1999 Audi A8 BaseFACTORY OEM SERVICE PROCEDURE

On Board Diagnostic (OBD), specific functions: Notes

The OBD function of the ESP system can recognize malfunctions and store a total of 41 different Diagnostic Trouble Codes (DTCs).

NOTE: If a malfunction is recognized by OBD, the system concerned is switched off automatically for the duration of the current driving cycle. This is indicated by the relevant warning light in the instrument cluster. See INDICATOR LIGHT FUNCTIONS, OVERVIEWΒ  for more information.
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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