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)AUTOMATIC CLIMATE CONTROL SYSTEM, ON BOARD DIAGNOSTIC (OBD)DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING (FUNCTION 02)
2004 Audi A4 Base, 4D Sedan, 3.0 T
Diagnostic Trouble Code (DTC) Memory, checking (function 02)
2004 Audi A4 Base, 4D Sedan, 3.0 TSECTION Diagnostic Trouble Code (DTC) Memory, checking (function 02)
NOTE:
- The A/C Control Head -E87- switches automatically to "Econ" operating mode, if the basic setting has not been carried out after replacing E87, or the measured pressure of High Pressure Sensor -G65- is too low or too high (compressor should not be switched on), see READ MEASURING VALUE BLOCK (FUNCTION 08) . This condition is stored as a malfunction in the DTC memory.
- If the A/C control module -E87- automatically changes into operating mode "Off" after the ignition was switched on and with the ignition switched on, only the operating mode "Def" can be selected (other selections are not possible). In this case, (for example) the ignition has been switched on with a key, that is not enabled for this vehicle or the control module in the instrument cluster does not send the key number via the CAN-bus comfort system.
- With ignition switched off connect VAS 5051 Vehicle Diagnostic, Testing and Information System with the VAS 5051/1 diagnostic cable to the 16-pin diagnostic connector on the vehicle and select address word "08 - A/C heater/electronics". See VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS .
Indicated on display of VAS 5051:
- Select "02 - Check DTC memory" function.
Indicated on display of VAS 5051:
- Display field -1- indicates the number of stored malfunctions.
- Display field -2- indicates the DTC, the malfunction location and malfunction type of the saved malfunction.
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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.