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 MANUALSAUDI1996A4 BASE, STANDARDREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEMDIAGNOSIS & TESTINGTEST NO. 6VEHICLE SPEED SENSOR (VSS)
1996 Audi A4 Base, Standard
Vehicle Speed Sensor (VSS)
1996 Audi A4 Base, StandardSECTION Vehicle Speed Sensor (VSS)
- Place ABS tester program switch in position "6". See Figure . Place transmission in Neutral with hand brake released. Rotate wheel selection knob to wheel being tested. Turn wheel being tested by hand until LED for wheel selected illuminates without flickering (about one revolution/second). VSS signal must read greater than 0.8 on ABS tester analog gauge. Test each VSS separately.
- If VSS speed sensor signal is not greater than minimum value, check for excessive air gap between VSS and speed sensor rotor, loose sensor rotor, or excessive wheel bearing play.
- If no response comes from selected VSS, disconnect connector plug of defective VSS. Front VSS connector plug is located near front shock tower. Rear VSS connector plug is located under rear seat cushion. Disconnect sensor connector plug of VSS being tested. Using an ohmmeter, check resistance of VSS. If resistance is not 800-1800 ohms, replace VSS.
- If VSS is okay, check continuity between VSS and ABS control unit connector. Bridge male terminals of VSS connector plug. Remove ABS control unit connector. Check for continuity between VSS previously bridged and corresponding terminals of ABS control unit connector. If continuity does not exist, repair wiring. See wiring diagram under WIRING DIAGRAMS .
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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.