🏷️ Basic Information

Make:

Audi

Model:

A6

Generation:

C5

Year:

1998

Chassis Code:

4B2 (Sedan), 4B5 (Avant)

Engine Codes Common:

AEB (1.8T), AWT (1.8T), APU (2.4 V6), ALS (2.4 V6), ASM (2.8 V6), AMX (2.8 V6), AHA (2.8 V6), ACK (2.8 V6), AKE (2.5 TDI V6), BDG (2.5 TDI V6), BCY (2.7T V6 Bi-Turbo), BES (2.7T V6 Bi-Turbo), AVS (3.0 V6 - later models, but some might have appeared in late 1998 production)

👋 Introduction

Target Audience:

Audi A6 C5 owners (1998) with basic mechanical skills and independent auto service professionals.

Advantage:

Vehicle-specific information, identical to dealer-issued manuals, offering significant cost savings on repairs and maintenance.

Documentation Style:

Accurate, clear, concise text with diagrams, illustrations, and wiring schematics.

Value Proposition:

Empowers owners to perform maintenance and repairs, understand their vehicle better, and communicate effectively with technicians.

📋 Manual Details

Comprehensive Scope:

Covers all major mechanical, electrical, and body systems.

Estimated Page Count:

Extensive (typical workshop manuals for this era are 1000+ pages).

Type:

Service Repair Workshop Manual

Language:

English

Digital Format:

PDF

📖 Manual Coverage

Engine Mechanical:

Engine assembly, disassembly, cylinder head, pistons, crankshaft, camshafts, timing, lubrication, cooling.

Engine Electrical:

Ignition system, starting system, charging system, engine sensors, ECU operation.

Emission Control:

Catalytic converter, secondary air injection, EVAP system, EGR (if applicable).

Fuel System:

Fuel pump, injectors, fuel lines, fuel pressure regulator, fuel filter, tank.

Clutch System:

Clutch disc, pressure plate, release bearing, hydraulic system.

Manual Transaxle:

Gearbox assembly, internal components, shift linkages, driveshafts, CV joints.

Automatic Transaxle:

Transmission types (e.g., Tiptronic), valve body, torque converter, transmission control module (TCM), fluid service.

Suspension System:

Front and rear suspension components (struts, shocks, control arms, bushings), alignment specifications.

Steering System:

Power steering pump, rack and pinion, steering column, tie rods.

Brake System:

Brake discs, pads, calipers, ABS system, parking brake, hydraulic lines.

Body Interior Exterior:

Body panel removal/installation, interior trim, seating, doors, windows, lighting.

Body Electrical:

Wiring diagrams, lighting, power windows, central locking, comfort features, instrument cluster.

HVAC:

Heating, ventilation, air conditioning system, refrigerant, components, climate control.

Restraint System:

Airbag system, seatbelts, SRS module.

Maintenance:

Oil changes, filter replacements, fluid checks and changes, spark plug replacement, belt inspection/replacement.

Troubleshooting:

Diagnostic procedures for common faults, symptom-based troubleshooting guides.

Repair Rebuild:

Step-by-step instructions for component removal, overhaul, and reinstallation.

Diagnostics:

OBD-II diagnostic trouble codes (DTCs), sensor testing, electrical system diagnostics.

Depth:

Comprehensive; suitable for both basic owner maintenance and professional repair work. Includes detailed diagrams and schematics.

📊 Manual Specifications

File Type:

PDF

Printability:

Yes, individual pages or sections can be printed.

Binding:

Not Applicable (Digital PDF)

Paper Quality:

Not Applicable (Digital PDF)

Reader:

Adobe PDF Reader

Operating Systems:

All Versions of Windows and Mac

⚙️ Engine Specifications

Engine Code:

AEB, AWT

Configuration:

Inline 4-cylinder, turbocharged, intercooled

Displacement:

1.8 Liters (1781 cc)

Bore X Stroke:

81.0 mm x 86.4 mm

Compression Ratio:

9.5:1

Horsepower:

150 PS (148 hp) @ 5700 rpm

Torque:

210 Nm (155 lb-ft) @ 1750-4600 rpm

Engine Code:

APU, ALS

Configuration:

V6, naturally aspirated

Displacement:

2.4 Liters (2393 cc)

Horsepower:

165 PS (163 hp) @ 6000 rpm

Torque:

230 Nm (170 lb-ft) @ 3200 rpm

Engine Code:

ASM, AMX, AHA, ACK

Configuration:

