🏷️ Basic Information

Make:

Audi

Model:

A8 / S8

Year:

1999

Model Code:

D2

Engine Codes Typical:

AEB, AWM (2.8L V6); ACK, ALG, AML, APB, ART, ASG (2.8L V6, 30v); AWE, AWD, AXB, AXC (4.2L V8, 32v); AHE, AQD, ARS, ASG (4.2L V8, 32v); AUW, AVN, AYS, BBD (4.2L V8, 40v); AZB, AZC (4.2L V8, 40v); BCY, BGH, BGM (4.2L V8, 40v); AQH, AQJ (4.0L V8 Bi-Turbo S8)

Chassis Codes Typical:

4D2 (A8), 4D8 (S8)

👋 Introduction

Market Position:

High-end luxury sedan and performance sedan, targeting affluent consumers and performance enthusiasts.

Competitive Analysis:

Competed directly with other flagship luxury sedans from Mercedes-Benz (S-Class), BMW (7 Series), Lexus (LS), and Jaguar (XJ).

Key Features:

Advanced all-wheel drive (quattro), sophisticated suspension systems (Torsen differential, adaptive air suspension), powerful V8 engines, luxurious interiors, cutting-edge technology for its era.

Key Features Additional:

Audi Space Frame (ASF) aluminum chassis construction for enhanced rigidity and weight reduction, dual-pane acoustic glass for improved cabin quietness.

📋 Manual Details

Coverage Areas:

Full Service, Repair, Troubleshooting, Diagnostics, Maintenance, Wiring Schematics, Specifications, Diagrams, Illustrations

Page Count:

Not specified, but implied to be comprehensive

Manual Type:

Service Repair Workshop Manual

Language:

English

Format:

PDF

Compatibility:

All Versions of Windows AND Mac

Printability:

Yes, all pages are printable

Requirements:

Adobe PDF Reader

Source Type:

Manufacturer-produced service manual

📖 Manual Coverage

Systems Covered:

General Information, Engine Mechanical, Engine Electrical, Emission Control, Fuel System, Clutch System, Manual Transaxle, Automatic Transaxle, Driveshaft and Axle, Suspension System, Steering System, Restraint System, Brake System, Body (Interior and Exterior), Body Electrical System, Heating, Ventilation, Air Conditioning (HVAC)

Systems Covered Additional:

Air suspension system (optional on A8), hydraulic systems, chassis components, interior trim and upholstery, exterior body panels and trim.

Procedures Included:

Step-by-step repair instructions, diagnostic procedures, maintenance schedules, troubleshooting guides, component replacement, adjustments, system checks, wiring repairs, fluid changes

Procedures Included Additional:

Troubleshooting electrical circuits, diagnosing drivability issues, wheel alignment specifications, tire pressure recommendations, torque specifications for critical fasteners.

Technical Depth:

Detailed diagnostic procedures, complete overhaul instructions, component-level repair, electrical system tracing, technical specifications for all major systems

Technical Depth Additional:

Diagnostic trouble codes (DTCs) and their interpretations, electrical system schematics for all major circuits, component testing procedures.

📊 Manual Specifications

File Format:

PDF

Print Quality:

Printable from PDF, allowing for high-quality reproduction of diagrams and text

Binding Type:

Digital (PDF), printable

Paper Type:

N/A (digital format), but printable on standard paper

⚙️ Engine Specifications

Primary Engine:

4.2L V8 (32-valve DOHC) and 4.0L V8 Bi-Turbo (S8)

Horsepower 4.2L V8 32V:

Approx. 300-310 hp (depending on specific variant)

Torque 4.2L V8 32V:

Approx. 290-300 lb-ft

Horsepower 4.0L V8 Bi-Turbo S8:

Approx. 360 hp

Torque 4.0L V8 Bi-Turbo S8:

Approx. 400-420 lb-ft

Fuel System:

Multi-point fuel injection (MPI), Electronic Engine Control (ECU)

Engine Management:

Bosch Motronic (specific variant dependent)

Emission Control Systems:

Catalytic converters, secondary air injection, EVAP system, EGR (depending on market/engine)

Engine Configuration:

V6 and V8 engines, naturally aspirated and twin-turbocharged (S8)

Valve Train:

DOHC (Dual Overhead Camshafts) with 4 valves per cylinder (32v for 4.2L V8, 40v for later 4.2L V8 and S8).

