Repair and Diagnosis

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• Quick Lookups
  • Common Specs & Procedures (A7 QUATTRO/S7/RS 7)
  • DTC Index (General Information)
  • Electrical Component Locations
    • A7 QUATTRO - Component Locations
  • Fluids
  • Technical Bulletins
    • Safety Recalls
    • Technical Service Bulletins
  • Tire Fitment
  • Wiring Diagrams
    • System Wiring Diagrams
    • Using lemon2025'S System Wiring Diagrams
• Accessories & Equipment
  • Anti-Theft Systems
    • Front Doors System & Central Locking System (Service Information)
    • Immobilizer System & Trailer Hitch Systems (General Information)
    • Interior Lighting System (General & Service Information)
  • Collision/Avoidance
    • Communication System (Service Information)
    • Electrical System (General Information - Battery, Starter, Generator, Cruise Control)
    • Interior Lighting System (General & Service Information)
    • Wheels & Tires System (General & Service Information)
  • Cruise Control Systems
    • Electrical System (General Information - Battery, Starter, Generator, Cruise Control)
    • Wheels & Tires System (General & Service Information)
  • Drivers Assistance Systems - ADAS
    • Communication System (Service Information)
    • Electrical System (General Information - Battery, Starter, Generator, Cruise Control)
    • Interior Lighting System (General & Service Information)
    • Wheels & Tires System (General & Service Information)
  • Entertainment Systems
    • Communication System (Service Information)
    • Interior Lighting System (General & Service Information)
  • Exterior Lights
    • Exterior Lighting System (Precautions)
    • Exterior Lighting System (Service Information)
  • Gauges & Instrument Panels
    • Horn System & Instrument System (Service Information)
    • Interior Equipment System (Service Information)
  • Headlights
    • Electrical System (Precautions & General Information)
  • Horns
    • Horn System & Instrument System (Service Information)
  • Infotainment
    • Communication System (General Information)
    • Communication System (Service Information)
    • Interior Lighting System (General & Service Information)
  • Interior/Exterior Trim
    • Exterior Equipment System (Service Information)
    • Exterior Trim System (Precautions & General Information)
    • Interior Equipment System (Service Information)
    • Interior Trim System (Service Information)
    • Seat Frame System (Service Information)
  • Interior/Illumination Lights
    • Interior Lighting System (General & Service Information)
  • Seats
    • Seat Frame System (Service Information)
    • Seat Upholstery & Covers System (Service Information)
  • Warning Systems
    • Communication System (Service Information)
  • Window Motors & Regulators
    • Exterior Equipment System (Service Information)
    • Front Doors System & Central Locking System (Service Information)
    • Rear Doors System (Service Information)
    • Window & Glass System (Service Information)
  • Wiper/Washer Systems
    • Windshield Washer System (Service Information)
    • Wiper & Washer Systems (Service Information)
• Body & Frame
  • Door Locks
    • Front Doors System & Central Locking System (Service Information)
    • Immobilizer System & Trailer Hitch Systems (General Information)
    • Interior Lighting System (General & Service Information)
  • Exterior Body Panels
    • Body Front System (Service Information)
    • Exterior Body Panels (Hood, Lids) (Service Information)
    • Exterior Bumpers System (Service Information)
    • Exterior Equipment System (Service Information)
    • Front Doors System & Central Locking System (Service Information)
    • Rear Doors System (Service Information)
  • Exterior/Interior Trim
    • Exterior Equipment System (Service Information)
    • Exterior Trim System (Precautions & General Information)
    • Interior Equipment System (Service Information)
    • Interior Trim System (Service Information)
    • Seat Frame System (Service Information)
  • Frames, Subframes & Crossmembers
