2010 Cadillac STS Questions

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When I turn off my engine my car kept on beeping. It be saying that it need to shift to park and it already be in park.

I purchased a 2010 STS in Oct,2015. Nice car. But I noticed that when one closed the rear door, either left or right, you get that solid "thump" sound.
But when you close either front doors, there's a different sound in comparison to the rear doors.
The sound of the front doors sounds like a type of rattling noise. Before I bought the car, I checked Car Fax and found out it had been in two accidents.When confronted, the dealership told me that everything was checked thoroughly with the car. I even took the car back during the initial warranty period to see about those doors. Do I need to have the car doors re-aligned and how much would that costs?

I thought the battery was dead since it had not been driven for 10 days.

I took my cadillic to emmssion and the the guy said it did not read they told me I need to find what is the specific drive cycle for the computer to read