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 MANUALSAUDI1998A4 AVANT QUATTRO, AUTOMATICREPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSSHIFT INTERLOCK SYSTEMSDESCRIPTION & OPERATION
1998 Audi A4 Avant Quattro, Automatic
Description & Operation
1998 Audi A4 Avant Quattro, AutomaticSECTION Description & Operation
- A mechanical control cable prevents ignition key from being removed unless gear selector is in Park. With ignition key removed, gear selector locks in Park. See Fig 1 .
- All models are equipped with an electronic shift lock system. Transmission Control Module (TCM) controls shift lock system. See Fig 2 . This system locks gear selector in Park or Neutral position unless brake pedal is pushed down. TCM uses shift lock control relay to release a solenoid mounted on gear selector assembly.
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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.