🏷️ Basic Information

Make:

Audi

Model:

A6 S6 RS6

Model Variant Codes:

4B, 4B2, 4B4, 4B5, 4B6, 4BH

Year:

2005

👋 Introduction

Segment:

Luxury Executive Sedan/Wagon (A6), High-Performance Sport Sedan (S6), Ultra-High-Performance Sedan (RS6)

Key Competitors 2005:

BMW 5 Series (E60), Mercedes-Benz E-Class (W211), Lexus GS Series, Jaguar S-Type

Premium Appointments:

High-quality interior materials, advanced technology integration, sophisticated design

Performance Variants:

S6 and RS6 models offer enhanced performance with larger displacement V8 engines, sport-tuned suspensions, and upgraded braking systems

Completeness And Accuracy:

This is the definitive factory service manual, providing the most accurate and comprehensive information for diagnosis, repair, and maintenance.

Diy Vs Professional:

Suitable for both experienced DIY enthusiasts and professional technicians seeking authoritative repair data.

📋 Manual Details

Primary Coverage:

Audi A6, S6, RS6 (2005 model year)

Chassis Codes Covered:

4B, 4B2, 4B4, 4B5, 4B6, 4BH

Total Pages:

16401

Type:

Full Factory Service and Repair Manual

Language:

English

Format:

PDF

Delivery Method:

Instant Download

Print Capability:

Yes, printable in entirety or selected pages

Search Functionality:

Fully searchable text

Operating Systems:

Windows and Mac

Software Requirements:

Adobe PDF Reader and/or WinRar

📖 Manual Coverage

Powertrain:

Mechanical Engine, Transmission, Driveline Axle

Chassis Suspension Steering:

Suspension, Steering, Brakes, Tires & Wheels

Electrical Lighting Accessories:

Electrical, Lights, Accessories & Equipment, Audio, Visual & Telematics

Body Frame Comfort:

Body & Frame - Interior & Exterior, HVAC

Safety Restraints:

Restraints (Airbags, Seatbelts)

Maintenance Procedures:

Scheduled maintenance, fluid changes, filter replacements, inspections

Repair Procedures:

Engine overhaul, transmission repair, brake system service, suspension component replacement, electrical system troubleshooting, body panel repair

Diagnostic Procedures:

Troubleshooting guides for all major systems, diagnostic trouble codes (DTCs), component testing

Wiring Diagrams:

Comprehensive electrical wiring diagrams for all vehicle systems

Depth Of Coverage:

Extensive, covering from basic maintenance to complete mechanical and electrical overhauls. Factory level detail.

📊 Manual Specifications

File Type:

Portable Document Format (PDF)

Print Resolution:

High resolution, suitable for professional printing

Binding Suggestion:

Coil or comb binding recommended for ease of use in workshop environments

Paper Recommendation:

Durable, heavy-weight paper stock (e.g., 20-24 lb bond) for workshop durability

⚙️ Engine Specifications

A6 Engine Options:

2.4L V6 (BDV), 3.0L V6 (ASN), 4.2L V8 (BAT)

S6 Engine Options:

4.2L V8 (BAT) - enhanced version

Rs6 Engine Options:

4.2L V8 Bi-Turbo (BCY)

A6 2.4L V6 Hp:

177 hp @ 6000 rpm

A6 3.0L V6 Hp:

220 hp @ 6300 rpm

A6 4.2L V8 Hp:

335 hp @ 6600 rpm

S6 4.2L V8 Hp:

340 hp @ 6600 rpm

Rs6 4.2L Bi-Turbo Hp:

450 hp @ 5700-6400 rpm

Rs6 4.2L Bi-Turbo Torque:

560 Nm (413 lb-ft) @ 1950-5600 rpm

Fuel Delivery:

Multi-Point Fuel Injection (MPI) for naturally aspirated engines; Sequential Fuel Injection with Twin-Turbochargers for RS6

Recommended Fuel:

Premium Unleaded (91 octane or higher recommended for all variants, particularly V8 and Bi-Turbo)

🔧 Transmission

A6 Gearbox Options:

5-speed Tiptronic automatic (FWD), 6-speed Tiptronic automatic (Quattro)

S6 Gearbox Options:

6-speed Tiptronic automatic (Quattro)

Rs6 Gearbox Options:

5-speed Tiptronic automatic (Quattro) - specifically engineered for high torque

A6 Manual Option:

5-speed manual (FWD), 6-speed manual (Quattro) available on some A6 models

Drivetrain:

