If the light stays on before moving the car, the ABS module is seeing a fault in the system during its initial checks. Could be a faulty sensor or a fault within the module itself. A dirty or blocked sensor/reluctor ring would only tend to throw a code after the vehicle moves. A split in the wiring of a sensor could have let water in causing the issue. Definitely get the codes read to help narrow it down.
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1996 850 T5 - Sold
2003 S40 1.9d - Sold
2004 S60 D5
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