Repair and Diagnosis

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• Quick Lookups
  • Common Specs & Procedures (Coupe)
  • DTC Index [DAZA] [Coupe]
  • Electrical Component Locations
    • TT QUATTRO - Component Locations
  • Fluids
  • Technical Bulletins
    • Technical Service Bulletins
  • Tire Fitment
  • Wiring Diagrams
    • OEM Wiring Diagrams
    • System Wiring Diagrams
    • Using lemon2025'S System Wiring Diagrams
• Accessories & Equipment
  • Anti-Theft Systems
    • Front Doors, Central Locking System [Coupe]
    • Interior Lights, Lamps And Switches [Coupe]
    • Interior Lights, Switches [Coupe]
  • Collision/Avoidance
    • Wheels, Tires, Wheel Alignment (Suspension, Wheels, Steering) [Coupe]
  • Communication Devices
    • General, Technical Data (Communication) [Coupe]
  • Cruise Control Systems
    • Charging System (Battery, Starter, Generator) & Cruise Control (1 Of 2) [Coupe]
    • Charging System (Battery, Starter, Generator) & Cruise Control (2 Of 2) [Coupe]
  • Drivers Assistance Systems - ADAS
    • Wheels, Tires, Wheel Alignment (Suspension, Wheels, Steering) [Coupe]
  • Entertainment Systems
    • Communication (1 Of 2) [Coupe]
  • Exterior Lights
    • Exterior Lights, Lamps And Switches [Coupe]
    • Exterior Lights, Switches [Coupe]
  • Gauges & Instrument Panels
    • Instruments [Coupe]
  • Headlights
    • Exterior Lights, Lamps And Switches [Coupe]
    • Exterior Lights, Switches [Coupe]
  • Infotainment
    • Communication (1 Of 2) [Coupe]
    • Communication (2 Of 2) [Coupe]
  • Interior/Exterior Trim
    • Exterior Equipment [Coupe]
    • General, Technical Data (Body Exterior) [Coupe]
    • Interior Equipment [Coupe]
    • Interior Trim [Coupe]
  • Interior/Illumination Lights
    • Interior Lights, Lamps And Switches [Coupe]
    • Interior Lights, Switches [Coupe]
  • Mirrors
    • Exterior Equipment [Coupe]
  • Seats
    • Interior Equipment [Coupe]
    • Seat Frames [Coupe]
    • Seat Upholstery, Covers [Coupe]
  • Warning Systems
    • Communication (1 Of 2) [Coupe]
  • Window Motors & Regulators
    • Exterior Equipment [Coupe]
    • Front Doors, Central Locking System [Coupe]
    • Glass, Window Regulators [Coupe]
  • Wiper/Washer Systems
    • Windshield Washer System [Coupe]
    • Wiper/Washer Systems [Coupe]
  • Wiring System (Data Link Connectors, Pwr Dist., Grnd Dist.)
    • Wires [Coupe]
    • Wiring [Coupe]
• Body & Frame
  • Door Locks
    • Front Doors, Central Locking System [Coupe]
    • Interior Lights, Lamps And Switches [Coupe]
    • Interior Lights, Switches [Coupe]
  • Exterior Body Panels
    • Body Front [Coupe]
    • Bumpers [Coupe]
    • Exterior Equipment [Coupe]
    • Front Doors, Central Locking System [Coupe]
    • General, Technical Data (Body Exterior) [Coupe]
    • Hood, Lids [Coupe]
  • Exterior/Interior Trim
    • Exterior Equipment [Coupe]
    • General, Technical Data (Body Exterior) [Coupe]
    • Interior Equipment [Coupe]
    • Interior Trim [Coupe]
  • Mirrors
    • Exterior Equipment [Coupe]
  • Seats
    • Interior Equipment [Coupe]
    • Seat Frames [Coupe]
    • Seat Upholstery, Covers [Coupe]
  • Windows
    • Exterior Equipment [Coupe]
    • Front Doors, Central Locking System [Coupe]
    • Glass, Window Regulators [Coupe]
• Brakes
  • Anti-Lock Brakes
    • Antilock Brake System [Coupe]
  • Mechanical - Hydraulic
