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.
1999 Audi A8 BaseFACTORY OEM SERVICE PROCEDURE
Test requirements
- "Automatic Test Sequence" carried out to establish that any malfunctions stored in Transmission Control Module (TCM) and Engine Control Module (ECM) only affect ABS/ESP.
- Connect VAS5051 tester or VAG1551 scan tool and select the address word 00 (with ignition on). See VAG1551 SCAN TOOL (ST), CONNECTING AND ENTERING ADDRESS WORD .
- After completing electrical testing, check and erase DTC memories of Transmission Control Module (TCM) and Engine Control Module (ECM).
- Multi-pin harness connector for ABS Control Module (w/EDL) -J104- in proper condition, with no bent, broken or corroded terminals. Replace any damaged terminals using VAS1978 wiring repair kit.
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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