Front-Wheel Drive (FWD) and Audi's proprietary quattro permanent all-wheel drive system

Tiptronic Functionality:

Allows manual selection of gears for sportier driving or engine braking

📐 Dimensions

A6 Sedan Length:

Approx. 4916 mm (193.5 in)

A6 Avant Length:

Approx. 4917 mm (193.6 in)

Wheelbase:

Approx. 2883 mm (113.5 in)

Curb Weight Typical A6:

Approx. 1600-1800 kg (3527-3968 lbs), depending on engine and drivetrain

Curb Weight Typical Rs6:

Approx. 1865 kg (4112 lbs)

🛡️ Safety Features

NHTSA Front Impact:

Likely 5-star rating (based on typical Audi safety for the era, specific 2005 ratings may vary by market)

IIHS Side Impact:

Likely "Good" rating (based on typical Audi safety for the era)

Stability Control:

Electronic Stability Program (ESP) standard across models

Braking System:

Anti-lock Braking System (ABS) with Electronic Brake-force Distribution (EBD) and Brake Assist (BA); larger rotors and performance brakes on S6/RS6

Airbags:

Driver and front passenger airbags, side airbags, optional front and rear side curtain airbags

Seatbelts:

Three-point inertia-reel seatbelts with pre-tensioners and force limiters

💡 Technology Features

Audi Mmi System:

The 2005 model may feature the early generation of Audi's Multi Media Interface (MMI) system for navigation, climate control, and audio settings.

Audio Options:

Bose premium sound system optional, CD changer, satellite radio readiness.

Parking Sensors:

Optional front and rear parking sensors (Audi parking system).

Cruise Control:

Standard cruise control, adaptive cruise control (ACC) was not widely available or standard on this model year.

Bluetooth:

Optional Bluetooth hands-free interface available on some trims.

Headlights:

Xenon Plus headlights with automatic leveling and headlight washers were common options, particularly on S6/RS6.

🔧 Maintenance

Oil Change Interval:

Typically every 10,000 miles or 12 months, or as indicated by the vehicle's Flexible Service System (FSS).

Timing Belt Interval:

For the V6 and V8 naturally aspirated engines, timing chains are used, requiring inspection but generally not a scheduled replacement. The RS6's V8 Bi-Turbo also uses timing chains. Consult the manual for specific inspection intervals.

Engine Oil Spec V6:

SAE 5W-40 or 0W-30 Synthetic Oil meeting VW 502 00 or 505 00 specifications

Engine Oil Spec V8 Naturally Aspirated:

SAE 0W-40 or 5W-40 Synthetic Oil meeting VW 502 00 specifications

Engine Oil Spec Rs6 Bi-Turbo:

SAE 0W-40 Synthetic Oil meeting VW 503 01 specifications

Transmission Fluid Automatic:

G 055 025 (Pentosin ATF1 or equivalent for Tiptronic transmissions)

Coolant:

G12 Plus (or G12++) Antifreeze/Coolant, mixed 50/50 with distilled water

Common A6 Issues:

Oil leaks (valve cover gaskets, oil cooler seals), ignition coil failure, mass airflow sensor (MAF) issues, automatic transmission shifting problems (especially on higher mileage units).

Common S6 Rs6 Issues:

Increased potential for oil consumption in high-performance V8s, turbocharger issues on RS6 (intercooler leaks, wastegate problems), timing chain tensioner wear on higher mileage V8s, potential for increased wear on suspension components due to performance driving.

📚 Vehicle History

Audi Legacy:

Audi has a long history of producing premium, technologically advanced automobiles, particularly known for its quattro all-wheel-drive system and innovative engineering.

C5 Generation:

The 4B chassis represents the second generation of the Audi A6, produced from 1997 to 2004, with the 2005 model year often bridging the gap to the C6 generation in some markets or representing late-production C5s with updates.

Introduction Of S6 Rs6:

The S6 and RS6 variants introduced high-performance versions of the A6 platform, targeting enthusiasts who desired potent powertrains and sportier handling characteristics.

Manufacturing Location:

Primarily Neckarsulm, Germany

🏆 Awards & Recognition

Class Awards 2005:

The A6 consistently received accolades for its design, comfort, and technology from automotive publications. Specific awards would vary by market and year.

Consumer Reports Reliability:

Reliability ratings for Audi models of this era can be mixed; thorough maintenance is crucial. The manual provides the key to proper upkeep.

Emissions Standards:

Vehicles conform to prevailing emissions standards for the target markets (e.g., EPA Tier 2 Bin 5 in the US).