Safety precautions

WARNING: This page is about a different car, the 2009 Audi A4, 2008 Audi A4, 2007 Audi A4, 2006 Audi A4, and 2005 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION:

Test and measuring equipment must always be secured to the rear seat and be operated from there by a second person.
If test and measuring instruments are operated from the front passengers seat and the vehicle is involved in an accident, there is a possibility that the person sitting in this seat may receive serious injuries when the airbag is triggered.

To reduce the risk of personal injury and/or damage to the fuel injection and ignition system, always observe the following:

Do not touch or remove ignition wires when engine is running or turning at starter speed.
Always switch ignition off before disconnecting or reconnecting wires for the ignition system, including high voltage wiring and test leads.
If engine is to be cranked at starting RPM without starting (e.g. for compression testing), disconnect connectors from ignition coils and from fuel injectors. After performing work, check and erase DTC memory.
Cleaning the engine should only be performed with ignition switched off.

The battery must only be disconnected and connected with the ignition switched off, since the Engine Control Module (ECM) can otherwise be damaged.