Some everyday fixes need a computer step most people might skip:

• New windshield: The camera behind your rearview mirror runs lane assist and automatic emergency braking. New glass can knock it a hair off. AAA found recalibration averaged $360, so make sure it’s in your quote.
• New battery: Many BMW, Audi and VW models need the battery “registered” with the car’s computer. Skip it, and the car can overcharge the new one and shorten its life.

Your car remembers you. Pair your phone, and it can store your contacts, call logs and favorite addresses. Wipe the memory before the vehicle leaves your hands.

• Selling or trading in: Look for a factory reset or “delete personal data” option in the infotainment settings.
• Returning a rental: Delete your phone from the Bluetooth list.