Repair and Diagnosis

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• Quick Lookups
  • Common Specs & Procedures (A4 Platform)
  • DTC Index - 1.9L (ALH Engine), My 1999-2001
  • Electrical Component Locations
    • Diagnostic Connector (DLC) Locations
  • Fluids
  • Technical Bulletins
    • Campaigns
    • Safety Recalls
    • Tech Tips
    • Technical Service Bulletins
  • Tire Fitment
  • Wiring Diagrams
    • System Wiring Diagrams
    • Using lemon2025'S System Wiring Diagrams
• Accessories & Equipment
  • Anti-Theft Systems
    • * Platform Identification *
    • Body Exterior (A4 Platform)
    • Body On Board Diagnostic (OBD) (A4 Platform) [Convenience System (Vehicles With Power Windows), On Board Diagnostic (OBD)]
    • Body On Board Diagnostic (OBD) (A4 Platform) [On Board Diagnostic (OBD) - Driver's Side Seat Adjustment, On Board Diagnostic (OBD)]
    • Electrical Equipment (A4 Platform)
    • Electrical Equipment On Board Diagnostic (OBD) (A4 Platform)
  • Cruise Control Systems
    • * Platform Identification *
    • Electrical Equipment (A4 Platform)
  • Entertainment Systems
    • * Platform Identification *
    • Body On Board Diagnostic (OBD) (A4 Platform) [Convenience System (Vehicles With Power Windows), On Board Diagnostic (OBD)]
    • Body On Board Diagnostic (OBD) (A4 Platform) [On Board Diagnostic (OBD) - Driver's Side Seat Adjustment, On Board Diagnostic (OBD)]
    • Radio, Telephone, Navigation (A4 Platform)
  • Exterior Lights
    • * Platform Identification *
    • Electrical Equipment (A4 Platform)
    • Lights, Switches - Exterior (From Late Production 1999) (A4 Platform)
  • Gauges & Instrument Panels
    • * Platform Identification *
    • Body Interior (A4 Platform)
    • Electrical Equipment - General Information (A4 Platform)
    • Electrical Equipment (A4 Platform)
    • Electrical Equipment On Board Diagnostic (OBD) (A4 Platform)
  • Headlights
    • * Platform Identification *
    • Electrical Equipment - General Information (A4 Platform)
    • Electrical Equipment (A4 Platform)
    • Lights, Switches - Exterior (From Late Production 1999) (A4 Platform)
  • Horns
    • * Platform Identification *
    • Electrical Equipment (A4 Platform)
  • Infotainment
    • * Platform Identification *
    • Body On Board Diagnostic (OBD) (A4 Platform) [Convenience System (Vehicles With Power Windows), On Board Diagnostic (OBD)]
    • Body On Board Diagnostic (OBD) (A4 Platform) [On Board Diagnostic (OBD) - Driver's Side Seat Adjustment, On Board Diagnostic (OBD)]
    • Radio, Telephone, Navigation (A4 Platform)
  • Interior/Exterior Trim
    • * Platform Identification *
    • Body Exterior (A4 Platform)
    • Body Interior (A4 Platform)
  • Interior/Illumination Lights
    • * Platform Identification *
    • Electrical Equipment - General Information (A4 Platform)
    • Electrical Equipment (A4 Platform)
  • Mirrors
    • * Platform Identification *
    • Body Exterior (A4 Platform)
    • Body Interior (A4 Platform)
    • Body On Board Diagnostic (OBD) (A4 Platform) [Convenience System (Vehicles With Power Windows), On Board Diagnostic (OBD)]
    • Body On Board Diagnostic (OBD) (A4 Platform) [On Board Diagnostic (OBD) - Driver's Side Seat Adjustment, On Board Diagnostic (OBD)]
  • Seats
    • * Platform Identification *
    • Body Interior (A4 Platform)
    • Body On Board Diagnostic (OBD) (A4 Platform) [Convenience System (Vehicles With Power Windows), On Board Diagnostic (OBD)]
    • Body On Board Diagnostic (OBD) (A4 Platform) [On Board Diagnostic (OBD) - Driver's Side Seat Adjustment, On Board Diagnostic (OBD)]
  • Steering Column Switches
    • * Platform Identification *
    • Electrical Equipment (A4 Platform)
    • Lights, Switches - Exterior (From Late Production 1999) (A4 Platform)