    • General, Technical Data (Brake System) [Coupe]
    • Hydraulic Components (Brake System) [Coupe]
    • Mechanical Components (Brake System) [Coupe]
  • Parking Brake System
    • General, Technical Data (Brake System) [Coupe]
    • Mechanical Components (Brake System) [Coupe]
  • Traction Control
    • Antilock Brake System [Coupe]
• Drivelines & Axles
  • Axle Shafts
    • Front Suspension [Coupe]
    • Rear Suspension [Coupe]
• Electrical
  • Body Electrical
    • General, Technical Data (Electrical Equipment) [Coupe]
    • Wires [Coupe]
    • Wiring [Coupe]
  • Charging Systems
    • Charging System (Battery, Starter, Generator) & Cruise Control (1 Of 2) [Coupe]
    • Charging System (Battery, Starter, Generator) & Cruise Control (2 Of 2) [Coupe]
    • General, Technical Data (Electrical Equipment) [Coupe]
  • TT QUATTRO - Component Locations
  • Fuses & Circuit Breakers
    • Wires [Coupe]
    • Wiring [Coupe]
  • Gauges
    • Instruments [Coupe]
  • Motors, Switches, Relays
    • General, Technical Data (Electrical Equipment) [Coupe]
    • Wires [Coupe]
    • Wiring [Coupe]
  • Starter
    • Charging System (Battery, Starter, Generator) & Cruise Control (1 Of 2) [Coupe]
    • Charging System (Battery, Starter, Generator) & Cruise Control (2 Of 2) [Coupe]
  • Wiring Diagrams
    • OEM Wiring Diagrams
    • System Wiring Diagrams
    • Using lemon2025'S System Wiring Diagrams
• Engine Mechanical
  • Blowers, Superchargers & Turbochargers
    • Turbocharger, Supercharger (5-Cylinder Direct Injection 2.5L 4V TFSI Engine (Ea 855 EVO)) [Coupe]
    • Turbocharger, Supercharger (Servicing - 5-Cylinder 2.5L TFSI Engine (Ea 855 EVO)) [Coupe]
  • Cooling Fan
    • Cooling System (5-Cylinder Direct Injection 2.5L 4V TFSI Engine (Ea 855 EVO)) [Coupe]
    • Cooling System (Servicing - 5-Cylinder 2.5L TFSI Engine (Ea 855 EVO)) [Coupe]
  • Cooling System (Mechanical)
    • Cooling System (5-Cylinder Direct Injection 2.5L 4V TFSI Engine (Ea 855 EVO)) [Coupe]
    • Cooling System (Servicing - 5-Cylinder 2.5L TFSI Engine (Ea 855 EVO)) [Coupe]
    • General, Technical Data (5-Cylinder Direct Injection 2.5L 4V TFSI Engine (Ea 855 EVO)) [Coupe]
    • General, Technical Data (Servicing - 5-Cylinder 2.5L TFSI Engine (Ea 855 EVO)) [Coupe]
  • Exhaust
    • Exhaust System, Emission Controls (5-Cylinder Direct Injection 2.5L 4V TFSI Engine (Ea 855 EVO)) [Coupe]
    • Exhaust System, Emission Controls (Servicing - 5-Cylinder 2.5L TFSI Engine (Ea 855 EVO)) [Coupe]
    • General, Technical Data (5-Cylinder Direct Injection 2.5L 4V TFSI Engine (Ea 855 EVO)) [Coupe]
    • General, Technical Data (Servicing - 5-Cylinder 2.5L TFSI Engine (Ea 855 EVO)) [Coupe]
    • Wiring Diagram [DAZA] [Coupe]
  • Fuel System
    • Fuel Supply (Fuel System EVAP Leak Test) [Coupe]
    • Fuel Supply [Coupe]
    • General, Technical Data (5-Cylinder Direct Injection 2.5L 4V TFSI Engine (Ea 855 EVO)) [Coupe]
    • General, Technical Data (Fuel Supply - Gasoline Engines) [Coupe]
    • General, Technical Data (Servicing - 5-Cylinder 2.5L TFSI Engine (Ea 855 EVO)) [Coupe]
    • MULTIPORT Fuel Injection (5-Cylinder Direct Injection 2.5L 4V TFSI Engine (Ea 855 EVO)) [Coupe]
    • MULTIPORT Fuel Injection (Servicing - 5-Cylinder 2.5L TFSI Engine (Ea 855 EVO)) [Coupe]
    • Wiring Diagram [DAZA] [Coupe]
  • Lubrication System
    • General, Technical Data (5-Cylinder Direct Injection 2.5L 4V TFSI Engine (Ea 855 EVO)) [Coupe]
