This comprehensive service and repair manual for the 2004 Audi A3 (8P) provides detailed instructions, diagrams, illustrations, wiring schematics, and specifications for all aspects of your vehicle. This manual covers all models and all repairs, offering the same information used by technicians at dealerships.

You'll have everything you need to maintain, service, diagnose, and repair your Audi A3 with ease. Access step-by-step instructions for a complete range of operations, including:

• Maintenance:

Regular maintenance schedules, fluid changes, and filter replacements.

Engine:

Engine components, operation, troubleshooting, and repair procedures.

Control System:

Electronic control units, sensors, actuators, and engine management.

Mechanical:

Chassis, suspension, steering, brakes, and drivetrain components.

Fuel Service Specifications:

Fuel system components, injection systems, and fuel management.

Emission Control:

Catalytic converter, exhaust system, and emission control systems.

Intake Exhaust Cooling:

Intake and exhaust systems, cooling systems, and related components.

Lube:

Lubrication systems, oil changes, and lubrication specifications.

Ignition Starting Charging:

Ignition system, starting system, and charging system.

Auto Transmission Clutch:

Automatic transmission operation, repair procedures, and clutch systems.

Manual Transmission:

Manual transmission operation, repair procedures, and gearboxes.

Transfer Propeller Shaft:

Transfer case, propeller shaft, and driveline components.

Drive Shaft:

Drive shafts, axles, and related components.

Differential:

Differential operation, repair procedures, and components.

Axle Suspension:

Axle components, suspension systems, shock absorbers, and struts.

Tire & Wheel:

Tire specifications, wheel information, and maintenance.

Brake Control:

Brake system control modules, sensors, and actuators.

Brake:

Brake system, calipers, rotors, pads, and brake lines.

Parking Brake:

Parking brake system operation and components.

Steering Column:

Steering column, steering wheel, and related components.

Power Steering:

Power steering system, pump, and hydraulics.

Air Condition:

Air conditioning system, refrigerant, and components.

Suppl Restraint System:

Airbag system, seatbelt pretensioners, and related components.

Seat Belt:

Seat belt operation, adjustment, and replacement.

Engine Immobilizer:

Engine immobilizer system, key coding, and security features.

Cruise Control:

Cruise control system operation and components.

Wiper & Washer:

Wiper system, washer system, and related components.

Door Lock:

Door lock system, actuators, and keyless entry systems.

Meter Audio/Visual:

Instrument panel, gauges, displays, and audio/visual systems.

Horn:

Horn operation and components.

Windshield/Glass Mirror:

Windshield, glass, mirrors, and related components.

Instrument Panel:

Instrument panel components, controls, and switches.

Seat:

Seat adjustments, upholstery, and seat components.

Engine Hood/ Door:

Engine hood, doors, and related components.

Exterior & Interior:

Exterior and interior trim, body panels, and components.

Electrical:

Electrical system, wiring diagrams, and components.

Multiplex/ Can Communication:

Multiplex system, CAN bus communication, and network diagnostics.

This manual is compatible with all versions of Windows and Mac operating systems. You can print any page or diagram you require directly from the manual, making it convenient to refer to the information while you work on your vehicle.

The 2004 Audi A3 (8P) was the second generation of the A3 compact executive car, produced by Audi from 2003 to 2013. It marked a significant departure from its predecessor, adopting the Volkswagen Group's versatile PQ35 platform, which also underpinned models like the Volkswagen Golf Mk5 and SEAT Leon. This new platform brought about a substantial increase in size, interior space, and overall refinement compared to the original 8L A3. The 8P A3 was offered in a variety of body styles, including a three-door hatchback, a five-door hatchback, and a three-door convertible.

The 2004 A3 was praised for its sophisticated handling, comfortable ride, and stylish interior. It offered a range of petrol and diesel engines, all of which were known for their efficiency and performance. The most popular engine options included a 1.6-liter petrol engine, a 2.0-liter turbocharged petrol engine, and a 1.9-liter turbocharged diesel engine. The 8P A3 also benefited from a comprehensive suite of safety features, including standard ABS, ESP, and multiple airbags. Despite its success, the 8P A3 was criticized for its high price tag and occasional build quality issues. Nonetheless, it established itself as a popular choice in the premium compact car segment, offering a compelling combination of style, performance, and practicality.