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.
Safety precautions
2004 Audi A8SECTION Safety precautions
To prevent injuries to persons and/or damage to the fuel injection and ignition system, the following must be noted:
- Do not touch or disconnect ignition wiring when the engine is running or being turned at starter speed.
- Always switch off the ignition before connecting or disconnecting the battery, otherwise the engine control module may be damaged.
- The ignition must be switched off before connecting or disconnecting injection or ignition system wiring or tester cables.
- In order to run the engine at starting speed without actually starting it (e.g. to test compression), unplug the connectors from the output stages of the ignition coils and from all the injectors. After completing the work, check and erase the DTC memory.
- The ignition must always be switched off when cleaning the engine.
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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.