  • Window Motors & Regulators
    • * Platform Identification *
    • Body Exterior (A4 Platform)
  • Wiper/Washer Systems
    • * Platform Identification *
    • Electrical Equipment - General Information (A4 Platform)
    • Electrical Equipment (A4 Platform)
• Body & Frame
  • Door Locks
    • * Platform Identification *
    • Body Exterior (A4 Platform)
    • Body On Board Diagnostic (OBD) (A4 Platform) [Convenience System (Vehicles With Power Windows), On Board Diagnostic (OBD)]
    • Body On Board Diagnostic (OBD) (A4 Platform) [On Board Diagnostic (OBD) - Driver's Side Seat Adjustment, On Board Diagnostic (OBD)]
    • Electrical Equipment (A4 Platform)
    • Electrical Equipment On Board Diagnostic (OBD) (A4 Platform)
  • Exterior Body Panels
    • * Platform Identification *
    • Body Collision Repair (A4 Platform)
    • Body Exterior (A4 Platform)
  • Exterior/Interior Trim
    • * Platform Identification *
    • Body Exterior (A4 Platform)
    • Body Interior (A4 Platform)
  • Frames, Subframes & Crossmembers
    • * Platform Identification *
    • Body Collision Repair (A4 Platform)
  • Mirrors
    • * Platform Identification *
    • Body Exterior (A4 Platform)
    • Body Interior (A4 Platform)
    • Body On Board Diagnostic (OBD) (A4 Platform) [Convenience System (Vehicles With Power Windows), On Board Diagnostic (OBD)]
    • Body On Board Diagnostic (OBD) (A4 Platform) [On Board Diagnostic (OBD) - Driver's Side Seat Adjustment, On Board Diagnostic (OBD)]
  • Seats
    • * Platform Identification *
    • Body Interior (A4 Platform)
    • Body On Board Diagnostic (OBD) (A4 Platform) [Convenience System (Vehicles With Power Windows), On Board Diagnostic (OBD)]
    • Body On Board Diagnostic (OBD) (A4 Platform) [On Board Diagnostic (OBD) - Driver's Side Seat Adjustment, On Board Diagnostic (OBD)]
  • Sun Roof/T-Top/Convertible Top
    • * Platform Identification *
    • Body Exterior (A4 Platform)
    • Electrical Equipment (A4 Platform)
  • Windows
    • * Platform Identification *
    • Body Exterior (A4 Platform)
• Brakes
  • Anti-Lock Brakes
    • * Platform Identification *
    • Brake System - OBD (A4 Platform)
  • Mechanical - Hydraulic
    • * Platform Identification *
  • Parking Brake System
    • * Platform Identification *
  • Traction Control
    • * Platform Identification *
    • Brake System - OBD (A4 Platform)
• Drivelines & Axles
  • Axle Shafts
    • * Platform Identification *
    • Suspension, Wheels, Steering (A4 Platform)
  • Differentials & Drive Axles
    • * Platform Identification *
    • 5 SPD. Manual Transmission 02J (A4 Platform)
    • Suspension, Wheels, Steering (A4 Platform)
• Electrical
  • Body Electrical
    • * Platform Identification *
    • Electrical Equipment (A4 Platform)
  • Charging Systems
    • * Platform Identification *
    • Electrical Equipment (A4 Platform)
  • Component Locations
    • Diagnostic Connector (DLC) Locations
  • Fuses & Circuit Breakers
    • * Platform Identification *
    • Electrical Equipment (A4 Platform)
    • Fuses & Circuit Breakers - From Late Production 1999
  • Gauges
    • * Platform Identification *
    • Body Interior (A4 Platform)
    • Electrical Equipment - General Information (A4 Platform)
    • Electrical Equipment (A4 Platform)
    • Electrical Equipment On Board Diagnostic (OBD) (A4 Platform)
  • Horns
    • * Platform Identification *
    • Electrical Equipment (A4 Platform)
  • Motors, Switches, Relays
    • * Platform Identification *
    • Electrical Equipment (A4 Platform)
  • Starter
    • * Platform Identification *
    • Electrical Equipment - General Information (A4 Platform)
    • Electrical Equipment (A4 Platform)
  • Wiring Diagrams
    • System Wiring Diagrams
    • Using lemon2025'S System Wiring Diagrams
• Engine Mechanical
