HID headlamp bulb, replacing

WARNING: This page does not describe the selected car, but rather 16 other vehicles, including the 2009 Audi S4, 2009 Audi A4, 2008 Audi S4, 2008 Audi RS 4, and 2008 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION:

HIGH VOLTAGE!
Always disconnect negative ( - ) battery terminal prior to working on parts of HID headlamp components marked with yellow "HIGH VOLTAGE" warning symbols.
The physical and mechanical properties of HID bulbs are very sensitive. Internal pressure of HID glass bulb may exceed 100 bar (in operation). Bulb temperature may exceed 700 degrees Celsius.
Danger of explosion and burning.

The control modules for HID lamps must never be operated (headlamps turned on) without an HID lamp.
HID bulbs must only be operated (headlamps turned on) when installed in the headlamp housing.
Always wear safety glasses and gloves when removing and installing HID bulb.
Never look directly at an operating HID bulb. The UV emissions of an HID bulb are approximately 2.5 times that of a comparable halogen bulb..

Removing

Disconnect battery. Audi A4 S4 → Battery in engine compartment, disconnecting and reconnecting . Audi RS4 → Battery in luggage compartment, disconnecting and connecting .

Left headlamp

Remove top section of washer fluid reservoir and power steering reservoir.

Right headlamp - vehicles with 1.8L 4-cylinder Turbo engine:

Preparation.

Right headlamp - vehicles with 2.0L 4-cylinder Turbo FSI engine:

Preparation.

Right headlamp - vehicles with 3.0L 6-cylinder engine

Preparation.

Right headlamp - vehicles with 3.2L 6-cylinder FSI engine

Preparation.

Right headlamp - vehicles with 4.2L 8-cylinder engine (Audi S4)

Preparation.

Right headlamp - vehicles with 4.2L 8-cylinder FSI engine (Audi RS4)

Preparation.

Both sides, continued:

Fig 1: Removing Screws And Cover For Low Beam From Headlamp Housing

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Remove screws - 1 - and - 2 -.
Remove cover for low beam from headlamp housing - arrow -.

Fig 2: Identifying Retainers, Electrical Connection, Retaining Clips, And HID Headlamp Bulb

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Remove electrical wire from retainers - arrow -.
Disconnect electrical connection - 4 -.
Release retaining clips - 1 - and - 3 - and remove HID headlamp bulb - 2 - from housing.

Faulty HID headlamp bulb disposal → HID headlamp bulb, disposal

Installing

Install in reverse order of removal, noting the following:

CAUTION:

Do not touch glass portion of bulb with bare hands. Even the smallest amount of moisture and/or contaminants from fingers that evaporates on the bulb during operation can cause the glass to cloud over.
When installing housing cover, ensure proper seating. Water intrusion will damage headlamp.

Insert new HID headlamp bulb in housing.

NOTE:

Note installation position: the electrical connection must always point downwards.
Secure HID headlamp bulb with retaining clips.
Reconnect battery. Required steps Audi A4 S4 Reconnecting . Required steps Audi RS4

Tightening torque

Component	Nm
Housing cover for low beam to headlamp housing	1.5