    • General, Technical Data (Servicing - 5-Cylinder 2.5L TFSI Engine (Ea 855 EVO)) [Coupe]
    • Lubrication (5-Cylinder Direct Injection 2.5L 4V TFSI Engine (Ea 855 EVO)) [Coupe]
    • Lubrication (Servicing - 5-Cylinder 2.5L TFSI Engine (Ea 855 EVO)) [Coupe]
    • Wiring Diagram [DAZA] [Coupe]
  • Mechanical
    • Crankshaft, Cylinder Block (5-Cylinder Direct Injection 2.5L 4V TFSI Engine (Ea 855 EVO)) [Coupe]
    • Crankshaft, Cylinder Block (Servicing - 5-Cylinder 2.5L TFSI Engine (Ea 855 EVO)) [Coupe]
    • Cylinder Head, VALVETRAIN (5-Cylinder Direct Injection 2.5L 4V TFSI Engine (Ea 855 EVO)) [Coupe]
    • Cylinder Head, VALVETRAIN (Servicing - 5-Cylinder 2.5L TFSI Engine (Ea 855 EVO) [Coupe]
    • Engine Assembly (5-Cylinder Direct Injection 2.5L 4V TFSI Engine (Ea 855 EVO)) [Coupe]
    • Engine Assembly (Servicing - 5-Cylinder 2.5L TFSI Engine (Ea 855 EVO)) [Coupe]
    • General, Technical Data (5-Cylinder Direct Injection 2.5L 4V TFSI Engine (Ea 855 EVO)) [Coupe]
    • General, Technical Data (Servicing - 5-Cylinder 2.5L TFSI Engine (Ea 855 EVO)) [Coupe]
    • Wiring Diagram [DAZA] [Coupe]
  • Starter
    • Charging System (Battery, Starter, Generator) & Cruise Control (1 Of 2) [Coupe]
    • Charging System (Battery, Starter, Generator) & Cruise Control (2 Of 2) [Coupe]
• Engine Performance
  • Emissions
    • Emission Applications
    • Emission Control Abbreviations
    • State Emission Standards - Diesel
    • State Emission Standards - Gas
  • Engine Control Systems
    • Generic Scan Tool [DAZA] - Engine DTC Tables (P0010 - U0002) & Transmission DTC Tables [Coupe]
    • Generic Scan Tool [DAZA] - Engine DTC Tables (P0420 - P11DA) [Coupe]
    • Generic Scan Tool [DAZA] - Engine DTC Tables (P0420 - P2088) [Coupe]
    • Generic Scan Tool [DAZA] (Description & Operation) [Coupe]
    • Generic Scan Tool [DAZA] (Engine DTC Tables 2018-2021) [Coupe]
    • Generic Scan Tool [DAZA] (Engine DTC Tables 2019 - 2022) [Coupe]
    • GENERIC SCAN TOOL [DAZA] (Engine DTC Tables) [COUPE]
    • Generic Scan Tool [DAZA] (General Information) [Coupe]
    • GENERIC SCAN TOOL [DAZA] (Transmission DTC Tables & Diagnostic Procedures) [COUPE]
    • Generic Scan Tool [DHHA] (2020) [Diagnostic Procedures] (Roadster)
  • Fuel Delivery
    • Fuel Supply (Fuel System EVAP Leak Test) [Coupe]
    • Fuel Supply [Coupe]
    • General, Technical Data (5-Cylinder Direct Injection 2.5L 4V TFSI Engine (Ea 855 EVO)) [Coupe]
    • General, Technical Data (Fuel Supply - Gasoline Engines) [Coupe]
    • General, Technical Data (Servicing - 5-Cylinder 2.5L TFSI Engine (Ea 855 EVO)) [Coupe]
    • MULTIPORT Fuel Injection (5-Cylinder Direct Injection 2.5L 4V TFSI Engine (Ea 855 EVO)) [Coupe]
    • MULTIPORT Fuel Injection (Servicing - 5-Cylinder 2.5L TFSI Engine (Ea 855 EVO)) [Coupe]
    • Wiring Diagram [DAZA] [Coupe]
  • Ignition System
    • General, Technical Data (5-Cylinder Direct Injection 2.5L 4V TFSI Engine (Ea 855 EVO)) [Coupe]
    • General, Technical Data (Servicing - 5-Cylinder 2.5L TFSI Engine (Ea 855 EVO)) [Coupe]
    • Ignition/Glow Plug System (5-Cylinder Direct Injection 2.5L 4V TFSI Engine (Ea 855 EVO)) [Coupe]
    • Wiring Diagram [DAZA] [Coupe]
  • Remove, Overhaul & Install
    • Wiring Diagram [DAZA] [Coupe]
  • Specifications
    • Firing Order & Cylinder Identification
  • System
