degrees out and the air conditioning will still come on. In Summer 2023 I had to get my engine refurbished because it was consuming all the oil every 1000 miles or less. Has anyone had any issues with the collision warning system and what was the possible cause/solution?