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.
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HOMESERVICE MANUALSAUDI2004A4 BASE, 4D SEDAN, 3.0 TREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTHEATED GLASS/DEFOGGERSON BOARD DIAGNOSTIC (OBD)
2004 Audi A4 Base, 4D Sedan, 3.0 T
On Board Diagnostic (OBD)
2004 Audi A4 Base, 4D Sedan, 3.0 TSECTION On Board Diagnostic (OBD)
- Automatic Climate Control System, On Board Diagnostic (OBD)
- Notes
- On Board Diagnostic (OBD), technical data
- Function
- Safety precautions
- VAS 5051 Vehicle Diagnostic, Testing and Information System, connecting and selecting functions
- Diagnostic Trouble Code (DTC) Memory, checking (function 02)
- Diagnostic Trouble Code (DTC) table
- DTC table up to DTC "00975"
- DTC table from DTC "01044"
- Output Diagnostic Test Mode (DTM) (function 03)
- Basic Setting (function 04)
- Diagnostic Trouble Code (DTC) Memory, erasing (function 05)
- End Output (function 06)
- A/C control head -E87-, coding (function 07)
- Read Measuring Value Block (function 08)
- Overview of selectable display group numbers
- Measuring value blocks 001 to 010
- Measuring value blocks from display group 011 through 019
- Measuring value blocks from display group 020
- Display groups currently not to be used by dealerships
- A/C Control Head -E87-, Adaptation (function 10)
- Adaptation (function 10) in channel 03, performing
- Adaptation of fresh air blower RPM decrease, performing (adaptation channel 08)
- Adaptation of Vehicle Identification Number (VIN), performing (adaptation channel 81)
- CAN-bus comfort system, checking
- Automatic Climate Control System, electrical testing
- Wiring and component testing using VAG 1598 A test box
- Test step 1 to 4
- Test steps 5 to 9
- Components activated by A/C control head -E87-, electrical testing
- Windshield defroster
- Sensor for air quality -G238-
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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.