Engine Mechanical:
Engine assembly, disassembly, internal components (pistons, rings, bearings, valves, camshafts), cylinder head, block, timing systems
Fuel System:
Fuel pump, injectors, fuel lines, fuel filter, evaporative emissions control (EVAP)
Exhaust System:
Exhaust manifold, catalytic converter, muffler, oxygen sensors, exhaust pipes
Cooling System:
Radiator, water pump, thermostat, coolant hoses, fan, coolant specifications
Ignition System:
Spark plugs, ignition coils, distributor (if applicable), ignition timing, ECU control
Electrical System:
Battery, alternator, starter motor, fuses, relays, lighting, power windows, locks, mirrors
Transmission Manual:
Clutch operation, clutch replacement, manual gearbox removal and installation, internal components, fluid specifications
Transmission Automatic:
Automatic gearbox operation, removal and installation, torque converter, internal components, fluid specifications, electronic control unit (ECU) interaction
Brakes:
Brake system components (master cylinder, calipers, pads, rotors, lines), anti-lock braking system (ABS) diagnostics and repair, brake fluid specifications
Steering System:
Power steering pump, steering rack, tie rods, steering column, fluid specifications
Suspension System:
Front and rear suspension components (struts, shocks, control arms, bushings, ball joints), alignment specifications
Wheels And Tires:
Tire pressure recommendations, wheel torque specifications, wheel bearing replacement
Bodywork And Chassis:
Frame and body repair, doors, hood, trunk, bumpers, exterior trim, interior trim
Climate Control:
HVAC system, air conditioning (AC) operation and service, heater core, climate control unit
Diagnostics:
On-board diagnostics (OBD-II) system, diagnostic trouble codes (DTCs), fault finding procedures
Wiring Diagrams:
Comprehensive electrical wiring schematics for all major systems
Maintenance Procedures:
Routine maintenance tasks, fluid changes, filter replacements, tune-ups
Repair Procedures:
Step-by-step instructions for a wide range of repairs, from minor adjustments to major component overhauls
Troubleshooting Guides:
Systematic approaches to diagnose and resolve common and uncommon issues
Component Replacement:
Detailed instructions for removing and installing various parts and assemblies
Diagnostic Testing:
Methods for testing electrical components, sensors, actuators, and mechanical systems
Depth:
Comprehensive; covers everything from basic fluid checks to complete engine and transmission rebuilds
Target Audience:
Professional technicians and advanced DIY enthusiasts
Engine Options:
Various inline-4 and V6 gasoline engines, and inline-4 turbocharged diesel engines (TDI).
1.6L I4 (Ahl, Ana, Alz):
Displacement: 1595 cc, Power: 100 PS (99 hp; 74 kW), Torque: 140 Nm (103 lb-ft)
1.8L I4 (Adr, Apt, Avv, Ark, Apu, Anb, Bex, Bfb):
Displacement: 1781 cc, Power: 115-125 PS (114-123 hp; 85-92 kW), Torque: 165-173 Nm (122-128 lb-ft)
1.8L I4 Turbo (Aeb, Apu, Awl, Ajl, Amb, Bex, Bfb):
Displacement: 1781 cc, Power: 150-180 PS (148-178 hp; 110-132 kW), Torque: 210-230 Nm (155-170 lb-ft)
2.4L V6 (Apl, Amm, Alf, Arj):
Displacement: 2393 cc, Power: 165-170 PS (163-168 hp; 121-125 kW), Torque: 230 Nm (170 lb-ft)
2.8L V6 (Ack, Alg, Amx, Apr, Aqd, Atx, Bbg):
Displacement: 2771 cc, Power: 174-204 PS (171-201 hp; 128-150 kW), Torque: 250 Nm (184 lb-ft)
1.9L Tdi I4 Turbo Diesel (Ahh, Ahu, Ahi, Alh):
Displacement: 1896 cc, Power: 90-110 PS (89-109 hp; 66-81 kW), Torque: 205-235 Nm (151-173 lb-ft)
Drivetrain:
Front-wheel drive (FWD) or Quattro all-wheel drive (AWD)
Fuel Injection:
Multi-point fuel injection (MPI) for gasoline, Direct Injection (TDI)
NHTSA Front Crash Test:
4-star driver, 5-star passenger (for sedan models of this era, generally)
Traction Control:
Traction Control System (TCS), often integrated with ABS, standard on many models.
Stability Control:
Electronic Stabilization Program (ESP) available on some models, particularly later production or higher trims.
ABS:
Anti-lock Braking System (ABS) standard on all models.
Airbags:
Driver and front passenger airbags, optional side airbags.
Seatbelts:
Three-point inertia-reel seatbelts with pre-tensioners and force limiters.
Oil Change Interval:
Typically every 7,500-10,000 miles (12,000-16,000 km) or 12 months, depending on driving conditions and oil type (consult manual for specifics).
Timing Belt Replacement:
For non-TDI models with timing belts (e.g., 2.4L, 2.8L V6), typically every 60,000-75,000 miles (96,000-120,000 km). TDI models use a timing chain or belt depending on specific engine variant. Crucial to check for belt-driven engines.
Brake Fluid Change:
Every 2 years, regardless of mileage.
Coolant Change:
Typically every 30,000-60,000 miles (48,000-96,000 km) or 2-4 years.
Engine Oil Specification:
API SJ or higher, ACEA A3/B3/B4. Viscosity grades: 5W-40, 0W-40 (for colder climates) - specific grade depends on engine and ambient temperature. Consult manual for exact VW/Audi approval codes (e.g., VW 502 00).
Transmission Fluid Manual:
G 005 290 / G 052 171 (Manual Transmission Fluid).
Transmission Fluid Automatic:
G 052 162 (ATF for Tiptronic).
Coolant Type:
G12 (Pink/Red coolant) or G11 (Blue/Green coolant) - often specified as VAG TL 774-C or TL 774-D/F. Must be mixed with distilled water. Check manual for specific engine requirements.
Ignition Coil Failure:
Common issue on 1.8T engines, leading to misfires and rough running.
Mass Airflow Sensor (Maf):
Can become dirty or fail, causing poor engine performance and stalling.
ABS Sensor Failure:
Wheel speed sensors can fail, illuminating the ABS and TCS warning lights.
Suspension Components:
Control arm bushings, ball joints, and tie rod ends are wear items prone to premature failure due to road conditions.
Oil Leaks:
Valve cover gaskets, oil pan gaskets, and oil filter housing seals are common sources of oil leaks as the vehicles age.
Climate Control Actuators:
Blend door actuators can fail, leading to incorrect temperature distribution or inability to control airflow direction.
Brand History:
Audi, a German manufacturer with a long history dating back to the early 20th century, known for its quattro all-wheel-drive system and advanced engineering.
B5 Generation Introduction:
The B5 generation Audi A4 was introduced in late 1994 (as a 1995 model in Europe) and replaced the Audi 80/90. It marked a significant step in Audi's design and technology, featuring a more rounded and aerodynamic design.
B5 Facelift:
A significant facelift occurred for the 1999 model year, introducing revised exterior styling (headlights, taillights, grille, bumpers), updated interior trim, and powertrain enhancements.
Production Period:
1994-2001 (Europe), 1995-2001 (North America)
Manufacturing Sites:
Ingolstadt, Germany; Brussels, Belgium.