    • Generic Scan Tool [DAZA] - Engine DTC Tables (P0010 - U0002) & Transmission DTC Tables [Coupe]
    • Generic Scan Tool [DAZA] - Engine DTC Tables (P0420 - P11DA) [Coupe]
    • Generic Scan Tool [DAZA] - Engine DTC Tables (P0420 - P2088) [Coupe]
    • Generic Scan Tool [DAZA] (Description & Operation) [Coupe]
    • Generic Scan Tool [DAZA] (Engine DTC Tables 2018-2021) [Coupe]
    • Generic Scan Tool [DAZA] (Engine DTC Tables 2019 - 2022) [Coupe]
    • GENERIC SCAN TOOL [DAZA] (Engine DTC Tables) [COUPE]
    • Generic Scan Tool [DAZA] (General Information) [Coupe]
    • GENERIC SCAN TOOL [DAZA] (Transmission DTC Tables & Diagnostic Procedures) [COUPE]
    • Generic Scan Tool [DHHA] (2020) [Diagnostic Procedures] (Roadster)
  • Testing & Diagnosis
    • Generic Scan Tool [DAZA] - Engine DTC Tables (P0010 - U0002) & Transmission DTC Tables [Coupe]
    • Generic Scan Tool [DAZA] - Engine DTC Tables (P0420 - P11DA) [Coupe]
    • Generic Scan Tool [DAZA] - Engine DTC Tables (P0420 - P2088) [Coupe]
    • Generic Scan Tool [DAZA] (Description & Operation) [Coupe]
    • Generic Scan Tool [DAZA] (Engine DTC Tables 2018-2021) [Coupe]
    • Generic Scan Tool [DAZA] (Engine DTC Tables 2019 - 2022) [Coupe]
    • GENERIC SCAN TOOL [DAZA] (Engine DTC Tables) [COUPE]
    • Generic Scan Tool [DAZA] (General Information) [Coupe]
    • GENERIC SCAN TOOL [DAZA] (Transmission DTC Tables & Diagnostic Procedures) [COUPE]
    • Generic Scan Tool [DHHA] (2020) [Diagnostic Procedures] (Roadster)
  • Tune-Up
    • General, Technical Data (5-Cylinder Direct Injection 2.5L 4V TFSI Engine (Ea 855 EVO)) [Coupe]
    • General, Technical Data (Servicing - 5-Cylinder 2.5L TFSI Engine (Ea 855 EVO)) [Coupe]
    • Ignition/Glow Plug System (5-Cylinder Direct Injection 2.5L 4V TFSI Engine (Ea 855 EVO)) [Coupe]
    • Wiring Diagram [DAZA] [Coupe]
• 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 [DAZA] [Coupe]
  • Electrical
    • Map - Electrical Systems
    • Using lemon2025'S System Wiring Diagrams
  • Engine
    • Engine Overhaul Procedures - General Information
    • General Cooling System Service - General Information
    • Technical Data (Oil Gauge Tester T40178 Service Values) [Coupe]
  • 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
    • Technical Data (Oil Gauge Tester T40178 Service Values) [Coupe]
    • Waveforms - Injector Pattern Tutorial - General Information
  • Map - Exhaust Systems
  • Heating, Ventilation & A/C (HVAC)
    • Map - Heating, Ventilation, & Air Conditioning
  • Hoist/Jack
    • General Information [Coupe]
  • Identification
    • CANADIAN Model Cross-Reference
    • General Information [Coupe]
    • General, Technical Data (5-Cylinder Direct Injection 2.5L 4V TFSI Engine (Ea 855 EVO)) [Coupe]
    • General, Technical Data (Servicing - 5-Cylinder 2.5L TFSI Engine (Ea 855 EVO)) [Coupe]
  • Metric Conversions
    • Engine Displacement Conversion Table - ECAT
    • Metric Conversions
  • OEM General Information
    • General Information [Coupe]
    • Technical Data (Oil Gauge Tester T40178 Service Values) [Coupe]
  • Reset Procedures
    • General Information [Coupe]
    • Maintenance Reminder Light (Reset Procedures)
  • Specifications Index
    • Common Specs & Procedures (Coupe)
  • Steering
    • Map - Steering, Suspension, Wheel Alignment, Wheels & Tires
    • Wheel Alignment Theory & Operation - General Information
  • Towing
    • General Information [Coupe]
