2002 Audi A4 Service and Repair Manual

This 2002 Audi A4 Service and Repair Manual Covers

Engine & Drivetrain

• 1.6L petrol engine service and repair (market dependent)
• 1.8L Turbo (1.8T) petrol engine servicing
• 2.0L naturally aspirated petrol engine repair procedures (selected markets)
• 2.4L V6 petrol engine servicing
• 3.0L V6 petrol engine repair procedures
• 1.9L TDI diesel engine servicing
• 2.5L V6 TDI diesel engine repair procedures
• Fuel injection and ignition system diagnostics
• Turbocharger inspection and servicing (1.8T models)
• Engine cooling system repairs
• Exhaust and emissions control system diagnostics
• 5-speed and 6-speed manual transmission servicing
• Multitronic CVT servicing (front-wheel-drive models)
• 5-speed Tiptronic automatic transmission servicing
• quattro all-wheel drive system servicing
• Torsen centre differential, driveshaft, rear differential, and CV joint repairs

Braking Systems

• Hydraulic brake system servicing
• Anti-lock Braking System (ABS) diagnostics
• Electronic Stability Program (ESP) diagnostics (where equipped)
• Electronic Brakeforce Distribution (EBD) diagnostics
• Brake Assist system diagnostics
• Brake pad and brake disc replacement procedures
• Brake hydraulic system bleeding
• Brake fluid replacement procedures

Chassis & Suspension

• Front four-link suspension repairs
• Rear independent suspension servicing
• Hydraulic power steering diagnostics
• Steering rack inspection and repair
• Wheel alignment specifications
• Wheel bearing replacement procedures
• Suspension component inspection and troubleshooting

Electrical & Wiring

• Complete factory wiring diagrams
• Battery, charging, and starting system diagnostics
• CAN Bus communication diagnostics
• Engine Control Module (ECM) diagnostics
• Instrument cluster diagnostics
• Immobilizer system diagnostics
• Audi Chorus, Concert, and Symphony audio system diagnostics
• Xenon headlamp diagnostics (where equipped)
• Central locking and power window repairs

Air Conditioning & HVAC

• Manual and dual-zone automatic climate control diagnostics
• Air conditioning compressor servicing
• Refrigerant recovery and recharge procedures
• HVAC control module diagnostics
• Heating and ventilation system repairs

Body & Interior

• Interior trim removal and installation
• Dashboard servicing procedures
• Door lock and latch repairs
• Power window regulator repairs
• Exterior lighting system servicing
• Airbag and occupant restraint system diagnostics
• Seat adjustment and seat heating repairs (where equipped)
• Sunroof servicing (where equipped)
• Body panel alignment and repair information

Diagnostics & Troubleshooting

• VAS factory diagnostic procedures
• Diagnostic Trouble Code (DTC) lookup procedures
• ECU coding and basic settings
• Guided fault-finding routines
• Sensor and actuator testing
• Fuel injection system diagnostics
• Step-by-step troubleshooting workflows

Common Error Codes Covered

This manual includes diagnostic procedures for common Audi fault codes applicable to the 2002 Audi A4.

Engine Codes

• P0102 – Mass Air Flow (MAF) Sensor Low Input
• P0171 – System Too Lean (Bank 1)
• P0300 – Random/Multiple Cylinder Misfire Detected
• P0322 – Engine Speed Sensor No Signal
• P1556 – Charge Pressure Control Negative Deviation (1.8T models)

Transmission Codes

• P0705 – Transmission Range Sensor Circuit Malfunction
• P0722 – Output Speed Sensor No Signal
• P0740 – Torque Converter Clutch Circuit Malfunction (automatic models)

ABS & Chassis Codes

• C0035 – Left Front Wheel Speed Sensor Fault
• C0040 – Right Front Wheel Speed Sensor Fault
• C1146 – Steering Angle Sensor Fault (ESP-equipped models)

Network Communication Codes

• U0100 – Lost Communication with Engine Control Module
• U0155 – Lost Communication with Instrument Cluster

Body Control Codes

• B1000 – Control Module Memory Error
• B1226 – Central Locking System Fault
• B11CF – Interior Lighting Circuit Fault

The manual also includes hundreds of manufacturer-specific diagnostic trouble codes, factory wiring diagrams, connector pinouts, ECU adaptation procedures, component testing specifications, and repair instructions.

Who Is This Manual For?

• Professional automotive workshops
• Audi dealership technicians
• Independent repair garages
• Mobile mechanics
• Automotive engineering students
• DIY enthusiasts

If you are servicing, maintaining, diagnosing, or repairing a 2002 Audi A4, this factory workshop manual provides the detailed repair procedures, wiring diagrams, technical specifications, and diagnostic information required to complete repairs accurately and to Audi factory standards.