Audi A4 Owners & Service Manuals

Audi A4: Keys

Key set

Opening and closing
Fig. 26 Your vehicle key set

  1. Vehicle key

You can unlock and lock your vehicle with the vehicle key.

  1. Mechanical key and release buttons for the mechanical key

A mechanical key is integrated in the vehicle key.

To remove it, press the release button and remove the mechanical key.

Using the mechanical key, you can:

  • Applies to: vehicles with lockable glove compartment: locking/unlocking the glove compartment.
  • Manually unlock and lock the doors.
  • Applies to: sedan with locking backrests: Locking and unlocking the backrest.
  • Unlock the luggage compartment lid using the emergency release.
  1. PANIC button

In an emergency, you can press the PANIC button to trigger a visible and audible vehicle alarm. You can do this ass long as you are near your vehicle (within the range for the remote control key).

  • To trigger the alarm, press the [PANIC] button (3) > fig. 26.
  • To turn the alarm off, press the [PANIC] button again.

Lost key/replacing a key

If a vehicle key is Lost, contact an authorized Audi dealer or authorized Audi Service Facility. Have this vehicle key deactivated. It is important to bring all keys with you.

If a key is lost, you should report it to your insurance company.

Electronic immobilizer

The immobilizer prevents unauthorized use of the vehicle.

In some cases, it may not be possible to establish vehicle drive ready mode if there is also a vehicle key from a different vehicle manufacturer on the key chain.

Data in the vehicle key

When driving, service and maintenance-relevant data is continuously stored in your vehicle key. An authorized Audi dealer or authorized Audi Service Facility can read out this data and tell you about the work your vehicle needs.


Observe the safety precautions.


Protect the key against high temperatures and direct sunlight.

For the sake of the environment

Batteries and electrical/electronic devices must be disposed of in an environmentally safe manner.


  • The vehicle key function can be temporarily disrupted by interference from transmitters near the vehicle working in the same frequency range (such as a mobile device or radio equipment). Always check if your vehicle is locked.
  • Applies to MMI: You can view the number of keys programmed to the vehicle by selecting on the home screen: VEHICLE > Settings & Service > Vehicle information.
  • The key set is equipped with a key tag at the factory. The key tag does not directly control any vehicle functions. You can use the key tag if you would like to order a new vehicle key.
  • The system complies with United States FCC regulations and ISED regulations.


     Unlocking and locking the vehicle

    Fig. 27 Door handle: sensor for locking Depending on the vehicle equipment, you may have various options for unlocking and locking your vehicle. The settings in the MMI specify which doors will unloc

     Luggage compartment lid

    General information WARNING Applies to: vehicles with anti-theft alarm system: When the vehicle is locked from the outside, no one, especially children, should remain in the vehicle, because the

     Automatic luggage compartment lid

    Applies to: vehicles with automatic luggage compartment lid Fig. 32 Luggage compartment lid: 1 closing button*, 2 lock button* (vehicles with convenience key*) The luggage compartment lid can be open


     Overview - Drive Axle

    1 - Cap Carefully drive off using a drift Replace if damaged Adhesive surface must be free of oil and grease Coat the sealing surface with Sealant -D 454 300 A2- before installing on CV joint. 2 - Circlip Replace after removing Insert in shaft groove 3 - In

     Instrument Panel

    Overview - Instrument Panel 1 - Screw/Expanding Clip 1.5 Nm 2 - Light Switch Trim Removing and installing. Refer to → Chapter "Light Switch Trim, Removing and Installing". Press on until it engages audibly 3 - Bolts 3 Nm Quantity: 2 4 - Dri

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