2020 Audi S4 Avant Service and Repair Manual

This 2020 Audi S4 Avant Service and Repair Manual Covers

Engine & Drivetrain

• 3.0L TDI V6 with 48-volt mild hybrid system (market dependent)
• 3.0L Turbocharged TFSI V6 (EA839) engine (market dependent)
• Bosch engine management system diagnostics
• Turbocharger inspection and servicing
• Common rail diesel fuel system diagnostics (TDI models)
• Petrol direct injection system diagnostics (TFSI models)
• Engine cooling and lubrication system servicing
• Exhaust and emissions control system repairs
• 8-speed Tiptronic automatic transmission diagnostics and repair
• quattro permanent all-wheel drive system
• Self-locking centre differential servicing
• Front and rear differential servicing
• Driveshaft and axle repairs

Chassis & Suspension

• S Sport suspension diagnostics
• Adaptive damping suspension servicing (where equipped)
• Dynamic steering diagnostics (where equipped)
• Wheel alignment specifications
• Suspension component inspection and replacement
• Wheel bearing servicing

Braking Systems

• High-performance braking system
• Anti-lock Braking System (ABS)
• Electronic Stability Control (ESC)
• Electronic Brakeforce Distribution (EBD)
• Brake Assist
• Electronic Parking Brake (EPB)
• Brake hydraulic system servicing

Electrical & Wiring

• Complete factory wiring diagrams
• CAN Bus, FlexRay, and Ethernet diagnostics
• 48-volt electrical system diagnostics (TDI mild-hybrid models)
• Battery Energy Management (BEM)
• Charging and starting system diagnostics
• Body Control Module (BCM)
• Power distribution, fuse, and relay assignments
• Audi Virtual Cockpit diagnostics
• MMI Navigation Plus with MMI Touch diagnostics
• Matrix LED headlamp diagnostics (where equipped)

Driver Assistance Systems

• Adaptive Cruise Control (where equipped)
• Audi Active Lane Assist
• Audi Side Assist
• Rear Cross Traffic Assist (where equipped)
• Traffic Sign Recognition (where equipped)
• Parking System Plus
• Top View Camera System (where equipped)
• Driver assistance sensor calibration procedures

Air Conditioning & HVAC

• Three-zone automatic climate control diagnostics
• HVAC control module servicing
• Refrigerant recovery and recharge procedures
• Heating and ventilation system repairs

Body & Interior

• Advanced Key (where equipped)
• Power tailgate diagnostics
• Power seat adjustment with memory (where equipped)
• Door locking and window control diagnostics
• Interior trim removal and installation
• Exterior body repair procedures
• Airbag (SRS) system diagnostics

Diagnostics & Troubleshooting

• Audi ODIS diagnostic procedures
• Guided Fault Finding (GFF)
• Diagnostic Trouble Code (DTC) troubleshooting
• Control module coding and adaptations
• Component testing procedures
• Service interval reset procedures
• Post-repair calibration procedures

Common Error Codes Covered

This manual provides diagnostic and repair procedures for common Audi manufacturer-specific fault codes, including:

Engine Codes

• P0299 – Turbocharger Underboost
• P0300 – Random/Multiple Cylinder Misfire (TFSI)
• P00AF – Turbocharger Boost Control Performance
• P20EE – SCR NOx Catalyst Efficiency Below Threshold (TDI)
• P2459 – Diesel Particulate Filter Regeneration Frequency (TDI)

Transmission Codes

• P0726 – Engine Speed Input Circuit Performance
• P0741 – Torque Converter Clutch Performance
• P17BF – Transmission Control Module Malfunction

ABS & Chassis Codes

• C102D – Wheel Speed Sensor Fault
• C1046 – Steering Angle Sensor Calibration Required
• C10AC – Chassis Sensor Performance Fault

Network Communication Codes

• U0100 – Lost Communication With Engine Control Module
• U1113 – Function Restriction Due to Communication Fault
• U1121 – Missing Message on Data Bus

Driver Assistance System Codes

• C110300 – Radar Sensor Misalignment
• B200FF0 – Front Camera Calibration Required
• U023500 – Lost Communication With Driver Assistance Control Module

The manual also includes hundreds of additional Audi-specific diagnostic trouble codes, guided diagnostic routines, wiring diagrams, module coding procedures, and factory repair instructions.

Who Is This Manual For?

• Audi dealership technicians
• Independent European vehicle repair workshops
• Performance vehicle specialists
• Automotive technicians
• Fleet maintenance professionals
• Experienced DIY mechanics

If you are servicing, maintaining, diagnosing, or repairing a 2020 Audi S4 Avant, this factory workshop manual provides the complete procedures and technical information required to perform repairs to Audi factory standards.