Repair and Diagnosis

You are viewing the "split tree" of links. The tree is cut off at a certain depth to keep the page loading fast, but you may have to click multiple links to get to the content you want.
View "full tree" with all links on one page (will load slowly, but easier to use ctrl-f to search all pages)

Expand All (for easy ctrl-f) Collapse All

• Quick Lookups
  • Common Specs & Procedures
    • Common Specs And Procedure
  • DTC Index (2.9L & 3.0L)
  • Electrical Component Locations
    • S5 - Component Locations
    • S5 SPORTBACK - Component Locations
  • Fluids
  • Technical Bulletins
    • Safety Recalls
    • Technical Service Bulletins
  • Tire Fitment
  • Wiring Diagrams
    • OEM Wiring Diagram (CWGD)
    • System Wiring Diagrams - 4D Hatchback
    • Using lemon2025'S System Wiring Diagrams
• Accessories & Equipment
  • Anti-Theft Systems
    • Front Doors, Central Locking System
    • Interior Lights, Lamps And Switches
    • Interior Lights, Switches
  • Collision/Avoidance
    • Driver Assistance Systems Front Camera
    • Driver Assistance Systems Front Camera (Calibration)
    • Dynamic Steering System
    • Parallel Parking Assist System
    • Parking Aid System
    • Peripheral Camera System
    • Rearview Camera System
    • Wheels, Tires, Wheel Alignment (Suspension, Wheels, Steering)
  • Communication Devices
    • Communication (1 Of 2)
    • Communication (2 Of 2)
    • General, Technical Data (Communication)
  • Cruise Control Systems
    • Charging System (Battery, Starter, Generator) And Cruise Control (Battery & Adaptive Cruise Control)
    • Charging System (Battery, Starter, Generator) And Cruise Control (Battery & Charging)
    • Wheels, Tires, Wheel Alignment (Suspension, Wheels, Steering)
  • Drivers Assistance Systems - ADAS
    • Driver Assistance Systems Front Camera
    • Driver Assistance Systems Front Camera (Calibration)
    • Dynamic Steering System
    • Parallel Parking Assist System
    • Parking Aid System
    • Peripheral Camera System
    • Rearview Camera System
    • Wheels, Tires, Wheel Alignment (Suspension, Wheels, Steering)
  • Entertainment Systems
    • Communication
  • Exterior Lights
    • Exterior Lights, Lamps And Switches
    • Exterior Lights, Switches
  • Gauges & Instrument Panels
    • Instruments
  • Infotainment
    • Communication
    • Communication (Retrofitting)
  • Interior/Exterior Trim
    • Exterior Equipment
    • Interior Equipment
    • Interior Trim
  • Interior/Illumination Lights
    • Interior Lights, Lamps And Switches
    • Interior Lights, Switches
  • Mirrors
    • Exterior Equipment
  • Seats
    • Interior Equipment
    • Seat Frames
    • Seat Upholstery, Covers
  • Warning Systems
    • Communication
  • Window Motors & Regulators
    • Exterior Equipment
    • Front Doors, Central Locking System
    • Glass, Window Regulators
    • Rear Doors
  • Wiper/Washer Systems
  • Wiring System (Data Link Connectors, Pwr Dist., Grnd Dist.)
