Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI2005A4 BASE, 4D SEDAN, 3.0 TREPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEIGNITION SWITCH/STEERING LOCKELECTRICAL EQUIPMENT27 BATTERY, STARTER, GENERATOR, CRUISE CONTROLBATTERYBATTERY IN ENGINE COMPARTMENT, DISCONNECTING AND RECONNECTINGNOTES
2005 Audi A4 Base, 4D Sedan, 3.0 T
Battery in engine compartment, disconnecting and reconnecting: Notes
2005 Audi A4 Base, 4D Sedan, 3.0 TSECTION Notes
Should service procedures in this information specify disconnecting and reconnecting the battery, please heed the following CAUTIONS!:
CAUTION:
Before beginning repairs on the electrical system:
- Where applicable, obtain anti-theft radio security code.
- Switch off all electrical consumers.
- Switch the ignition off and remove ignition key.
- Disconnect negative ( - ) battery terminal.
- On vehicles equipped with Audi Telematics by OnStar (R) , switch-off the emergency (back-up) battery for the Telematic/Telephone Control Module prior to disconnecting vehicle battery → 91 - COMMUNICATION
- After reconnecting vehicle battery, re-code and check operation of anti-theft radio. Also check operation of clock and power windows according to Repair Information and/or Owners Manual.
- After reconnecting vehicle battery on vehicles equipped with Audi Telematics by OnStar (R) , switch-on the emergency (back-up) battery for the Telematic/Telephone Control Module → 91 - COMMUNICATION
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.