  • Accessory Drive Belts
    • * Platform Identification *
    • 1.9L - TDI Engine Mechanical - ALH (A4 Platform)
    • Electrical Equipment (A4 Platform)
    • Specifications & Drive Belt Routing - 1.9L (ALH Engine)
  • Auxiliary Emission Control Systems
    • Emission Control System Visual Inspection Procedures - General Information
  • Blowers, Superchargers & Turbochargers
    • * Platform Identification *
    • 1.9L - Exhaust System, Emission Controls - ALH, BEW (Generic Scan Tool) (A4 Platform)
    • 1.9L - TDI Engine Mechanical - ALH (A4 Platform)
    • 1.9L - Turbocharger, G-Charger - ALH (A4 Platform)
    • 1.9L - Turbocharger, G-Charger - ALH, BEW (Generic Scan Tool) (A4 Platform)
  • Cooling Fan
    • * Platform Identification *
    • 1.9L - Cooling System - ALH (A4 Platform)
    • 1.9L - TDI Engine Mechanical - ALH (A4 Platform)
  • Cooling System (Mechanical)
    • * Platform Identification *
    • 1.9L - Cooling System - ALH (A4 Platform)
    • 1.9L - TDI Engine Mechanical - ALH (A4 Platform)
    • Specifications & Drive Belt Routing - 1.9L (ALH Engine)
  • Exhaust
    • * Platform Identification *
    • 1.9L - Exhaust System, Emission Controls - ALH (A4 Platform)
    • 1.9L - Exhaust System, Emission Controls - ALH, BEW (Generic Scan Tool) (A4 Platform)
    • 1.9L - TDI Engine Mechanical - ALH (A4 Platform)
    • 1.9L - Turbocharger, G-Charger - ALH (A4 Platform)
  • Fuel System
    • * Platform Identification *
    • 1.9L - Diesel Fuel Injection - ALH (A4 Platform)
    • 1.9L - Diesel Fuel Injection - TDI, ALH, BEW (Generic Scan Tool) (A4 Platform)
    • 1.9L - Fuel Supply - ALH, BEW (Generic Scan Tool) (A4 Platform)
    • 1.9L - TDI And TDI Pd Generic Scan Tool, Engine Code(S): ALH, BEW (A4 Platform)
    • 1.9L - TDI Engine Mechanical - ALH (A4 Platform)
  • Lubrication System
    • 1.9L - TDI Engine Mechanical - ALH (A4 Platform)
  • Mechanical
    • * Platform Identification *
    • 1.9L - Engine Mechanical - ALH (A4 Platform)
    • 1.9L - TDI Engine Mechanical - ALH (A4 Platform)
  • Starter
    • * Platform Identification *
    • Electrical Equipment - General Information (A4 Platform)
    • Electrical Equipment (A4 Platform)
  • Timing Belt
    • * Platform Identification *
    • 1.9L - TDI Engine Mechanical - ALH (A4 Platform)
    • Timing Belt Replacement - 1.9L - ALH
• Engine Performance
  • Application
    • Introduction
  • Emissions
    • EGR Function Testing - Diesel
    • Emission Applications
    • Emission Applications - Diesel
    • Emission Control Abbreviations
    • State Emission Standards - Diesel
    • State Emission Standards - Gas
  • Fuel Delivery
    • * Platform Identification *
    • 1.9L - Diesel Fuel Injection - ALH (A4 Platform)
    • 1.9L - Diesel Fuel Injection - TDI, ALH, BEW (Generic Scan Tool) (A4 Platform)
    • 1.9L - Fuel Supply - ALH, BEW (Generic Scan Tool) (A4 Platform)
    • 1.9L - TDI And TDI Pd Generic Scan Tool, Engine Code(S): ALH, BEW (A4 Platform)
    • 1.9L - TDI Engine Mechanical - ALH (A4 Platform)
  • Ignition System
    • * Platform Identification *
    • 1.9L - Fuel Injection Glow Plug, Engine Code: ALH (A4 Platform)
    • 1.9L - Ignition/Glow Plug System - ALH, 2V TDI (A4 Platform)
    • 1.9L - TDI And TDI Pd Generic Scan Tool, Engine Code(S): ALH, BEW (A4 Platform)
  • Mode 6
    • Mode 6 - 1996-02 Golf, GTI, JETTA, CABRIO
    • Mode 6 - 1999-06 Golf, GTI, JETTA, JETTA Wagon
  • Remove, Overhaul & Install
    • * Platform Identification *
    • 1.9L - Fuel Injection Glow Plug, Engine Code: ALH (A4 Platform)
    • 1.9L - Diesel Fuel Injection - ALH (A4 Platform)
    • 1.9L - Exhaust System, Emission Controls - ALH (A4 Platform)
    • 1.9L - TDI And TDI Pd Generic Scan Tool, Engine Code(S): ALH, BEW (A4 Platform)
    • 1.9L - Turbocharger, G-Charger - ALH (A4 Platform)
