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12v battery in the front of the vehicle. When this thing starts going, you get codes and errors like the world is ending.
I have a 2017 I got in May, and the 12v battery was the first thing I had replaced a week later. There were NO issues for me to do this, just did a CRAPLOAD of research and video watching before I made my purchase. Original 12v battery was in the car.
So, you have a 2018 model which puts your 12v battery at most (maybe) 6 months older than vehicle manufacture date. Would start with the 12v battery. You can try to get it out to see the MFR date. New costs $130 ish. Dealer can install for $380. I had the dealer put mine in this go around as a one time thing since I just bought the car, and it's not routine like an oil change.
I don't know how to replace brake fluid, but I think I can change my Rex oil and add coolant.
I don't want to break anything either. Lol.
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