Audi A4: Telephone System

 Emissions control system

General information WARNING The temperature of the exhaust system is high, both when driving and after stopping the engine. Never touch the exhaust tail pipes once they have become hot. This could result in burns. Do not park your vehicle over flammable materials such as grass or leaves because

 Finding Leaks via Vacuum Test using A/C Service Station or Nitrogen Pressure Testing

Vehicles with a High Voltage System (Hybrid Vehicles) Read and follow all of the supplemental warnings for all work performed on vehicles with the high voltage system. Refer to → Chapter "Warnings when Working on Vehicles with High Voltage System" and → Electrical Equipment;