Target Audience:
Technicians, mechanics, and DIY enthusiasts
Segment:
Premium compact executive sedan
Competitive Advantage:
Factory-level repair procedures, diagnostic information, and complete technical specifications in one manual
Coverage Depth:
Complete service and repair manual covering every single detail
Factory Procedures:
Complete engine overhaul, disassembly, inspection, and rebuild procedures
Diagnostics:
Symptom-based troubleshooting with diagnostic flowcharts
Illustrations:
Exploded-view parts diagrams, wiring diagrams, and step-by-step procedural diagrams
Coverage Areas:
Engine, transmission, drivetrain, electrical, brakes, suspension, steering, cooling, heating, and fuel systems
Manual Type:
Service and Repair Workshop Manual
Page Count:
N/A - varies by print run; digital chapters are bookmarked for navigation
Format:
Searchable PDF — zoomable, printable, bookmarked chapters
Delivery Method:
Instant digital download — no shipping, no waiting
Compatibility:
Windows PC, Mac, tablets, and smartphones
Access:
Download again anytime after purchase
General Information:
Safety warnings, vehicle identification, and maintenance schedules
Engine:
Complete overhaul — disassembly, inspection, and rebuild
Transmission and Drivetrain:
Full service and repair procedures
Electrical System:
Diagnostics, testing, and repair with wiring diagrams
Brake System:
Inspection, service, and component replacement
Suspension and Steering:
Component service and alignment procedures
Cooling and Heating:
System maintenance and repair
Fuel System:
Maintenance and repair procedures
HVAC:
Heating and air conditioning service
Troubleshooting:
Symptom-based troubleshooting with diagnostic flowcharts and diagnostic trees
Electrical Testing:
Multimeter procedures and component function verification
Wear Limits:
Wear limit inspections and allowable tolerances for all components
Assembly Guides:
Step-by-step procedural diagrams with tool usage illustrations
Component Location:
Component identification and location guides
Torque Specifications:
Tightening torque specifications for all fasteners
Factory Specs:
All factory specifications, tolerances, and wear limits included
Special Tools:
Special service tool numbers with illustrations
Wiring Diagrams:
Detailed wiring diagrams and electrical schematics
Parts Diagrams:
Exploded-view parts diagrams with OEM part numbers
Part Numbers:
OEM part numbers referenced throughout procedures
File Format:
PDF (searchable, bookmarked, zoomable)
Compatibility:
Windows, macOS, Linux, iOS, and Android — any device with a PDF reader
Requirements:
A PDF reader application (e.g. Adobe Acrobat Reader, free)
Searchability:
Fully text searchable for fast lookup of any topic
Print Quality:
High-resolution digital pages, printable at full clarity
Binding Type:
N/A — digital download, no physical binding
Paper Type:
N/A — digital download, no physical paper
Engine Options:
1.8L turbocharged inline-4 (AEB) and 2.8L V6 (AHA/ATQ) gasoline engines
1.8T Displacement:
1.8L (1781 cc) turbocharged DOHC 20-valve inline-4
2.8 Displacement:
2.8L (2771 cc) DOHC 30-valve V6
Detailed Specifications:
Refer to manual for detailed specifications
Performance and Fuel System
Fuel System:
Electronic multi-point sequential fuel injection
Fuel Type:
Premium unleaded gasoline
1.8T Output:
Approximately 150 hp (turbocharged inline-4)
2.8 Output:
Approximately 190 hp (30-valve V6)
Standard Transmission:
5-speed manual transmission
Optional Transmission:
5-speed automatic transmission with Tiptronic
Drivetrain:
Front-wheel drive (FWD) or quattro permanent all-wheel drive
Features:
Manual covers complete transmission and drivetrain service, overhaul, and clutch procedures
Wheelbase:
Approximately 102.6 in (2,606 mm)
Length:
Approximately 176.3 in (4,478 mm) sedan
Platform:
Volkswagen Group B5 platform
Curb Weight:
Approximately 3,100-3,400 lb depending on engine and drivetrain
Exact Figures:
N/A - refer to manual for model-specific values
Crash Test Information:
N/A - rating data not included in this service manual
Active and Passive Features
Airbags:
Driver and front passenger airbags
Seatbelts:
Three-point seatbelts with pretensioners
ABS:
Anti-lock braking system (ABS)
Manual Coverage:
Restraint system diagnostics and brake system service covered in manual
Audio System:
Factory AM/FM radio/cassette or optional CD changer; wiring diagrams included in manual
Instrumentation:
On-board driver information system with trip computer (where equipped)
Systems:
None of the modern driver assistance era — 1998 A4 predates these systems
Related Coverage:
Electrical system diagnostics and wiring schematics for onboard electronics included
Maintenance Schedules:
Factory maintenance schedules included in General Information section
Oil Change Interval:
Typically every 7,500 miles under normal service (confirm per schedule in manual)
Torque Specs:
All factory torque values provided for service fasteners
Fluid Specifications:
Fluid capacities and specifications listed in the manual
Known Issues:
1.8T oil sludge and turbocharger maintenance sensitivity; check control arm bushings and timing belt service intervals
Common Wear Items:
Timing belt, control arms, ignition components, and brake wear sensors
Manufacturer:
Audi AG (Volkswagen Group), Ingolstadt, Germany
Model Evolution:
The B5-generation A4 debuted in 1994 as Audi's premium compact executive car, succeeding the 80/90; the 1998 model year added the 30-valve 2.8L V6 and refined the 1.8T
Production Location:
Ingolstadt, Germany
Platform Significance:
B5 platform also underpinned the first-generation Audi A6 (C5) and Volkswagen Passat B5