  • Traction Control Disable Procedures
  • Trouble Shooting - Manual Transmission - General Information
• Heating, Ventilation & A/C (HVAC)
  • General Servicing
    • General, Technical Data (HVAC) [Coupe]
    • General, Technical Data (Refrigerant R1234YF Servicing) [Coupe]
  • HVAC Control Systems
    • Air Conditioning (1 Of 2) [Coupe]
    • Air Conditioning (2 Of 2) [Coupe]
    • Air Conditioning (Refrigerant R1234YF Servicing) (1 Of 2) [Coupe]
    • Air Conditioning (Refrigerant R1234YF Servicing) (2 Of 2) [Coupe]
    • Air Conditioning (Refrigerant R134A Servicing) (1 Of 2) [Coupe]
    • Air Conditioning (Refrigerant R134A Servicing) (2 Of 2) [Coupe]
    • General, Technical Data (HVAC) [Coupe]
    • General, Technical Data (Refrigerant R1234YF Servicing) [Coupe]
    • Heating, Ventilation [Coupe]
• Maintenance
  • Procedures
    • General Information [Coupe]
    • Maintenance Reminder Light (Reset Procedures)
    • Maintenance, Diagnosis (2021 AUDI Service) (1 Of 2) [Coupe]
    • Maintenance, Diagnosis (2021 AUDI Service) (2 Of 2) [Coupe]
    • Maintenance, Diagnosis (2021 Engine Oil Types) [Coupe]
    • Maintenance, Diagnosis (Specialty Engine Oils) [Coupe]
• Restraints
  • Air Bag, SRS
    • General, Technical Data (Body Interior) [Coupe]
    • Passenger Protection, Airbags, Seat Belts [Coupe]
  • Passive Restraints
    • General, Technical Data (Body Interior) [Coupe]
    • Interior Equipment [Coupe]
    • Passenger Protection, Airbags, Seat Belts [Coupe]
• Steering
  • Manual Steering
    • Steering [Coupe]
  • Power Steering
    • Steering [Coupe]
  • Steering Column
    • Steering [Coupe]
  • Steering Gear
    • General, Technical Data (Suspension, Wheels, Steering) [Coupe]
    • Steering [Coupe]
  • Steering Linkage
    • Steering [Coupe]
• Suspension
  • Electronic Suspension
    • Self-Leveling Suspension [Coupe]
  • Front Suspension
    • Front Suspension [Coupe]
    • General, Technical Data (Suspension, Wheels, Steering) [Coupe]
  • Rear Suspension
    • General, Technical Data (Suspension, Wheels, Steering) [Coupe]
    • Rear Suspension [Coupe]
  • Wheel Alignment
    • AUDI Wheel Alignment Specifications - TT
    • General, Technical Data (Suspension, Wheels, Steering) [Coupe]
    • Wheels, Tires, Wheel Alignment (Suspension, Wheels, Steering) [Coupe]
  • Wheels & Tire System
    • General, Technical Data (Suspension, Wheels, Steering) [Coupe]
    • Wheels, Tires And Wheel Alignment (Wheel And Tire Guide General Information) [Coupe]
    • Wheels, Tires And Wheel Alignment (Wheel And Tire Guide) [Coupe]
    • Wheels, Tires, Wheel Alignment (Suspension, Wheels, Steering) [Coupe]
• Transmission
  • Transmission Control Systems
    • Generic Scan Tool [DAZA] - Engine DTC Tables (P0010 - U0002) & Transmission DTC Tables [Coupe]
    • Generic Scan Tool [DAZA] - Engine DTC Tables (P0420 - P11DA) [Coupe]
    • Generic Scan Tool [DAZA] - Engine DTC Tables (P0420 - P2088) [Coupe]
    • Generic Scan Tool [DAZA] (Description & Operation) [Coupe]
    • Generic Scan Tool [DAZA] (Engine DTC Tables 2018-2021) [Coupe]
    • Generic Scan Tool [DAZA] (Engine DTC Tables 2019 - 2022) [Coupe]
    • Generic Scan Tool [DAZA] (General Information) [Coupe]
    • GENERIC SCAN TOOL [DAZA] (Transmission DTC Tables & Diagnostic Procedures) [COUPE]
    • Generic Scan Tool [DHHA] (2020) [Diagnostic Procedures] (Roadster)
• External Pages