    • Front Suspension System (Service Information)
    • Rear Suspension System (Service Information)
  • Seats
    • Seat Frame System (Service Information)
    • Seat Upholstery & Covers System (Service Information)
  • Sun Roof/T-Top/Convertible Top
    • Sunroof System (Service Information)
  • Towing Systems
    • Immobilizer System & Trailer Hitch Systems (General Information)
  • Windows
    • Exterior Equipment System (Service Information)
    • Front Doors System & Central Locking System (Service Information)
    • Rear Doors System (Service Information)
    • Window & Glass System (Service Information)
• Brakes
  • Anti-Lock Brakes
    • Antilock Brake System (Service & General Information)
  • Brakes Control Systems
    • Antilock Brake System (Service & General Information)
    • Brake System (Precautions & General Information)
    • Brake System Hydraulic Components (Service Information)
    • Brake System Mechanical Components (Service Information)
  • Mechanical - Hydraulic
    • Brake System (Precautions & General Information)
    • Brake System Hydraulic Components (Service Information)
    • Brake System Mechanical Components (Service Information)
  • Parking Brake System
    • Brake System Mechanical Components (Service Information)
  • Traction Control
    • Antilock Brake System (Service & General Information)
• Drivelines & Axles
  • Axle Shafts
    • Differential System (General & Service Information - 0B5A, 0BKA)
    • Differential System (General & Service Information - 8-Speed - 0BK)
    • Differential System (Service Information - 8-Speed - 0BKA)
    • Front Suspension System (Service Information)
    • Rear Suspension System (Service Information)
  • Differentials & Drive Axles
    • Differential System (General & Service Information - 0B5A, 0BKA)
    • Differential System (General & Service Information - 8-Speed - 0BK)
    • Differential System (General & Service Information - Rear Final Drive 0B5A, 0BKA Sport Differential)
    • Differential System (Service Information - 8-Speed - 0BKA)
    • Final Drive System & Transmission System (General Information - 0B5A, 0BKA - 1 Of 2)
    • Final Drive System & Transmission System (General Information - 0B5A, 0BKA - 2 Of 2)
    • Rear Suspension System (Service Information)
    • Transmission System & AWD System (General Information - 0BKA, 0BK)
  • Driveshaft & Universal Joints
    • Differential System (General & Service Information - Rear Final Drive 0B5A, 0BKA Sport Differential)
• Electrical
  • Body Electrical
    • Electrical System (Precautions & General Information)
    • System Wiring (General & Service Information)
    • System Wiring (General Information)
  • Charging Systems
    • Charging System (General Information)
    • Electrical System (General Information - Battery, Starter, Generator, Cruise Control)
  • A7 QUATTRO - Component Locations
  • Fuses & Circuit Breakers
    • System Wiring (General & Service Information)
  • Gauges
    • Horn System & Instrument System (Service Information)
    • Interior Equipment System (Service Information)
  • Horns
    • Horn System & Instrument System (Service Information)
  • Motors, Switches, Relays
    • Electrical System (Precautions & General Information)
    • System Wiring (General & Service Information)
    • System Wiring (General Information)
  • Electrical System (General Information - Battery, Starter, Generator, Cruise Control)
  • Wiring Diagrams
    • System Wiring Diagrams
    • Using lemon2025'S System Wiring Diagrams
• Engine Mechanical
  • Blowers, Superchargers & Turbochargers
    • Fuel System (General Information)
    • Fuel System (Service Information - CEUC, CRDB, CTUA, CTGE, CREC, CWUB, CWUC, CREH)
    • Supercharger System (Service Information - 3.0L - CREC, CREH)
  • Cooling Fan
    • Engine Cooling System (Service Information - 3.0L - CREC, CREH)
  • Cooling System (Mechanical)
    • Engine Cooling System (Service Information - 3.0L - CREC, CREH)
  • Exhaust System & Emission Controls System (Service Information - 3.0L - CREC, CREH)
  • Fuel System
