Rewrite reality for the first time.
Story related, can't be missed.
Act 1: The Mechanic
After investigating the garage and talking to Emma, you will be tasked with finding the 3 objects. They are all easy to find since indicated on your mini map. Once you obtain them and talk to Emma again, you must go "rewrite reality". Go to the spot on the map and put the CD in the boombox, valve in front of the oil (turn the valve) and then the battery in the switch (turn on switch)