    • Wires
    • Wiring
• Body & Frame
  • Door Locks
    • Front Doors, Central Locking System
    • Interior Lights, Lamps And Switches
    • Interior Lights, Switches
  • Exterior Body Panels
    • Body Front
    • Bumpers
    • Exterior Equipment
    • Front Doors, Central Locking System
    • General, Technical Data (Body Exterior)
    • General, Technical Data Body Exterior
    • Hood, Lids
    • Rear Doors
  • Exterior/Interior Trim
    • Exterior Equipment
    • Interior Equipment
    • Interior Trim
  • Mirrors
    • Exterior Equipment
  • Seats
    • Interior Equipment
    • Seat Frames
    • Seat Upholstery, Covers
  • Sun Roof/T-Top/Convertible Top
    • Convertible Top
    • Sunroof
  • Windows
    • Exterior Equipment
    • Front Doors, Central Locking System
    • Glass, Window Regulators
    • Rear Doors
• Brakes
  • Anti-Lock Brakes
    • Antilock Brake System
  • Mechanical - Hydraulic
    • General, Technical Data (Brake System)
    • Hydraulic Components (Brake System)
    • Mechanical Components (Brake System)
  • Parking Brake System
    • General, Technical Data (Brake System)
    • Mechanical Components (Brake System)
  • Traction Control
    • Antilock Brake System
• Drivelines & Axles
  • Axle Shafts
    • Final Drive, Differential 8-Speed Automatic Transmission
    • Final Drive, Differential Rear Final Drive
    • Final Drive, Differential Servicing - 7-Speed Dual Clutch Transmission
    • Final Drive, Differential Servicing - 8-Speed Automatic Transmission
    • Front Suspension
    • General, Technical Data Rear Final Drive
    • Rear Suspension
  • Differentials & Drive Axles
    • Final Drive, Differential 7-Speed Dual Clutch Transmission
    • Final Drive, Differential 8-Speed Automatic Transmission
    • Final Drive, Differential Rear Final Drive
    • Final Drive, Differential Servicing - 7-Speed Dual Clutch Transmission
    • Final Drive, Differential Servicing - 8-Speed Automatic Transmission
    • Gears, Shafts 7-Speed Dual Clutch Transmission
    • Gears, Shafts Servicing - 7-Speed Dual Clutch Transmission
    • General, Technical Data Rear Final Drive
• Electrical
  • Body Electrical
    • General, Technical Data (Electrical System)
    • Wires
    • Wiring
  • Charging Systems
    • Charging System (Battery, Starter, Generator) And Cruise Control
    • Charging System (Battery, Starter, Generator) And Cruise Control (Battery & Adaptive Cruise Control)
    • Charging System (Battery, Starter, Generator) And Cruise Control (Battery & Charging)
    • General, Technical Data (Electrical System)
    • General, Technical Data Electrical Equipment
  • Component Locations
    • S5 - Component Locations
    • S5 SPORTBACK - Component Locations
  • Fuses & Circuit Breakers
    • Wires
    • Wiring
  • Gauges
    • Instruments
  • Motors, Switches, Relays
    • General, Technical Data (Electrical System)
    • Wires
    • Wiring
  • Wiring Diagrams
    • OEM Wiring Diagram (CWGD)
    • System Wiring Diagrams - 4D Hatchback
    • Using lemon2025'S System Wiring Diagrams
• Engine Mechanical
  • Blowers, Superchargers & Turbochargers
    • Turbocharger, Supercharger (3.0L & 2.9L)
  • Cooling Fan
    • Cooling System (3.0L & 2.9L)
    • Cooling System Servicing (3.0L& 2.9L)
  • Cooling System (Mechanical)
    • Cooling System (3.0L & 2.9L)
    • Cooling System Servicing (3.0L& 2.9L)
  • Exhaust
    • Exhaust System, Emission Controls (3.0L & 2.9L)
    • Exhaust System, Emission Controls Servicing (3.0L & 2.9L)
    • General, Technical Data (3.0L & 2.9L)
    • General, Technical Data (Fuel Supply System)
    • General, Technical Data Servicing 3.0L & 2.9L
    • OEM Wiring Diagram (CWGD)
  • Fuel System
    • Fuel Supply
    • Fuel Supply (Fuel System EVAP Leak Test)
    • General, Technical Data (3.0L & 2.9L)
    • General, Technical Data (Fuel Supply System)