    • Engine System (Precautions & General Information - 3.0L - CREC, CREH)
    • Fuel Injection System (Gasoline - Service Information - 3.0L - CREC, CREH)
    • Fuel System & Start/Stop System (General Information - CEUC, CRDB, CTUA, CTGE, CREC, CWUB, CWUC, CREH)
  • Engine Lubrication System (Service Information - 3.0L - CREC, CREH)
  • Mechanical
    • Engine System (Assembly - Service Information - 3.0L - CREC, CREH)
    • Engine System (Crankshaft & Cylinder Block - Service Information - 3.0L CREC, CREH)
    • Engine System (Cylinder Head & VALVETRAIN - Service Information - 3.0L - CREC, CREH)
    • Engine System (Precautions & General Information - 3.0L - CREC, CREH)
    • Fuel System & Start/Stop System (General Information - CEUC, CRDB, CTUA, CTGE, CREC, CWUB, CWUC, CREH)
    • Oil Gauge Tester System (General Information)
  • Electrical System (General Information - Battery, Starter, Generator, Cruise Control)
• Engine Performance
  • Adjustment
    • Oil Gauge Tester System (General Information)
  • Emissions
    • Emission Applications
    • Emission Control Abbreviations
    • State Emission Standards - Diesel
    • State Emission Standards - Gas
  • Engine Control Systems
    • Engine System (Precautions & General Information - 3.0L - CREC, CREH)
  • Fuel Delivery
    • Engine System (Precautions & General Information - 3.0L - CREC, CREH)
    • Fuel Injection System (Gasoline - Service Information - 3.0L - CREC, CREH)
    • Fuel System & Start/Stop System (General Information - CEUC, CRDB, CTUA, CTGE, CREC, CWUB, CWUC, CREH)
  • Ignition System
    • Engine System (Precautions & General Information - 3.0L - CREC, CREH)
    • Ignition System (Service Information - 3.0L - CREC, CREH)
  • Specifications
    • Firing Order & Cylinder Identification
  • Tune-Up
    • Engine System (Precautions & General Information - 3.0L - CREC, CREH)
    • Ignition System (Service Information - 3.0L - CREC, CREH)
• 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 (General Information)
  • 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
    • Maintenance System (General & Service Information - 1 Of 2)
    • Maintenance System (General & Service Information - 2 Of 2)
  • Identification
    • CANADIAN Model Cross-Reference
    • Maintenance System (General & Service Information - 1 Of 2)
    • Maintenance System (General & Service Information - 2 Of 2)
    • Transmission System (General Information - 8-Speed - 0BKA)
  • Metric Conversions
    • Engine Displacement Conversion Table - ECAT
    • Metric Conversions
  • OEM General Information
    • Automatic Stop/Start Disable
    • Exterior Lighting System (Precautions)
    • Maintenance System (General & Service Information - 1 Of 2)
    • Maintenance System (General & Service Information - 2 Of 2)
  • Reset Procedures
    • Maintenance Reminder Light (Reset Procedures)
    • Maintenance System (General & Service Information - 1 Of 2)
    • Maintenance System (General & Service Information - 2 Of 2)
    • Tire Pressure Monitor Systems
  • Specifications Index
    • Common Specs & Procedures (A7 QUATTRO/S7/RS 7)
  • Steering
    • Map - Steering, Suspension, Wheel Alignment, Wheels & Tires
    • Wheel Alignment Theory & Operation - General Information
  • Towing
    • Maintenance System (General & Service Information - 1 Of 2)
    • Maintenance System (General & Service Information - 2 Of 2)
  • Traction Control Disable Procedures
  • Trouble Shooting - Manual Transmission - General Information
• Heating, Ventilation & A/C (HVAC)
  • A/C Compressor
    • Climate Control System (Service Information 1 Of 2)
  • General Servicing
    • Climate Control System (General & Service Information - Refrigerant R1234YF Servicing 1 Of 2)
    • Climate Control System (General & Service Information - Refrigerant R1234YF Servicing 2 Of 2)
    • Climate Control System (General & Service Information - Refrigerant R134A Servicing 1 Of 2)
    • Climate Control System (General & Service Information - Refrigerant R134A Servicing 2 Of 2)
    • Climate Control System (General Information - CEUC, CTUA, CEUC, CRDB, CPNB, CREC, CTGE, CWUC, CREH, CWUB)