🔧 Transmission

Standard Transmission:

5-speed Tiptronic automatic transmission (often standard on A8, optional on S8 depending on market/spec)

Optional Transmission:

6-speed manual transmission (less common, often on S8 in some markets)

Features:

Torsen center differential (quattro AWD), electronic stability program (ESP), adaptive shift logic

Fluid Type Automatic:

G 052 162 A2 (or equivalent Dexron III/Mercon compatible ATF)

Fluid Capacity Automatic:

Approx. 8-10 liters (check manual for exact fill level)

Fluid Type Manual:

G 052 171 A2 (or equivalent GL-4 SAE 75W-90 synthetic)

Drivetrain:

quattro permanent all-wheel drive

📐 Dimensions

Exterior Length:

Approx. 5034 mm (A8), 5072 mm (S8)

Exterior Width:

Approx. 1880 mm

Exterior Height:

Approx. 1420 mm

Wheelbase:

Approx. 2944 mm

Curb Weight:

Approx. 1800-2000 kg (depending on engine and options)

Gross Vehicle Weight:

Not specified, but typically around 2500 kg

Wheel Base Options:

Standard wheelbase for A8, often longer wheelbase available on A8 (A8 L), S8 typically standard wheelbase.

🛡️ Safety Features

Ratings:

No standardized crash test ratings readily available from NHTSA/IIHS for this specific model year and region, but known for robust construction.

Active Features:

Anti-lock Braking System (ABS), Electronic Brake-force Distribution (EBD), Electronic Stability Program (ESP), Traction Control (ASR)

Passive Features:

Front airbags, side airbags, optional front and rear head curtain airbags, seatbelt pre-tensioners, impact-absorbing body structure

💡 Technology Features

Infotainment:

Audi Navigation System (RNS-D), Bose premium sound system, CD changer, AM/FM radio, cassette player.

Infotainment Additional:

Color display for navigation and climate control, steering wheel mounted audio controls.

Driver Assistance:

Cruise control, parking sensors (optional), automatic climate control.

Connectivity:

Voice control (optional), hands-free phone system (optional).

Lighting:

Xenon headlights (optional on A8, often standard on S8), automatic headlight range adjustment.

🔧 Maintenance

Service Intervals Oil:

Typically 7,500-10,000 miles or 12 months, whichever comes first, under normal driving conditions (refer to manual for severe service intervals).

Service Intervals Spark Plugs:

Approx. 60,000-100,000 miles for iridium spark plugs (check manual for exact type and interval).

Fluid Specifications Coolant:

G 12 Plus (Pink) or G 12 EVO (Purple) ethylene glycol coolant, mixed 50/50 with distilled water.

Fluid Specifications Brake:

DOT 4 brake fluid

Fluid Specifications Power Steering:

G 002 000 (or equivalent CHF 11S/Pentosin) hydraulic fluid

Known Issues:

Ignition coil failure, mass airflow sensor (MAF) issues, ABS wheel speed sensor failures, cooling system leaks (especially coolant flange), timing belt tensioner/guide wear (on earlier non-chain models), automatic transmission valve body issues, suspension component wear (bushings, control arms), electrical gremlins (various sensors, door modules).

Timing Belt Tensioner Spec:

On 32-valve V8 engines, timing belt service is critical with replacement of tensioners, guides, and water pump every ~70,000 miles. The 40-valve V8 and some V6 engines may have timing chains.

Fluid Specifications Engine Oil:

SAE 0W-40 or 5W-40 synthetic engine oil, meeting VW 502 00 / 505 00 specifications.

Engine Oil Capacity:

Approx. 7.5-8.5 liters for V8 engines, 5.0-5.5 liters for V6 engines (check manual for exact capacity).

📚 Vehicle History

Brand Heritage:

Audi, a German automotive manufacturer, has a long history of engineering excellence, particularly known for its quattro all-wheel-drive system and advanced technology.

Model Evolution:

The D2 generation Audi A8 (1994-2002) represented Audi's bold entry into the full-size luxury sedan segment, emphasizing aluminum construction (ASF - Audi Space Frame) for reduced weight and improved rigidity. The S8 variant offered enhanced performance with a more powerful engine and sportier tuning.

Model Evolution Additional:

The 1999 model year falls within the mid-cycle refresh for the D2 platform, introducing updated styling cues, revised interior appointments, and potentially more advanced engine options compared to early D2 models.

Production Years D2:

1994-2002

Production Location:

Neckarsulm, Germany

🏆 Awards & Recognition

Recognitions:

While specific awards for the 1999 model year might be scarce in public databases, the D2 A8 generation was generally well-received for its blend of luxury, performance, and innovative technology, contributing to Audi's growing reputation in the premium segment.