V6, naturally aspirated

Displacement:

2.8 Liters (2771 cc)

Horsepower:

190 PS (187 hp) @ 6000 rpm

Torque:

280 Nm (207 lb-ft) @ 3200 rpm

Engine Code:

AKE, BDG

Configuration:

V6, turbocharged, direct injection diesel

Displacement:

2.5 Liters (2493 cc)

Horsepower:

150 PS (148 hp) @ 4000 rpm (AKE), 155 PS (153 hp) @ 4000 rpm (BDG)

Torque:

310 Nm (229 lb-ft) @ 1750 rpm (AKE), 310 Nm (229 lb-ft) @ 1500-3000 rpm (BDG)

Fuel Type:

Unleaded gasoline (RON 91 or higher for 1.8T/2.4/2.8), Diesel fuel

🔧 Transmission

Type:

5-speed Manual (e.g., 01E for Quattro models, 01A for FWD models)

Type:

5-speed Tiptronic Automatic (e.g., 5HP19)

Drivetrain Options:

Front-Wheel Drive (FWD) or quattro Permanent All-Wheel Drive

📐 Dimensions

Length:

Approx. 4815 mm (189.6 in)

Width:

Approx. 1765 mm (69.5 in)

Height:

Approx. 1462 mm (57.6 in)

Length:

Approx. 4815 mm (189.6 in)

Width:

Approx. 1765 mm (69.5 in)

Height:

Approx. 1472 mm (57.9 in)

Curb Weight Approx:

1500-1750 kg (3300-3850 lbs) depending on engine and drivetrain

🛡️ Safety Features

Crash Test Notes:

While specific NHTSA/IIHS ratings for 1998 models are often not readily available in summary, the C5 platform generally performed well for its era, benefiting from Audi's focus on safety engineering.

ABS:

Standard Anti-lock Braking System (ABS)

Esp Optional:

Electronic Stability Program (ESP) available on some models/trims.

Airbags:

Front airbags, optional side airbags.

Seatbelts:

Three-point inertia-reel seatbelts with front belt tensioners.

💡 Technology Features

Head Unit Options:

Various Audi Chorus, Concert, and Symphony radio/CD players. Navigation systems were available on higher trims.

Parking Sensors:

Optional rear parking sensors.

Phone Integration:

Optional factory-installed cellular phone preparation kits.

🔧 Maintenance

Engine Oil Change:

Typically every 10,000 miles or 1 year, whichever comes first. Refer to manual for specific engine type and oil specification.

Oil Filter Replacement:

Replace with every oil change.

Air Filter Replacement:

Inspect every 10,000 miles, replace as needed (typically every 20,000-30,000 miles).

Cabin Filter Replacement:

Replace annually or as needed.

Coolant Flush:

Every 2-3 years or 30,000-50,000 miles. Use G12 coolant.

Brake Fluid Flush:

Every 2 years. Use DOT 4.

Automatic Transmission Fluid Change:

Refer to specific vehicle maintenance schedule. Often around 60,000-100,000 miles. Use Pentosin ATF 1 or equivalent.

Manual Transmission Fluid Change:

Inspect periodically, change if necessary. Use G501.300.01.00 or equivalent (e.g., GL-4/GL-5 specification as per manual).

Engine Oil:

SAE 5W-40 or 0W-40 synthetic oil meeting VW 502 00 specification.

Power Steering Fluid:

G 002 000 or equivalent hydraulic fluid.

Common Problems:

Ignition coil failure (particularly 1.8T), coolant flange leaks (especially on V6 models), timing belt tensioner wear (V6), power steering hose leaks, CV joint wear, ABS sensor failure, HVAC blower motor resistor failure.

📚 Vehicle History

Heritage:

Audi, a German premium automotive manufacturer with a long history of engineering excellence, particularly in quattro all-wheel drive technology and design.

C5 Introduction:

The C5 generation Audi A6 was introduced in 1997 (as a 1998 model in North America), succeeding the C4 generation. It marked a significant design and engineering update, featuring a more aerodynamic and contemporary styling. This generation also introduced the more powerful 2.7T Bi-Turbo engine and the 2.5 TDI V6 diesel engine for European markets.

Production Period:

1997-2004 (C5 generation)

🏆 Awards & Recognition

General Reputation:

The Audi A6 C5 was generally well-regarded for its comfortable ride, premium interior, and available quattro all-wheel-drive system, establishing Audi's presence in the luxury sedan/wagon market.