    • General, Technical Data Fuel Supply System
    • General, Technical Data Servicing 3.0L & 2.9L
    • MULTIPORT Fuel Injection (3.0L & 2.9L)
    • MULTIPORT Fuel Injection Servicing (3.0L & 2.9L)
    • OEM Wiring Diagram (CWGD)
  • Lubrication System
    • General, Technical Data (3.0L & 2.9L)
    • General, Technical Data (Fuel Supply System)
    • General, Technical Data (Oil Gauge Tester T40178 Service Values)
    • General, Technical Data Oil Gauge Tester T40178 Service Values
    • General, Technical Data Servicing 3.0L & 2.9L
    • Lubrication (3.0L & 2.9L)
    • Lubrication Servicing (3.0L & 2.9L)
    • OEM Wiring Diagram (CWGD)
  • Mechanical
    • Crankshaft, Cylinder Block (3.0L & 2.9L)
    • Crankshaft, Cylinder Block Servicing (3.0L & 2.9L)
    • Cylinder Head, VALVETRAIN (3.0L & 2.9L)
    • Cylinder Head, VALVETRAIN Servicing (3.0L & 2.9L)
    • Engine Assembly (3.0L & 2.9L)
    • Engine Assembly Servicing (3.0L & 2.9L)
    • General, Technical Data (3.0L & 2.9L)
    • General, Technical Data (Fuel Supply System)
    • General, Technical Data Servicing 3.0L & 2.9L
    • OEM Wiring Diagram (CWGD)
• Engine Performance
  • Emissions
    • Emission Applications
    • Emission Control Abbreviations
    • State Emission Standards - Diesel
    • State Emission Standards - Gas
  • Engine Control Systems
    • Generic Scan Tool (3.0L & 2.9L)
    • Generic Scan Tool (3.0L & 2.9L) (1 Of 3)
    • Generic Scan Tool (3.0L & 2.9L) (2 Of 3)
    • Generic Scan Tool (3.0L & 2.9L) (3 Of 3)
    • Generic Scan Tool (3.0L) - Engine DTC Tables
    • Generic Scan Tool (3.0L) - Transmission DTC Tables & Diagnostic Procedures
    • Generic Scan Tool (3.0L) (Engine DTC Tables)
    • Generic Scan Tool (3.0L) (Transmission DTC Tables & Diagnostic Procedures)
  • Fuel Delivery
    • Fuel Supply
    • Fuel Supply (Fuel System EVAP Leak Test)
    • General, Technical Data (3.0L & 2.9L)
    • General, Technical Data (Fuel Supply System)
    • General, Technical Data Fuel Supply System
    • General, Technical Data Servicing 3.0L & 2.9L
    • MULTIPORT Fuel Injection (3.0L & 2.9L)
    • MULTIPORT Fuel Injection Servicing (3.0L & 2.9L)
    • OEM Wiring Diagram (CWGD)
  • Ignition System
    • General, Technical Data (3.0L & 2.9L)
    • General, Technical Data (Fuel Supply System)
    • General, Technical Data Servicing 3.0L & 2.9L
    • Ignition/Glow Plug System (3.0L & 2.9L)
    • Ignition/Glow Plug System Servicing (3.0L & 2.9L)
    • OEM Wiring Diagram (CWGD)
  • Remove, Overhaul & Install
    • General, Technical Data (3.0L & 2.9L)
    • General, Technical Data (Fuel Supply System)
    • General, Technical Data Servicing 3.0L & 2.9L
    • OEM Wiring Diagram (CWGD)
  • System
    • Generic Scan Tool (3.0L & 2.9L)
    • Generic Scan Tool (3.0L & 2.9L) (1 Of 3)
    • Generic Scan Tool (3.0L & 2.9L) (2 Of 3)
    • Generic Scan Tool (3.0L & 2.9L) (3 Of 3)
    • Generic Scan Tool (3.0L) - Engine DTC Tables
    • Generic Scan Tool (3.0L) - Transmission DTC Tables & Diagnostic Procedures
    • Generic Scan Tool (3.0L) (Transmission DTC Tables & Diagnostic Procedures)
  • Testing & Diagnosis
    • Generic Scan Tool (3.0L & 2.9L)
    • Generic Scan Tool (3.0L & 2.9L) (1 Of 3)
    • Generic Scan Tool (3.0L & 2.9L) (2 Of 3)
    • Generic Scan Tool (3.0L & 2.9L) (3 Of 3)
    • Generic Scan Tool (3.0L) - Engine DTC Tables
    • Generic Scan Tool (3.0L) - Transmission DTC Tables & Diagnostic Procedures
    • Generic Scan Tool (3.0L) (Transmission DTC Tables & Diagnostic Procedures)
  • Tune-Up
    • General, Technical Data (3.0L & 2.9L)
    • General, Technical Data (Fuel Supply System)
    • General, Technical Data Servicing 3.0L & 2.9L
    • Ignition/Glow Plug System (3.0L & 2.9L)
    • Ignition/Glow Plug System Servicing (3.0L & 2.9L)
    • OEM Wiring Diagram (CWGD)