    • Climate Control System (Refrigerant R134A Servicing)
    • Climate Control System (Service Information 1 Of 2)
  • HVAC Control Systems
    • Climate Control System (General & Service Information - Refrigerant R1234YF Servicing 1 Of 2)
    • Climate Control System (General & Service Information - Refrigerant R134A Servicing 1 Of 2)
    • Climate Control System (General & Service Information - Refrigerant R134A Servicing 2 Of 2)
    • Climate Control System (General Information - CEUC, CTUA, CEUC, CRDB, CPNB, CREC, CTGE, CWUC, CREH, CWUB)
    • Climate Control System (Refrigerant R134A Servicing)
    • Climate Control System (Service Information 1 Of 2)
    • Climate Control System (Service Information 2 Of 2)
• Maintenance
  • Procedures
    • Fluid Capacity Tables (2017-18)
    • Maintenance Intervals
    • Maintenance Reminder Light (Reset Procedures)
    • Maintenance Schedule
    • Maintenance System (General & Service Information - 1 Of 2)
    • Maintenance System (General & Service Information - 2 Of 2)
• Restraints
  • Air Bag, SRS
    • Supplemental Restraint System (General & Specification Information)
    • Supplemental Restraint System (Service Information)
  • Passive Restraints
    • Supplemental Restraint System (General & Specification Information)
    • Supplemental Restraint System (Service Information)
• Steering
  • Electronic Steering
    • Wheels & Tires System (General & Service Information)
  • Manual Steering
    • Steering System (General & Service Information)
  • Power Steering
    • Steering System (General & Service Information)
  • Steering Column
    • Steering System (General & Service Information)
  • Steering Control Systems
    • Steering System (General & Service Information)
  • Steering Gear
    • Steering System (General & Service Information)
  • Steering Linkage
    • Steering System (General & Service Information)
• Suspension
  • Electronic Suspension
    • Self-Leveling Suspension System (Service Information)
  • Front Suspension System (Service Information)
  • Rear Suspension System (Service Information)
  • Suspension Control Systems
    • Self-Leveling Suspension System (Service Information)
  • Wheel Alignment
    • AUDI Wheel Alignment Specifications - A7
    • AUDI Wheel Alignment Specifications - A7 QUATTRO
    • Wheel & Tire Guide (General Information)
    • Wheels & Tires System (General & Service Information)
  • Wheels & Tire System
    • Wheel & Tire Guide (General Information)
    • Wheels & Tires System (General & Service Information)
    • Wheels & Tires System (General & Technical Specifications)
    • Wheels & Tires System (General Information & Technical Data)
• Transmission
  • Automatic Trans
    • Differential System (General & Service Information - 0B5A, 0BKA)
    • Differential System (Service Information - 8-Speed - 0BKA)
    • Final Drive System & Transmission System (General Information - 0B5A, 0BKA - 1 Of 2)
    • Final Drive System & Transmission System (General Information - 0B5A, 0BKA - 2 Of 2)
    • Transmission Controls System (Service Information - 8-Speed - 0BK)
    • Transmission System (Gears & Hydraulic - Service Information - 8-Speed - 0BKA, 0BK)
    • Transmission System (Gears & Hydraulic Controls - Service Information - 8-Speed - 0BKA)
    • Transmission System (General Information - 8-Speed - 0BKA)
    • Transmission System (Torque Converter - Service Information - 8-Speed - 0BKA)
    • Transmission System & AWD System (General Information - 0BKA, 0BK)
  • Transmission Control Systems
    • Differential System (General & Service Information - 8-Speed - 0BK)
    • Final Drive System & Transmission System (General Information - 0B5A, 0BKA - 1 Of 2)
    • Final Drive System & Transmission System (General Information - 0B5A, 0BKA - 2 Of 2)
    • Transmission Controls System (Service Information - 8-Speed - 0BK)
    • Transmission System (Gears & Hydraulic Controls - Service Information - 8-Speed - 0BKA)
    • Transmission System & AWD System (General Information - 0BKA, 0BK)
• External Pages