OBD program application notes
Always confirm vehicle VIN and instrument cluster software version as per section title above. Confirm instrument cluster software version by initiating OBD program and reading information in display. Refer to Instrument cluster On Board Diagnostic (OBD), initiating .
In the event an instrument cluster was previously replaced in a vehicle with VIN up to 8N_Y040000, the new/replacement cluster may contain software version D26 which contains certain Diagnostic Trouble Code (DTC), Read Measuring Value Block and Adaptation information that is not specifically covered in this section.
Information on replacement instrument clusters with software version D26 are contained in section "Interment cluster On Board Diagnostic (OBD) from VIN 8N_Y040001 and/or software versions from D26 &D03". Refer to Application notes .
Message "dEF" on trip recorder display
If the control module in the instrument cluster detects a malfunction in its permanent memory, the letters "dEF" will appear on the trip recorder display.
- If "dEF" appears on the display, replace the instrument cluster. Refer to «Instrument cluster, removing and installing»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment) .
Scheme 94
- Pry lever 80-200
Scheme 95
- VAS 5051 Vehicle Diagnostic Testing and Information System
- Optional: VAS 5052 Vehicle Diagnostic and Service System
- Optional: VAG 1551/1552 Scan Tool (ST)