🏷️ Basic Information

Make:

Audi

Model:

A6 C5 S6 RS6 & Allroad Quattro

Model Year:

2004

Generation Code:

C5 (Second Generation)

Chassis Code:

Typ 4B

👋 Introduction

Target Audience:

Audi A6 C5 owners, DIY mechanics, independent repair shops

Differentiation:

Comprehensive coverage of all variants (S6, RS6, Allroad), simple PDF format, instant download, no extra software required, extensive page count.

Features:

Instant download, PDF format, comprehensive system coverage, dealer-level detail, all variants included, user-friendly bookmarking.

📋 Manual Details

Vehicle Variants:

All variations including S6, RS6, Allroad Quattro, Avant

Engine Variants:

All engine types including Petrol, Diesel, and Hybrid (Note: Hybrid coverage for this generation is likely referring to advanced TDI or early concepts, not modern hybrid powertrains)

Total Pages:

Approximately 10,000

Type:

Workshop Service and Repair Manual

Language:

English (Implied by product description style)

Format:

PDF

📖 Manual Coverage

Powertrain:

Engine System, Fuel Charging and Controls, Accessory Drive, Engine Ignition, Engine Emission Control, Intake Air Distribution, Emissions, Electronic Engine Controls, Manual Transmission, Clutch Controls, Exhaust System, Fuel System, Acceleration Control, Speed Control

Chassis:

Suspension, Wheels and Tyres, Driveline System, Driveshaft, Bearings, Brake System, Anti-Lock Control, Steering System

Electrical:

Wiring Manual, Battery and Charging System, Information and Entertainment Systems, Lighting, Electrical Distribution, Electronic Feature Group

Body:

Body System, Body Panels, Interior Trim, Mirrors, Seating, Glass, Frames and Mechanisms, Instrument Panel and Console, Wipers and Washers, Roof, Bumpers, Safety Belt System, Body Repairs, Metal Repairs, Subframe and Mounting System

Comfort:

Climate Control System, Air Distribution, Control Components

Instrumentation:

Instrument and Warning Systems

Maintenance:

Full maintenance manual, service information, routine maintenance tasks

Repair:

Full workshop manual, repair procedures for all systems

Diagnostics:

Troubleshooting guides, diagnostic procedures (implied by dealer-level style)

Technical Data:

Specifications, fluid types, capacities, torque values (implied)

Wiring:

Full wiring manual, electrical schematics

Identification:

Identification codes for vehicle and components

Jacking Lifting:

Jacking and Lifting procedures

Depth:

Dealer-level factory manual standard, covering all elements of service and repair.

📊 Manual Specifications

Format:

PDF

Searchability:

Searchable text (implied by PDF format and bookmarks)

Compatibility:

PC, Mac, Smartphone, Tablet

Quality:

High (implied by dealer-level factory manual style)

Binding:

N/A (Digital Download)

Paper Type:

N/A (Digital Download)

Bookmarking:

Fully bookmarked for ease of use

⚙️ Engine Specifications

Engine Family:

Audi EA824/EA825 (V8 for S6/RS6), EA113/EA827/EA830/EA831/EA836 (various I4 and V6 petrol), EA827/EA830 (various TDI diesel). Specific engines vary by model and market.

Typical Power Output:

Varies greatly. Standard A6 models (2.4L V6) around 165-177 hp. S6 (4.2L V8) around 340 hp. RS6 (4.2L Bi-Turbo V8) around 450 hp. Diesel engines (e.g., 2.5 TDI, 2.7 TDI) range from 150-180 hp.

Typical Torque Output:

Varies greatly. S6 (4.2L V8) around 410 Nm. RS6 (4.2L Bi-Turbo V8) around 560 Nm. Diesel engines typically 370-400 Nm.

Injection Type:

Multi-point fuel injection (MPI) or Gasoline Direct Injection (GDI) for petrol engines, Common Rail Direct Injection (CDI) for TDI diesel engines.

Systems:

Catalytic converters, secondary air injection, EGR (Exhaust Gas Recirculation), evaporative emission control (EVAP), secondary oxygen sensors (post-catalyst).

🔧 Transmission

Transmission Type:

5-speed manual, 6-speed manual (RS6), 5-speed Tiptronic automatic, 6-speed Tiptronic automatic (RS6).

Transmission Type:

Continuously Variable Transmission (CVT) - Multitronic (on some front-wheel drive models).

Drivetrain:

Quattro permanent all-wheel drive system (standard on S6, RS6, Allroad, and many A6 variants).

Automatic Transmission Fluid:

Typically G 052 162 A1/A2/A6 or equivalent Pentosin ATF 1/3 (Check specific model for exact type).

