In the 2017 Audi A4, the 12-volt battery is located in the trunk, on the left side behind trim, under the luggage-floor panel. Access is gained by lifting the floor panel and removing a protective cover.
Location and what to expect
The A4 uses a standard 12-volt battery for the vehicle’s electrical system and start-stop function. In most markets, Audi places this battery in the luggage compartment rather than in the engine bay to save space and keep weight low. Look for a protective cover on the left-hand side of the trunk, under the removable floor panel.
How to access the battery
These steps guide you to reach the battery for inspection, jump-start, or replacement.
- Ensure the ignition is off and the parking brake is engaged.
- Open the trunk and lift the luggage-floor panel to expose the left side of the trunk floor.
- Remove the battery cover to reveal the 12-volt battery terminals.
- When replacing or jump-starting, disconnect the negative terminal first, then the positive terminal, and finally undo the battery hold-down to remove the battery.
Concluding: After completing any maintenance, re-secure the battery, reinstall the protective cover and floor panel, and ensure all trims are fastened properly before closing the trunk.
Safety notes and market variations
If your 2017 A4 has a different trim or is from a different market, the battery location can vary. Some configurations may place a 12V battery in the engine bay, but the trunk placement on the left side is standard for the common 2017 A4 B9 models. Always consult the owner’s manual or a qualified technician if you’re unsure.
Summary: For the 2017 Audi A4, the 12-volt battery is typically located in the trunk on the left side behind trim, under the floor panel. Access is via the trunk floor panel and a removable battery cover, with standard safety steps for removal or replacement.