Market Position:
The Audi 100 (C4) represented Audi's upscale sedan offering in the early 1990s, competing against established luxury marques from Germany and the United States. It was positioned as a premium, front-wheel-drive or all-wheel-drive (Quattro) vehicle known for its build quality, sophisticated design, and comfort.
Competitive Analysis:
Competitors included models like the Mercedes-Benz W124 E-Class, BMW 5 Series (E34), and Volvo 900 series. The Audi 100 distinguished itself with its advanced Quattro all-wheel-drive system, aerodynamic styling, and a focus on safety and build integrity.
Key Features:
Profoundly robust engineering, Quattro all-wheel-drive availability, refined interior, excellent safety features for its era, aerodynamic profile, and a reputation for long-term durability when properly maintained.
Coverage Areas:
Full Service, Repair, Maintenance, Diagnostics, Electrical Schematics, Bodywork, Troubleshooting
Page Count:
Estimated 1000+ pages (typical for comprehensive workshop manuals of this era)
Manual Type:
Workshop Service and Repair Manual
Format:
PDF (Digital Download)
Systems Covered:
Engine Mechanical, Engine Management (ECU), Fuel System, Ignition System, Cooling System, Lubrication System, Exhaust System, Drivetrain (FWD/Quattro AWD), Manual and Automatic Transmissions, Clutch, Suspension (Front & Rear), Steering System, Braking System (ABS), Air Conditioning System, Heating System, Electrical System (Wiring Diagrams, Components), Body & Chassis, Interior Trim, Exterior Trim, Diagnostic Procedures
Procedures Included:
Routine Maintenance (Oil Changes, Filter Replacement, Spark Plugs), Tune-up Procedures, Engine Rebuilds, Transmission Overhauls, Brake Service (Pads, Rotors, Calipers), Suspension Component Replacement (Shocks, Struts, Bushings), Steering System Repairs, Electrical Troubleshooting and Component Replacement, Diagnostic Fault Code Interpretation, Body Panel Alignment and Repair, Air Conditioning Servicing, Body Electrical and Lighting Diagnostics, Interior Component Repair
Technical Depth:
Comprehensive, including detailed step-by-step repair instructions, exploded views, torque specifications, diagnostic flowcharts, wiring diagrams, and component identification.
Electrical Schematics Depth:
Detailed wiring diagrams for all major systems, including engine management, lighting, power windows, central locking, ABS, and instrumentation.
Troubleshooting Guides:
Diagnostic flowcharts and symptom-based troubleshooting procedures for common and uncommon problems across all vehicle systems.
Bodywork Repair:
Information on body panel removal and installation, door mechanisms, glass replacement, and basic collision repair considerations.
Torque Specifications Detail:
Comprehensive list of torque values for all critical fasteners, essential for proper assembly and safety.
Diagnostic Tool Requirements:
Information on the use of factory diagnostic tools or equivalent aftermarket scan tools for accessing engine control unit (ECU) data and fault codes (e.g., OBDI data retrieval).
Primary Engine:
2.8L 12-Valve SOHC V6 (AAH engine code)
Horsepower Hp:
172 hp @ 5500 rpm
Torque Lb Ft:
184 lb-ft @ 3000 rpm
Fuel System:
Bosch Motronic Electronic Fuel Injection (EFI)
Engine Codes Covered:
AAH (2.8L V6). May also include details for other 4-cylinder variants if applicable to the 1993 model year range of the C4 platform (e.g., AAR 2.3L 5-cylinder).