  • Specifications
    • Firing Order & Cylinder Identification
  • System
    • * Platform Identification *
    • 1.9L - Fuel Injection Glow Plug, Engine Code: ALH (A4 Platform)
    • 1.9L - Diesel Fuel Injection - ALH (A4 Platform)
    • 1.9L - Diesel Fuel Injection - TDI, ALH, BEW (Generic Scan Tool) (A4 Platform)
    • 1.9L - Exhaust System, Emission Controls - ALH (A4 Platform)
    • 1.9L - Exhaust System, Emission Controls - ALH, BEW (Generic Scan Tool) (A4 Platform)
    • 1.9L - Fuel Supply - ALH, BEW (Generic Scan Tool) (A4 Platform)
    • 1.9L - Ignition/Glow Plug System - ALH (A4 Platform)
    • 1.9L - Ignition/Glow Plug System - ALH, 2V TDI (A4 Platform)
    • 1.9L - Ignition/Glow Plug System - ALH, BEW (Generic Scan Tool) (A4 Platform)
    • 1.9L - TDI And TDI Pd Generic Scan Tool, Engine Code(S): ALH, BEW (A4 Platform)
    • 1.9L - TDI Engine Mechanical - ALH (A4 Platform)
    • 1.9L - Turbocharger, G-Charger - ALH (A4 Platform)
    • 1.9L - Turbocharger, G-Charger - ALH, BEW (Generic Scan Tool) (A4 Platform)
    • On Board Diagnostic (OBD) - 1.9L ALH, 2V TDI
    • On Board Diagnostic (OBD), Generic Scan Tool - 1.9L TDI, ALH, BEW (A4 Platform)
  • Testing & Diagnosis
    • * Platform Identification *
    • 1.9L - Fuel Injection Glow Plug, Engine Code: ALH (A4 Platform)
    • 1.9L - Diesel Fuel Injection - ALH (A4 Platform)
    • 1.9L - Diesel Fuel Injection - TDI, ALH, BEW (Generic Scan Tool) (A4 Platform)
    • 1.9L - Exhaust System, Emission Controls - ALH (A4 Platform)
    • 1.9L - Exhaust System, Emission Controls - ALH, BEW (Generic Scan Tool) (A4 Platform)
    • 1.9L - Fuel Supply - ALH, BEW (Generic Scan Tool) (A4 Platform)
    • 1.9L - Ignition/Glow Plug System - ALH (A4 Platform)
    • 1.9L - Ignition/Glow Plug System - ALH, 2V TDI (A4 Platform)
    • 1.9L - Ignition/Glow Plug System - ALH, BEW (Generic Scan Tool) (A4 Platform)
    • 1.9L - TDI And TDI Pd Generic Scan Tool, Engine Code(S): ALH, BEW (A4 Platform)
    • 1.9L - TDI Engine Mechanical - ALH (A4 Platform)
    • 1.9L - Turbocharger, G-Charger - ALH (A4 Platform)
    • 1.9L - Turbocharger, G-Charger - ALH, BEW (Generic Scan Tool) (A4 Platform)
    • On Board Diagnostic (OBD) - 1.9L ALH, 2V TDI
    • On Board Diagnostic (OBD), Generic Scan Tool - 1.9L TDI, ALH, BEW (A4 Platform)
  • Tune-Up
    • * Platform Identification *
    • 1.9L - Fuel Injection Glow Plug, Engine Code: ALH (A4 Platform)
    • 1.9L - Ignition/Glow Plug System - ALH, 2V TDI (A4 Platform)
    • 1.9L - TDI And TDI Pd Generic Scan Tool, Engine Code(S): ALH, BEW (A4 Platform)
  • Vacuum Diagrams
• 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
  • Computer Relearn Procedures
  • OBD-II Drive Cycles
  • 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 - 1.9L (ALH Engine), My 1999-2001
  • 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
    • Emission Control Visual Inspection Procedures - Diesel
    • 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
  • Identification
    • * Platform Identification *
    • CANADIAN Model Cross-Reference
  • Metric Conversions
    • Engine Displacement Conversion Table - ECAT
    • Metric Conversions
  • OEM General Information
    • * Platform Identification *
    • How To Use The Engine Performance Section
  • Maintenance Reminder Light (Reset Procedures)
  • Restraints
    • Air Bag Deactivation Procedures
    • Air Bag/SRS Component Inspection & Replacement Tables - EUROPEAN
  • Specifications Index
    • Common Specs & Procedures (A4 Platform)
  • Steering
    • Map - Steering, Suspension, Wheel Alignment, Wheels & Tires
    • Wheel Alignment Theory & Operation - General Information
  • Traction Control Disable Procedures
  • Trouble Shooting - Manual Transmission - General Information
• Heating, Ventilation & A/C (HVAC)
