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ABS and SERV light on Scenic I
As discussed in many previous threads, probably sensor or wiring.
I used multi meter to check all the sensors,
The sensor hovers over a toothed ring and senses the passing of the tooth. Follow the wire form the sensor and a simple 2 pin round plug fitted close to where the wire enters the car body. The ohm reading fluctuated between .8k and 1.2k for those that were OK. On the last wheel I got to, there was a frayed wire, it had rubbed against the wheel, tip check the front ones fist.
Once you have made the adjustment/repair and reconnected the wire the light stays on, take the car for quick drive and the ABS