Audi A4 Owners & Service Manuals

Audi A4: General, Technical data

Safety Precautions

Safety Precautions when Working on Vehicles with Start/Stop System

There is a risk of injury due to the engine starting unexpectedly.

The engine can start unexpectedly on vehicles with an activated Start/Stop System. A message in the instrument cluster indicates whether the Start/Stop System is activated.

- Deactivate the Start/Stop System: Switch off the ignition.

Safety Precautions during Road Test with Testing Equipment

There is a risk of injury caused by unsecured testing equipment.

If the front passenger airbag deploys during an accident, unsecured testing equipment becomes a dangerous projectile.

- Secure the testing equipment on the rear seat.


- Have a second technician operate the testing equipment on the rear seat.

Safety Precautions when Working on Cooling System

Risk of scalding due to hot coolant.

The cooling system is under pressure when the engine is warm. Risk of scalding due to hot steam and hot coolant.

- Wear safety gloves.

- Wear protective eyewear.

- Reduce the pressure by covering the coolant expansion tank cap with a cloth and carefully opening it.

Repair Information

Line Routing and Securing

When loosening or removing and installing hydraulic, pneumatic lines or wires, draw sketches or take pictures. This will ensure they are installed in their original positions.

Contact Corrosion

Contact corrosion can occur if incorrect fasteners (bolts, nuts, washers, etc.) are used.

For this reason, only fasteners with a special surface coating are installed.

In addition, rubber or plastic parts and adhesives are made of non-conductive materials.

If there are doubts whether parts can be reused, use new parts according to the Parts Catalog.


  • The use of original replacement parts is recommended, since they are tested and are compatible with aluminum.
  • The use of Audi accessories is recommended.
  • Contact corrosion damage is not covered under warranty!

Adhesive Surfaces for Adhesive Tape

  • The vehicle must be at room temperature before installing self-adhesive covers, door seals, etc. with adhesive tape, for example.
  • The adhesive surfaces on the body must be free of dust and grease.
  • Clean the adhesive surfaces using Cleaning Solution -D 009 401 04-.
  • Apply Bonding Agent -D 355 205 A2- on the body-side adhesive surfaces using the Applicator -D 009 500 25- and let dry.
  • Warm the adhesive surfaces to approximately 40 ºC (104 ºF) using a hot air blower.
  • After installing, press on the covers with adhesive tape again using a roller.
  • After installing, pull on the components by hand to check for a secure fit.

Secured Threaded Connections

Installed bolts that are "microencapsulated" must be replaced, and the threaded holes must be cleaned with a suitable thread tap.


     Body Front

     Lock Carrier

    Overview - Lock Carrier 1 - Impact Member 2 - Air Duct Clipped into the bumper cover bracket 3 - Bolt 8 Nm 4 - Lower Air Guide For the radiator 5 -&

     Bumper Cover Bracket, Removing and Installing

    Follow the safety precautions. Refer to → Body Interior; Rep. Gr.00; Safety Precautions; Safety Precautions when Working on Pyrotechnic Components. Removing - Remove the impa


     Seat Belts, Checking

      WARNING The seat belt system must be inspected systematically after every accident. If damage is determined at any inspection point, the customer must be informed that it is necessary to replace the seat belt. Inspection Points Check the seat belt webbing. Refer to → Chapter "S

     Traffic light information

    Description Applies to: vehicles with traffic light information Fig. 105 Instrument cluster: traffic light information display The traffic light information gives you a speed recommendation in order to reach the next traffic light when it is green (1), or it informs you of the wait time at the ne

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