Engine Management, Exhaust and Engine Electrical

30 Clutch 32 Torque Converter34 Manual Transmission

37 Automatic Transmission39 Final Drive, Driveshaft

Clutch and Transmission

40 Front Suspension42 Rear Suspension44 Wheels, Tires, Alignment45 Antilock Brakes (ABS)

46 Brakes–Mechanical47 Brakes–Hydraulic48 Steering

Suspension, Brakes and Steering

50 Body–Front55 Hood and Lids

57 Doors and LocksBody –Assembly

60 Sunroof63 Bumpers64 Door Windows

66 Body–Exterior Equipment69 Seat Belts, Airbags

Body –Components and Accessories

Body –Interior Trim

9 Electrical System–General90 Instruments91 Radio and Communication92 Wipers and Washers

94 Exterior Lights96 Interior Lights, Switches, Anti-theft97 Fuses, Relays,

Component Locations

Electrical System

1 Engine

6

2345

7

9

General Information, Maintenance

87 Heating and Air-conditioningHeating and Air-conditioning8

WARNING–Important Safety Notice...................................................................... iiForeword .............................................................................................................. ivIndex .................................................................................................... rear of book

20 Fuel Storage and Supply21 Turbocharger and Intercooler24 Fuel Injection

26 Exhaust System27 Battery, Alternator, Starter28 Ignition System

13 Timing Belt, Engine Pulley, Rear Main Seal

15 Cylinder Head Cover

17 Engine–Lubrication System19 Engine–Cooling System

00 Warnings and Cautions01 Vehicle Identification

and VIN Decoder

02 Product Familiarization03 Maintenance0

70 Interior Trim72 Seats

Electrical Wiring DiagramsOn Board Diagnostics

EWDOBD

A604_fro.fm Page 3 Wednesday, December 2, 2009 11:54 AM

3

established 1950Automotive Reference™

Bentley Publishers, 1734 Massachusetts Avenue, Cambridge, MA 02138-1804 USATel: 617-547-4170 • Toll Free: 800-423-4595 • Fax: 617-876-9235http://www.bentleypublishers.com/contact-sales

Audi A6Service Manual: 1998-2004includes A6, allroad quattro, S6, RS6

Price: $99.95Bentley Stock Number: A604Publication Date: 2006.oct.13ISBN-10: 0-8376-1499-6ISBN-13: 978-0-8376-1499-1Audi of America Lit. No. W42 AUDIA69804SMSoftcover, 8 3/8 in. x 11 in.Case quantity: 5964 pages, 1772 photos, illustrations and diagramsIncludes a 32 page color Audi A6 Familiarization sectionBentley Publishers is proud to announce the publication of the

Audi A6 Service Manual: 1998–2004. This repair manual covers the 1998 through 2004 model year A6 and S6 models built on the Audi “C5” platform.

The do-it-yourself Audi owner will find this manual indispensable as a source of detailed maintenance and repair information. Even if you have no intention of working on your car, you will find that reading and owning this manual makes it possible to discuss repairs more intelligently with a professional technician.

Features:• Maintenance procedures from changing the oil to replacing the dust and pollen filter. This manual tells you what to do and how and

when to do it.• Step-by-step engine timing belt service.• Cylinder head cover and crankshaft seal replacement.• Cooling system filling and bleeding, coolant pump replacement and engine cooling fan and radiator service.• Fuel injection and ignition system diagrams and explanations, including three different Bosch Motronic engine management systems.• Clutch, flywheel and rear main seal service.• Suspension component replacement, including front struts, rear

shocks, coil springs, wheel bearings and wheels.• Multi-link front suspension repair procedures, including stabilizer

bar link, control arm and axle boot replacement.• Brakes, steering and ABS maintenance, troubleshooting, and repair.• Heating and air-conditioning repair, including A/C component replacement.• Body, hood and sunroof repairs and adjustments.• Electrical system service, with an easy-to-use illustrated component locator section.• Wiring schematics for selected models, including power distribution and grounds.

Bentley repair manuals provide the highest level of clarity and comprehensiveness for service and repair procedures. If you’re looking for better understanding of your C5 platform Audi A6 or S6, look no further than Bentley.

Engines covered:

• 1998 - 2001 2.8 liter V6 (AHA, ATQ)• 1999 - 2004 4.2 liter V8 (ART, AWN, BBD)• 2000 - 2004 2.7 liter V6 biturbo (APB, BEL)• 2002 - 2004 3.0 liter V6 (AVK)• 2003 - 2004 4.2 liter V8 (BAS)• 2003 - 2004 4.2 liter V8 biturbo (BCY)

Transmissions covered:

• 5-speed manual AWD (01A)• 6-speed manual AWD (01E)• 5-speed automatic AWD (1L)• 5-speed automatic FWD or AWD (1V)• Continuously variable transmission (CVT) FWD (01J)

Bentley technical editorsphotographing axle bootreplacement.

Step-by-step frontsuspension componentreplacement.40 Front Suspension

BentleyPublishers.com