Cooling System Type:
Pressurized Liquid Cooling System
Oil Capacity Quarts:
Approx. 5.0 US quarts (4.7 liters) with filter change (for 2.8L V6)
Recommended Oil Viscosity:
5W-30 or 5W-40 (API SG/SH or higher)
Transmission Standard:
5-speed Manual Transmission
Transmission Optional:
4-speed Automatic Transmission (Tiptronic optional in later C4 models, but standard automatic is common for '93)
All Wheel Drive:
Audi Quattro All-Wheel Drive System (Optional)
Fluid Specifications Auto
Automatic Transmission Fluid:
G 052 162 A1 (or equivalent DEXRON III/MERCON)
Fluid Specifications Manual
Manual Transmission Fluid:
G 052 171 A2 (or equivalent API GL-4 SAE 75W-90)
Curb Weight Lbs:
Approx. 3,300 - 3,600 lbs (depending on drivetrain and equipment)
Gross Vehicle Weight Rating Gvwr Lbs:
Approx. 4,500 - 4,800 lbs
Trunk Volume Cu Ft:
Approx. 15.0 - 16.0 cu ft
NHTSA Frontal Crash Rating:
Not explicitly rated by NHTSA in the modern standardized way, but known for robust safety cage and early adoption of safety features.
Active Safety Features:
Anti-lock Braking System (ABS), Quattro All-Wheel Drive (optional, enhances traction)
Passive Safety Features:
Driver and front passenger airbags, reinforced safety cage construction, front and rear crumple zones, side-impact protection beams, three-point seatbelts with pretensioners.
Headlight Type:
Halogen, often with aerodynamic composite lenses.
Infotainment System:
Factory AM/FM stereo with cassette player, optional CD player. Speaker systems varied by trim level.
Driver Assistance Features:
Cruise control, power steering, Anti-lock Braking System (ABS), trip computer (on higher trims).
Climate Control System:
Manual or automatic climate control system with air conditioning.
Lighting Features:
Halogen headlamps, fog lights (optional), power-adjustable headlamps.
Seat Features:
Power adjustable front seats with memory function (optional), heated front seats (optional), leather upholstery (optional).
Oil And Filter Change Interval:
Every 5,000 - 7,500 miles or 6-12 months, whichever comes first (consult manual for specific conditions and oil type).
Service Intervals Spark Plugs
Spark Plug Replacement Interval:
Approximately 30,000 - 60,000 miles (depending on spark plug type used, e.g., standard vs. platinum).
Service Intervals Timing Belt
Timing Belt Replacement Interval:
Crucial for V6 engines. Typically 60,000 - 100,000 miles or 5-7 years. Failure can cause catastrophic engine damage.
Fluid Specifications Coolant
Coolant Type:
G 12 (Pink) or G 11 (Blue) ethylene glycol based antifreeze (consult manual for exact specification and mixture ratio).
Coolant Capacity Liters:
Approx. 7.5 - 8.5 liters (for 2.8L V6)
Fluid Specifications Brake
Fluid Specifications Power Steering
Power Steering Fluid Type:
G 002 000 (or equivalent CHF 11S / Pentosin)
Common Issues:
Ignition coil failures, coolant flange leaks (especially on V6), power steering hose leaks, window regulator failures, ABS sensor issues, climate control head unit failures, differential wear (on Quattro models), exhaust manifold cracks (on some V6 variants).
Oil Filter Part Number Example:
Mann-Filter W 914/2 or Mahle OC 127 (verify for specific engine variant)
Air Filter Part Number Example:
Mann-Filter C 26 134 or Mahle LX 36 (verify for specific engine variant)
Brand Heritage:
Audi, a German automotive manufacturer, has a rich history dating back to the early 20th century. Known for its engineering prowess, quattro all-wheel drive technology, and premium vehicle segment presence.
Model Evolution:
The Audi 100 C4 generation was introduced in 1991 as a successor to the C3. It featured a more modern, aerodynamic design, improved interior, and a new platform. It was succeeded by the Audi A6 in 1994.
Production Years:
Audi 100 C4: 1991-1994 (model year 1993 falls within this period).
Manufacturing Locations:
Primary manufacturing in Ingolstadt, Germany.
Recognitions:
While specific awards for the 1993 model year may be scarce, the Audi 100 C4 platform was generally well-regarded for its build quality, design, and safety in automotive reviews of its time, often cited for bridging the gap between mainstream and luxury vehicles.
Ratings:
Consumer satisfaction surveys and automotive publications of the era often praised Audi's interior quality and driving dynamics for the period.