Manual Transmission Fluid:

Typically G 052 171 A1/A2 or G 052 512 A2 (Check specific model for exact type).

📐 Dimensions

Length:

A6 Sedan: Approx. 4800-4880 mm, A6 Avant: Approx. 4790-4880 mm, Allroad: Approx. 4850 mm.

Width:

A6/S6/RS6: Approx. 1810-1820 mm, Allroad: Approx. 1870 mm.

Height:

A6/S6/RS6: Approx. 1440-1450 mm, Allroad: Approx. 1460-1490 mm (adjustable).

Curb Weight:

Varies significantly by engine and body style, typically 1600 kg to 1900 kg.

Gross Vehicle Weight Rating:

Typically around 2200-2400 kg.

🛡️ Safety Features

Euro Ncap Rating:

Likely 4 or 5 stars for front and side impact (for early C5 models, specific ratings for 2004 might vary).

Braking Systems:

ABS (Anti-lock Braking System), EBD (Electronic Brake-force Distribution), Brake Assist (BAS).

Traction Control:

ASR (Anti-Slip Regulation) / Traction Control System (TCS).

Stability Control:

ESP (Electronic Stability Program) was available on many models.

Airbags:

Front airbags, side airbags, optional curtain airbags.

Seatbelts:

Pretensioning seatbelts with force limiters.

Child Anchors:

ISOFIX child seat mounting points.

💡 Technology Features

Audio System:

Optional Audi Symphony or Concert radio systems, often with CD player, cassette player (early models), and available navigation systems (MMI was not common on the C5 platform).

Display Technology:

Central display for infotainment, climate, and vehicle status. Monochrome or color displays depending on trim and options.

Parking Assistance:

Optional parking sensors (front and rear).

Phone Integration:

Optional Bluetooth hands-free system (often an accessory add-on).

Headlights:

Halogen or optional Xenon HID headlights with automatic leveling.

🔧 Maintenance

Oil Change Interval:

Typically 15,000 km or 1 year, whichever comes first (or variable service intervals based on oil quality sensor and driving conditions, usually denoted by the 'oil can' light on the dashboard).

Timing Belt Interval:

For engines that use a timing belt (e.g., some V6 engines), typically every 90,000 km or 5 years. Engines with timing chains generally do not have a scheduled replacement interval.

Engine Oil:

Various specifications depending on engine type, commonly VW 502 00 or VW 504 00 for petrol, and VW 505 00 or VW 507 00 for diesel. Viscosity typically 5W-40 or 0W-40. (Crucial to verify specific engine requirement).

Coolant:

G 12 (pink) or G 12 Plus (red/purple) ethylene glycol-based coolant. Mixture of 50/50 coolant and distilled water.

Brake Fluid:

DOT 4 or DOT 4 Plus.

Common Problems:

Ignition coil failure, mass airflow sensor (MAF) issues, crankcase ventilation system (PCV) problems, coolant flange leaks (especially on V6 engines), ABS/ESP sensor failures, window regulator failures, CV joint wear, transmission control module (TCM) issues on automatic transmissions.

Allroad Specific Issues:

Air suspension compressor failures, air spring leaks, ride height sensor issues, differential lock solenoids.

Oil Filter Part Numbers:

Examples: Mann-Filter W920/2, Mahle OC 51/1, Bosch 0 986 452 044 (Varies by engine; cross-reference is essential).

📚 Vehicle History

Brand Focus:

Audi is renowned for its 'Vorsprung durch Technik' slogan, emphasizing technological advancement and engineering excellence, particularly in quattro all-wheel drive systems and luxury vehicle segments.

C5 Generation Introduction:

The C5 generation Audi A6 was introduced in 1997, replacing the C4. It was a significant step forward in design, technology, and refinement.

S6 Rs6 Introduction:

The S6 and RS6 variants provided high-performance options, with the RS6 being a limited-production, ultra-performance model that cemented Audi's reputation in the performance sedan market.

Allroad Quattro Introduction:

The Allroad Quattro variant, introduced in 2000, was a crossover model based on the A6 Avant, featuring increased ride height, protective cladding, and all-wheel drive as standard, catering to a more adventurous market.

Production Years C5:

1997-2004 (sedan/avant), 2000-2005 (allroad).

Manufacturing Locations:

Primary assembly in Neckarsulm, Germany.

🏆 Awards & Recognition

Car Of The Year:

While the C5 A6 itself may not have won major 'Car of the Year' awards globally, it consistently received accolades for its design, quality, and refinement, contributing to Audi's brand image.

Segment Awards:

Often praised for its interior quality, ride comfort, and advanced quattro system, frequently ranking highly among its luxury sedan and wagon competitors in automotive media reviews.