• General Information
  • Abbreviations
    • Commonly Used Abbreviations - General Information
    • Emission Control Abbreviations
  • Basic Trouble Shooting
    • Basic Trouble Shooting - General Information
    • Commonly Used Abbreviations - General Information
    • Emission Control Abbreviations
    • Engine Performance - Trouble Shooting - General Information
  • Brakes
    • Anti-Lock Brake Safety Precautions - General Information
    • Map - Brake Systems
    • Map - Routine Inspection Reference Guide
  • Check Lists
    • Symptom Check List Worksheet - General Information
  • Driveline/Axles
    • Drive Axle Noise Diagnosis - General Information
    • Gear Tooth Contact Patterns - General Information
    • Map - Drive Train & Transmission
    • Trouble Shooting - Clutches - General Information
  • DTC Index (2.9L & 3.0L)
  • Electrical
    • Map - Electrical Systems
    • Using lemon2025'S System Wiring Diagrams
  • Engine
    • Engine Overhaul Procedures - General Information
    • General Cooling System Service - General Information
  • Engine Performance
    • Electrostatic Discharge Warning - General Information
    • Engine Performance Diagnostic Routine Outline - General Information
    • Engine Performance Safety Precautions
    • Map - Engine Performance & Maintenance
    • Parasitic Load Explanation & Test Procedures - General Information
    • State Emission Standards - Diesel
    • State Emission Standards - Gas
    • Waveforms - Injector Pattern Tutorial - General Information
  • Map - Exhaust Systems
  • Heating, Ventilation & A/C (HVAC)
    • Map - Heating, Ventilation, & Air Conditioning
  • Hoist/Jack
    • General Information
  • Identification
    • CANADIAN Model Cross-Reference
    • General Information
  • Metric Conversions
    • Engine Displacement Conversion Table - ECAT
    • Metric Conversions
  • OEM General Information
  • Reset Procedures
    • General Information
    • Maintenance Reminder Light (Reset Procedures)
  • Specifications Index
    • Common Specs And Procedure
  • Steering
    • Map - Steering, Suspension, Wheel Alignment, Wheels & Tires
    • Wheel Alignment Theory & Operation - General Information
  • Towing
    • General Information
  • Trouble Shooting - Manual Transmission - General Information
• Heating, Ventilation & A/C (HVAC)
  • A/C Compressor
    • Air Conditioning
    • Air Conditioning (Refrigerant R1234YF Servicing) (Refrigerant Circuit)
    • Air Conditioning (Refrigerant R1234YF Servicing) (Tools & Testing)
    • Air Conditioning (Refrigerant R134A Servicing) (General Information)
    • Air Conditioning (Refrigerant R134A Servicing) (Refrigerant Circuit Components)
  • General Servicing
    • Air Conditioning
    • Air Conditioning (Refrigerant R1234YF Servicing) (Refrigerant Circuit)
    • Air Conditioning (Refrigerant R1234YF Servicing) (Tools & Testing)
    • Air Conditioning (Refrigerant R134A Servicing) (General Information)
    • Air Conditioning (Refrigerant R134A Servicing) (Refrigerant Circuit Components)
    • General, Technical Data (HVAC)
    • General, Technical Data (Refrigerant R1234YF Servicing)
    • General, Technical Data Heating, Ventilation And Air Conditioning
  • HVAC Control Systems
    • Air Conditioning
    • Air Conditioning (Refrigerant R1234YF Servicing) (Refrigerant Circuit)
    • Air Conditioning (Refrigerant R1234YF Servicing) (Tools & Testing)
    • Air Conditioning (Refrigerant R134A Servicing) (General Information)
    • Air Conditioning (Refrigerant R134A Servicing) (Refrigerant Circuit Components)
    • General, Technical Data (HVAC)
    • General, Technical Data (Refrigerant R1234YF Servicing)
    • General, Technical Data Heating, Ventilation And Air Conditioning
    • Heating
    • Heating, Ventilation
• Maintenance
  • Procedures
    • General Information
