Having problems with your 2004 Volkswagen Jetta ?
The ABS dashboard light comes on when cold start. After the second time the car is started and driven off over 25 Km/h, the light goes out.
It is a probabilty that the ABS Brake Exciter Rings, or the Sensor Heads have been contaminated. It means removing each wheel in turn, disconnect each ABS wiring coupler and reconnecting it, and then loking at each ring and sensor in turn, and cleaning the rings witha Wire Brush, and the Sensor with solvent.
Repair Help & Product Troubleshooting for 2004 Volkswagen Jetta
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