Engine Overview:
Detailed repair and diagnostic procedures for all gasoline and diesel engines offered in the B5 A4 generation.
Engine Specifics:
Covers 1.8L Turbo (AEB, APB, ATW, AWM), 2.8L V6 (AFC, AHA, ATQ) engines, including timing belt service, cylinder head overhauls, and component replacement.
Transmission Systems:
Comprehensive coverage for manual (01A, 02X) and automatic (01N, 01M, 01V) transmissions.
Drivetrain And Axles:
Detailed procedures for front-wheel drive (FWD) and quattro all-wheel drive (AWD) systems, including CV joints, driveshafts, differential service, and hub bearing replacement.
Suspension And Steering:
Front and rear suspension component repair (control arms, ball joints, bushings), steering rack and pump service, alignment specifications.
Braking System:
ABS system diagnostics and repair, brake caliper service, rotor replacement, fluid bleeding procedures, parking brake adjustments.
Electrical System:
Wiring diagrams, component testing, starter, alternator, battery service, fuse and relay locations, body control module (BCM) functions.
HVAC System:
Air conditioning system service, climate control unit diagnostics, heater core replacement, blower motor service.
Fuel System:
Fuel pump replacement, fuel injector cleaning and replacement, fuel pressure testing, EVAP system diagnostics.
Cooling System:
Radiator, water pump, thermostat replacement, coolant type specifications, leak testing.
Exhaust System:
Catalytic converter replacement, muffler and pipe service, oxygen sensor locations and testing.
Body And Chassis:
Door and lock mechanism repair, exterior trim replacement, interior panel removal, body panel alignment.
Lighting System:
Headlight, taillight, and interior lighting troubleshooting, bulb replacement, headlight aiming.
Safety Systems:
Airbag system diagnostics and replacement, seatbelt service, SRS component locations.
Routine Maintenance:
Oil changes, filter replacements (oil, air, fuel, cabin), spark plug replacement, brake fluid flush, coolant flush.
Troubleshooting Diagnostics:
Step-by-step diagnostic trees for common drivability, electrical, and mechanical issues.
Major Component Overhaul:
Engine rebuild procedures, transmission rebuilds, turbocharger replacement.
Component Replacement:
Detailed instructions for replacing virtually every component on the vehicle.
Torque Specifications:
Essential torque values for all critical fasteners throughout the vehicle.
Special Tools:
Identification and usage instructions for necessary Audi special tools.
Depth Level:
Complete factory-level service and repair information, suitable for professional technicians and advanced DIYers.
Diagnostic Capability:
Detailed explanation of diagnostic trouble codes (DTCs) and diagnostic strategies.
Wiring Diagrams:
Extensive and detailed electrical schematics for all vehicle systems.
Engine 1.8T Code:
AEB (1997-1999), APB (2000), ATW (1999-2000), AWM (2000)
Engine 1.8T Displacement:
1.8 Liters (1781 cc)
Engine 1.8T Configuration:
Inline-4, turbocharged, DOHC, 20 valves
Engine 1.8T Horsepower:
150 hp @ 5700 rpm (all variants)
Engine 1.8T Torque:
155 lb-ft @ 1950 rpm (all variants)
Engine 2.8L V6 Code:
AFC (1997-1998), AHA (1999-2001), ATQ (2001)
Engine 2.8L V6 Displacement:
2.8 Liters (2771 cc)
Engine 2.8L V6 Configuration:
V6, DOHC, 30 valves
Engine 2.8L V6 Horsepower:
170 hp @ 6000 rpm (AFC), 172 hp @ 6000 rpm (AHA/ATQ)
Engine 2.8L V6 Torque:
191 lb-ft @ 3200 rpm (AFC), 191 lb-ft @ 3200 rpm (AHA/ATQ)
Fuel Delivery:
Electronic Fuel Injection (EFI)
Recommended Fuel:
Premium Unleaded Gasoline (91 AKI or higher for 1.8T, 87 AKI or higher for 2.8L V6)
Oil Change Interval:
Typically every 7,500 miles or 12 months, whichever comes first, under normal driving conditions. Check manual for severe conditions.
Timing Belt Replacement:
Critical for 1.8T and 2.8L V6 engines. Intervals vary but generally around 70,000-100,000 miles. Failure to replace can cause catastrophic engine damage.
Spark Plug Replacement:
Recommended around 60,000-100,000 miles depending on plug type (e.g., platinum or iridium).
Engine Oil Type:
Refer to manual for specific viscosity (e.g., 0W-30, 5W-40). Often requires VW 500.00, 502.00, or 503.00 approved oil for turbocharged engines.
Coolant Type:
G12 or G12+ (Pink/Red) coolant. Typically a 50/50 mix with distilled water.
Transmission Fluid Manual:
API GL-4 or GL-5 gear oil, viscosity typically 75W-90. Specific Audi specifications apply.
Transmission Fluid Automatic:
G 052 162 A1 or equivalent (e.g., ATF Dexron III compatible fluid for some models). Check manual for specific type.
Brake Fluid Type:
DOT 4 brake fluid.
Ignition Coils:
Premature failure of ignition coils, particularly on 1.8T engines, can cause misfires.
Oil Leaks:
Common oil leaks from valve cover gaskets, oil pan gaskets, and crank seals due to aging rubber seals.
Suspension Components:
Wear and tear on control arm bushings, ball joints, and tie rod ends, leading to steering looseness and uneven tire wear.
Climate Control Flaps:
Failure of the small plastic actuators controlling the HVAC blend doors, leading to loss of temperature control.
Window Regulators:
Failure of the electric window regulators, often due to plastic components breaking.
Crankcase Ventilation System:
Clogged crankcase ventilation (PCV) system can lead to increased oil consumption and seal failures.
ABS Sensors:
Failure of ABS wheel speed sensors can trigger ABS warning lights and disable ABS functionality.
Audi Legacy:
Part of the Volkswagen Group, Audi has a long history of engineering excellence and automotive innovation dating back to the early 20th century.
B5 Introduction:
The B5 generation Audi A4 was introduced in 1994 (Europe) and 1995 (North America), replacing the Audi 80/90. This manual covers the latter half of its lifecycle.
B5 Facelift:
The B5 generation received a facelift for the 1999 model year, featuring updated exterior styling (headlights, taillights, bumpers, grille) and interior revisions.
Production Locations:
Primarily produced at the Audi plant in Ingolstadt, Germany, and also in Brussels, Belgium.
