Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Repair and Diagnosis
1999 Audi A6 QuattroSECTION Repair and Diagnosis
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Quick Lookups- Accessories & Equipment
- Anti-Theft Systems
- Communication Devices
- Cruise Control Systems
- Entertainment Systems
- Exterior Lights
- Gauges & Instrument Panels
- Headlights
- Heated Glass/Defoggers
- Horns
- Infotainment
- Interior/Exterior Trim
- Interior/Illumination Lights
- Memory Modules
- Mirrors
- Seats
- Steering Column Switches
- Warning Systems
- Window Motors & Regulators
- Wiper/Washer Systems
- Body & Frame
- Brakes
- Drivelines & Axles
- Electrical
- Engine Mechanical
- Engine Performance
- Application
- Emissions
- Fuel Delivery
- Ignition System
- Mode 6 - 1998-05 A6, A6 AVANT, ALLROAD QUATTRO, RS6, S6 AVANT
- Specifications
- System
- Exhaust System, Emission Control, Generic Scan Tool - 2.8L V6 Aha, ATQ
- Exhaust System, Emission Controls - 2.8L V6 Aha, ATQ
- Fuel Supply System - All Engines
- Fuel Supply, Generic Scan Tool - 2.8L V6 Aha, ATQ
- Ignition System - 2.8L V6 Aha
- Ignition System - 2.8L V6 ATQ
- Ignition/Glow Plug System, Generic Scan Tool - 2.8L V6 Aha, ATQ
- MULTIPORT Fuel Injection (MFI) - 2.8L V6 ATQ
- MULTIPORT Fuel Injection (MFI), Generic Scan Tool - 2.8L V6 Aha, ATQ
- On Board Diagnostic (OBD) - 2.8L V6 Aha
- On Board Diagnostic (OBD), Generic Scan Tool - 2.8L V6 Aha, ATQ
- Testing & Diagnosis
- Exhaust System, Emission Control, Generic Scan Tool - 2.8L V6 Aha, ATQ
- Exhaust System, Emission Controls - 2.8L V6 Aha, ATQ
- Fuel Supply System - All Engines
- Fuel Supply, Generic Scan Tool - 2.8L V6 Aha, ATQ
- Ignition System - 2.8L V6 Aha
- Ignition System - 2.8L V6 ATQ
- Ignition/Glow Plug System, Generic Scan Tool - 2.8L V6 Aha, ATQ
- MULTIPORT Fuel Injection (MFI) - 2.8L V6 ATQ
- MULTIPORT Fuel Injection (MFI), Generic Scan Tool - 2.8L V6 Aha, ATQ
- On Board Diagnostic (OBD) - 2.8L V6 Aha
- On Board Diagnostic (OBD), Generic Scan Tool - 2.8L V6 Aha, ATQ
- Tune-Up
- Vacuum Diagrams
- General Information
- Abbreviations
- Basic Trouble Shooting
- Brakes
- Check Lists
- Computer Relearn Procedures
- OBD-II Drive Cycles
- Driveline/Axles
- DTC Index - 2.8L (Aha & ATQ Engines)
- Electrical
- Engine
- 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)
- Identification
- Metric Conversions
- OEM General Information
- Maintenance Reminder Light (Reset Procedures)
- Restraints
- Specifications Index
- Steering
- Traction Control Disable Procedures
- Trouble Shooting - Manual Transmission - General Information
- Heating, Ventilation & A/C (HVAC)
- Maintenance
- Restraints
- Steering
- Suspension
- Transmission
- External Pages
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.