    • Maintenance Reminder Light (Reset Procedures)
    • Maintenance, Diagnosis (2017-18 Fluid Capacity Tables)
    • Maintenance, Diagnosis (Engine Oil: Specialty Engine Oils)
    • Maintenance, Diagnosis (My 2018 AUDI Maintenance Schedule)
    • Maintenance, Diagnosis 2018 AUDI Service
    • Maintenance, Diagnosis Fluid Capacity Tables
  • Schedule
    • Maintenance, Diagnosis 2018 AUDI Service
• Restraints
  • Air Bag, SRS
    • General, Technical Data (Body Interior)
    • General, Technical Data Body Interior
    • Passenger Protection, Airbags, Seat Belts
  • Passive Restraints
    • General, Technical Data (Body Interior)
    • General, Technical Data Body Interior
    • Interior Equipment
    • Passenger Protection, Airbags, Seat Belts
• Steering
  • Electronic Steering
    • Wheels, Tires, Wheel Alignment (Suspension, Wheels, Steering)
  • Manual Steering
  • Power Steering
  • Steering Column
  • Steering Gear
    • General, Technical Data (Suspension)
    • Steering
  • Steering Linkage
• Suspension
  • Electronic Suspension
    • Self-Leveling Suspension
  • Front Suspension
    • Front Suspension
    • General, Technical Data (Suspension)
    • General, Technical Data Suspension, Wheels, Steering
  • Rear Suspension
    • General, Technical Data (Suspension)
    • General, Technical Data Suspension, Wheels, Steering
    • Rear Suspension
  • Wheel Alignment
    • General, Technical Data (Suspension)
    • Wheels, Tires, Wheel Alignment (Suspension, Wheels, Steering)
  • Wheels & Tire System
    • General, Technical Data (Suspension)
    • General, Technical Data Suspension, Wheels, Steering
    • Wheels, Tires, Wheel Alignment (Suspension, Wheels, Steering)
    • Wheels, Tires, Wheel Alignment (Wheel And Tire Guide)
• Transmission
  • Automatic Trans
    • Gears, Shafts 7-Speed Dual Clutch Transmission
    • Gears, Shafts Servicing - 7-Speed Dual Clutch Transmission
    • General, Technical Data 7-Speed Dual Clutch Transmission
    • General, Technical Data 8-Speed Automatic Transmission
    • General, Technical Data Rear Final Drive
    • General, Technical Data Servicing - 7-Speed Dual Clutch Transmission
    • General, Technical Data Servicing - 8-Speed Automatic Transmission
    • Torque Converter 8-Speed Automatic Transmission
    • Torque Converter Servicing - 8-Speed Automatic Transmission
  • Clutch
    • Clutch 7-Speed Dual Clutch Transmission
    • Clutch Servicing - 7-Speed Dual Clutch Transmission
  • Manual Trans
    • Final Drive, Differential 7-Speed Dual Clutch Transmission
    • Final Drive, Differential 8-Speed Automatic Transmission
    • Final Drive, Differential Rear Final Drive
    • Final Drive, Differential Servicing - 7-Speed Dual Clutch Transmission
    • Final Drive, Differential Servicing - 8-Speed Automatic Transmission
    • Gears, Hydraulic Controls 8-Speed Automatic Transmission
    • Gears, Hydraulic Controls Servicing - 8-Speed Automatic Transmission
    • Gears, Shafts 7-Speed Dual Clutch Transmission
    • Gears, Shafts Servicing - 7-Speed Dual Clutch Transmission
  • Transmission Control Systems
    • Controls, Housing 7-Speed Dual Clutch Transmission
    • Controls, Housing 8-Speed Automatic Transmission
    • Controls, Housing Servicing - 7-Speed Dual Clutch Transmission
    • Final Drive, Differential 8-Speed Automatic Transmission
    • Final Drive, Differential Servicing - 7-Speed Dual Clutch Transmission
    • Generic Scan Tool (3.0L & 2.9L)
    • Generic Scan Tool (3.0L & 2.9L) (1 Of 3)
    • Generic Scan Tool (3.0L & 2.9L) (2 Of 3)
    • Generic Scan Tool (3.0L & 2.9L) (3 Of 3)
    • Generic Scan Tool (3.0L) - Engine DTC Tables
    • Generic Scan Tool (3.0L) - Transmission DTC Tables & Diagnostic Procedures
    • Generic Scan Tool (3.0L) (Transmission DTC Tables & Diagnostic Procedures)
• External Pages