BMW E39 DSC pressure sensor and ABS unit bleeding
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E39 DSC unit pressure sensor fault codes 81 and 115 – what do they mean?
Code 81 means an open circuit in the pressure sensor and code 115 means a pressure sensor fault. Cleaning the sensor connector and the DSC unit main connector with contact cleaner helped only temporarily.
Why do the ABS and DSC lights come on because of the pressure sensor wire?
The wire from the pressure sensor can come loose from the circuit board, which turns on the ABS and traction control lights. Repairing the wire removes the fault, so check the wire before replacing the sensor.
Does the system need to be bled after replacing the pressure sensor?
Yes. Bleeding is done with a diagnostic tool that opens and cycles the valves while the system is bled. If air remains in the system, the sensor reads wrong and the yellow light can return. Keep the brake fluid level correct so that air does not get into the system.
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