  • A/C Compressor
    • * Platform Identification *
    • Heating, Ventilation Air Conditioning (A4 Platform)
  • General Servicing
    • * Platform Identification *
    • Cabin Air Filter - A4 Platform
  • HVAC Control Systems
    • * Platform Identification *
    • A/C Heater Systems - Automatic (A3 Platform)
    • Air Conditioning (From Late Production 1999) (A4 Platform)
    • Heating, Ventilation Air Conditioning (A4 Platform)
    • On Board Diagnostic (OBD) (From Late Production 1999) (A4 Platform)
    • Refrigerant R134A - Servicing (A4 Platform)
• Maintenance
  • Procedures
    • * Platform Identification *
    • Maintenance (A4 Platform)
    • Maintenance (From Late Production 1999) (A4 Platform)
    • Maintenance Information
    • Maintenance Reminder Light (Reset Procedures)
• Restraints
  • Air Bag, SRS
    • * Platform Identification *
    • 1999 ACCESSORIES & EQUIPMENT-- Air Bag Restraint Systems
    • Air Bag Restraint System
    • Air Bag/SRS Component Inspection & Replacement Tables - EUROPEAN
    • Body Interior (A4 Platform)
    • Body On Board Diagnostic (OBD) (A4 Platform) [Convenience System (Vehicles With Power Windows), On Board Diagnostic (OBD)]
    • Body On Board Diagnostic (OBD) (A4 Platform) [On Board Diagnostic (OBD) - Driver's Side Seat Adjustment, On Board Diagnostic (OBD)]
  • Passive Restraints
    • * Platform Identification *
    • Body Interior (A4 Platform)
  • Restraints Control Systems
    • * Platform Identification *
    • Body Interior (A4 Platform)
    • Body On Board Diagnostic (OBD) (A4 Platform) [Convenience System (Vehicles With Power Windows), On Board Diagnostic (OBD)]
    • Body On Board Diagnostic (OBD) (A4 Platform) [On Board Diagnostic (OBD) - Driver's Side Seat Adjustment, On Board Diagnostic (OBD)]
  • Seat Belts
    • * Platform Identification *
    • Body Interior (A4 Platform)
    • Body On Board Diagnostic (OBD) (A4 Platform) [Convenience System (Vehicles With Power Windows), On Board Diagnostic (OBD)]
    • Body On Board Diagnostic (OBD) (A4 Platform) [On Board Diagnostic (OBD) - Driver's Side Seat Adjustment, On Board Diagnostic (OBD)]
• Steering
  • Manual Steering
    • * Platform Identification *
    • Power Steering Pump, Reservoir, Hydraulic Lines (A4 Platform)
    • Steering Column (From Late Production 1999) ( A4 Platform)
    • Suspension, Wheels, Steering (A4 Platform)
  • Power Steering
    • * Platform Identification *
    • Power Steering Pump, Reservoir, Hydraulic Lines (A4 Platform)
    • Steering Column (From Late Production 1999) ( A4 Platform)
    • Suspension, Wheels, Steering (A4 Platform)
  • Steering Column
    • * Platform Identification *
    • Steering Column (From Late Production 1999) ( A4 Platform)
    • Suspension, Wheels, Steering (A4 Platform)
  • Steering Gear
    • * Platform Identification *
    • Suspension, Wheels, Steering (A4 Platform)
• Suspension
  • Electronic Suspension
    • * Platform Identification *
    • Suspension, Wheels, Steering (A4 Platform)
  • Front Suspension
    • * Platform Identification *
    • Suspension, Wheels, Steering (A4 Platform)
  • Rear Suspension
    • * Platform Identification *
    • Suspension, Wheels, Steering (A4 Platform)
  • Wheel Alignment
    • * Platform Identification *
    • Suspension, Wheels, Steering (A4 Platform)
  • Wheels & Tire System
    • * Platform Identification *
    • Suspension, Wheels, Steering (A4 Platform)
    • Wheel And Tire Guide - Non Current Models (A4 Platform)
• Transmission
  • Automatic Trans
    • * Platform Identification *
  • Clutch
    • * Platform Identification *
    • 5 SPD. Manual Transmission 02J (A4 Platform)
    • CLUTCHES - 02J (A4 PlLATFORM)
  • Manual Trans
    • * Platform Identification *
    • 5 SPD. Manual Transmission 02J (A4 Platform)
• External Pages