Safety Precautions

WARNING: This page is about a different car, the 2009 Audi S8, 2008 Audi S8, and 2007 Audi S8. However, it is still accessible from the selected car via links, so may be relevant.

Note the following when working on the fuel system:

CAUTION: There is a risk of injury because the fuel is under very high pressure.

Before opening high pressure area of the fuel injection system, fuel pressure must be relieved to residual pressure.
To reduce remaining residual pressure, lay a clean cloth around the connector and carefully loosen connector.

Procedures before opening high pressure fuel injection system → Before Opening High Pressure Fuel Injection System .

To prevent personal injury and damage to the injection and ignition system, observe the following:

The ignition must be switched off before connecting or disconnecting the injection and ignition system wiring or tester cables.
Only clean engine with ignition switched off.
If electrical connectors were disconnected, faults are saved in ECM:

Connect Vehicle Diagnosis, Testing and Information System VAS 5051B.
Start "Guided Functions" operating mode.
Generate readiness code in ECM.

CAUTION: Risk of destroying electrical components when battery is disconnected.

Observe measures when disconnecting battery.
Only disconnect battery with ignition switched off.

Disconnect battery → 27 - BATTERY, STARTER, GENERATOR, CRUISE CONTROL .

Note the following when working on the cooling system:

CAUTION: Risk of scalding due to hot steam and hot coolant.

When the engine is warm the cooling system is under pressure.
To reduce pressure, cover coolant reservoir cap with cloth and carefully open.

If it is necessary to use testing and measuring devices on road tests, observe the following:

CAUTION: Distraction and improperly secured test equipment can lead to accidents.

Risk of passenger airbag deploying in an accident.

Operating testing and measuring equipment while driving creates a distraction.
There is an increased risk of injury due to unsecured testing and measuring equipment.
Always secure testers on the rear seat with a strap and have a second person on the rear seat operate them.