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Originally Posted by Henrym3
So got the module and pump back, module looks brand new, that’s just an opinion as I’m only seeing the black plastic outer. All fitted and coded BUT I now have a brake pressure sensor fault which is keeping the lights on although they have turned from red to amber. The Foxwell shows the pressure sensor is permanently reading 292 bar of pressure. The vehicle drives fine so that pressure is not being applied while driving. The pedal is a little soft but I’m confident I can sort that. The sensor is fitted to a lot of BMW’s and other manufacturers ie Merc Fiat VW SAAB, so will probably get one from a breaker to absolutely confirm. Can anyone confirm if when sensor removed from pump does fluid come out. Don’t want to wast time on soft pedal fix if I’m going to have to repeat after sensor fix. Pissed though that this is the second time this has come back from ECUTESTING and shown a different fault.
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If you opened up the hydraulic lines anywhere, there is a potential the air bubbles got trapped in the ABS module. Usually to fix this, you'd have to cycle the ABS module in order to bleed the module. There is a service routine to fix this via INPA.
If all you got back is the pressure sensor issue, it could be something easy to check. Now I cannot find what model year and powertrain platform you have for your E53. This is important because there is a 38 pin connector style and a 42 pin connector style. At any rate, I'll go off of mine--which is 42 pin.
B76 is your pressure sensor. It lives on the back of the module with three wires from it to the DSC. To answer your question, it will need to sense line pressure--meaning it will have direct access to the fluid.
Located here:
