2020 Audi A4 Avant Service and Repair Manual

This 2020 Audi A4 Avant Service and Repair Manual Covers

Engine & Drivetrain

• 2.0L TFSI turbocharged petrol engine service and repair
• 2.0L TFSI 12V Mild Hybrid (MHEV) system diagnostics (where equipped)
• 2.0L TDI turbo diesel engine service and repair
• 3.0L TDI V6 engine servicing (selected markets)
• Fuel injection and turbocharger diagnostics
• Engine cooling system servicing
• Engine lubrication system repairs
• Exhaust and emissions control system diagnostics
• Start/Stop system diagnostics
• 6-speed manual transmission servicing (selected markets)
• 7-speed S tronic dual-clutch transmission diagnostics and repair
• 8-speed Tiptronic automatic transmission servicing (selected V6 models)
• quattro all-wheel drive system servicing (where equipped)
• Driveshaft, propeller shaft, differential, and CV joint repairs

Braking Systems

• Hydraulic brake system servicing
• Anti-lock Braking System (ABS) diagnostics
• Electronic Stability Control (ESC) diagnostics
• Electronic Parking Brake (EPB) servicing
• Auto Hold system diagnostics
• Brake Assist system diagnostics
• Brake pad, disc, and caliper replacement procedures
• Brake hydraulic system bleeding

Chassis & Suspension

• Front five-link suspension repairs
• Rear five-link suspension servicing
• Dynamic suspension diagnostics (where equipped)
• Adaptive damper suspension servicing (where equipped)
• Dynamic steering diagnostics (where equipped)
• Wheel alignment specifications
• Wheel bearing replacement procedures
• Suspension component inspection and troubleshooting

Electrical & Wiring

• Complete factory wiring diagrams
• Battery Energy Management (BEM) diagnostics
• 12-volt electrical system servicing
• Mild Hybrid electrical system diagnostics (where equipped)
• CAN Bus, LIN Bus, FlexRay, and Ethernet communication diagnostics
• Gateway control module diagnostics
• Body Control Module (BCM) diagnostics
• Audi Virtual Cockpit diagnostics (where equipped)
• Audi MMI Navigation Plus diagnostics
• Smartphone interface, Bluetooth®, USB, and wireless charging diagnostics (where equipped)
• LED and Matrix LED headlamp diagnostics (where equipped)

Air Conditioning & HVAC

• Three-zone automatic climate control diagnostics (where equipped)
• Air conditioning compressor servicing
• Refrigerant recovery and recharge procedures
• HVAC control module diagnostics
• Air quality sensor testing
• Heating and ventilation system repairs

Body & Interior

• Interior trim removal and installation
• Dashboard servicing procedures
• Door control module diagnostics
• Power tailgate diagnostics and repair
• Tailgate struts and latch servicing
• Roof rail component servicing
• Power window and central locking repairs
• Exterior lighting system servicing
• Airbag and occupant restraint system diagnostics
• Electrically adjustable and memory seat repairs (where equipped)
• Body panel alignment and repair information

Driver Assistance Systems

• Audi Pre Sense City diagnostics (where equipped)
• Adaptive Cruise Control diagnostics (where equipped)
• Audi Active Lane Assist diagnostics (where equipped)
• Audi Side Assist (Blind Spot Monitoring) diagnostics (where equipped)
• Rear Cross Traffic Assist diagnostics (where equipped)
• Traffic Sign Recognition diagnostics (where equipped)
• Parking System Plus diagnostics
• Top View camera diagnostics (where equipped)
• Front camera calibration procedures
• Radar sensor calibration
• Ultrasonic parking sensor diagnostics

Diagnostics & Troubleshooting

• ODIS factory diagnostic procedures
• Guided fault-finding routines
• Diagnostic Trouble Code (DTC) lookup procedures
• ECU coding and adaptation procedures
• Software update procedures
• Component protection diagnostics
• Sensor and actuator testing
• Step-by-step troubleshooting workflows

Common Error Codes Covered

This manual includes diagnostic procedures for common Audi fault codes applicable to the 2020 Audi A4 Avant.

Engine Codes

• P0299 – Turbocharger Underboost Condition
• P0171 – System Too Lean (Bank 1)
• P0300 – Random/Multiple Cylinder Misfire Detected
• P00AF – Turbocharger Boost Control Module Performance
• P2B61 – Charge Air Cooling System Performance

Transmission Codes

• P0726 – Engine Speed Input Circuit Range/Performance
• P1735 – S tronic Clutch Adaptation Fault
• P17BF – Hydraulic Pump Protection Fault

ABS & Chassis Codes

• C0031 – Left Front Wheel Speed Sensor Fault
• C10AC – Electronic Parking Brake Malfunction
• C1146 – Steering Angle Sensor Calibration Fault

Network Communication Codes

• U0100 – Lost Communication with ECM/PCM
• U1113 – Function Restriction Due to Missing Message
• U1123 – Data Bus Communication Fault

Body Control & Driver Assistance Codes

• B2000 – Control Module Internal Malfunction
• B126A – Front Camera Calibration Required
• C1103 – Radar Sensor Misalignment
• C1116 – Lane Assist Camera Fault

The manual also includes hundreds of manufacturer-specific diagnostic trouble codes, wiring diagrams, ECU coding procedures, guided diagnostics, calibration instructions, and repair information.

Who Is This Manual For?

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

If you are servicing, maintaining, diagnosing, or repairing a 2020 Audi A4 Avant, this factory workshop manual provides the detailed repair procedures, wiring diagrams, technical specifications, diagnostic information, and calibration procedures required to maintain the vehicle to Audi factory standards.