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 MANUALSAUDI1998A8 SEDAN (4D2) V8-3.7L (AEW)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTSERVICE PRECAUTIONSVEHICLE DAMAGE WARNINGSELECTRICAL PRECAUTIONSBATTERY PRECAUTIONS
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)
Battery Precautions
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)SECTION Battery Precautions
1. Never use a booster/starter which has a voltage rating above 12 volts to start engine.
2. Always ensure the battery is properly connected to the vehicle prior to attempting to start engine.
3. Don't disconnect the battery when the engine is running.
4. When charging a battery, be sure battery cables are disconnected.
5. The battery contains acid and produces explosive gas (hydrogen). Avoid creating sparks near battery.
CAUTION!
BEFORE disconnecting the battery:
^ Stop the engine.
^ Be sure the ignition is switched OFF (also applles when connecting the battery). Failure to do so may damage the Engine Control Module (ECM).
^ Be sure of the proper radio code (for vehicles equipped with coded anti-theft radio).
Be sure the battery negative (-) cable is disconnected, when:
^ Working on the electrical system
^ Resistance (spot) welding or electric arc welding anywhere on the vehicle.
When connecting and disconnecting electrical test equipment (LED voltage tester, multimeter, etc.):
^ Be sure the ignition is switched OFF.
^ Use correct adapters from the VW 1594 connector test kit.
For any work affecting the Engine Control Module (ECM):
^ BEFORE disconnecting the ECM harness connector, switch the ignition OFF and WAIT at least 20 seconds. Failure to do so may damage the ECM.
^ DO NOT connect any outside voltage source to stimulate an output signal at the ECM.
2. Always ensure the battery is properly connected to the vehicle prior to attempting to start engine.
3. Don't disconnect the battery when the engine is running.
4. When charging a battery, be sure battery cables are disconnected.
5. The battery contains acid and produces explosive gas (hydrogen). Avoid creating sparks near battery.
CAUTION!
BEFORE disconnecting the battery:
^ Stop the engine.
^ Be sure the ignition is switched OFF (also applles when connecting the battery). Failure to do so may damage the Engine Control Module (ECM).
^ Be sure of the proper radio code (for vehicles equipped with coded anti-theft radio).
Be sure the battery negative (-) cable is disconnected, when:
^ Working on the electrical system
^ Resistance (spot) welding or electric arc welding anywhere on the vehicle.
When connecting and disconnecting electrical test equipment (LED voltage tester, multimeter, etc.):
^ Be sure the ignition is switched OFF.
^ Use correct adapters from the VW 1594 connector test kit.
For any work affecting the Engine Control Module (ECM):
^ BEFORE disconnecting the ECM harness connector, switch the ignition OFF and WAIT at least 20 seconds. Failure to do so may damage the ECM.
^ DO NOT connect any outside voltage source to stimulate an output signal at the ECM.
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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.