E53 51 pressure sensor line.
 

Cars been off the road for about 4 months we thought abs module needs repairing as got a error trying to connect and speedo was down still after replacing speed sensor its been repaired and tested by bba and ecutesting but we keep getting 051 pressure sensor/line but are lost had new master aswel and new brake pressure sensor from bba when they repaired module me and my mechanic are lost any help would be awesome i love the car just driving me insane its 02 3.0i e53

Il pass this on to my mechanic see if it helps thank you

From what I've heard many of these refurbishing companies don't have proper test procedure or means to repair pressure sensor or pre-charge pump related problems. So even if BBA-reman or ECU testing is saying the module is OK it usually just means the wheel speed sensor circuits are OK. If you are stumped and don't have another module to test with I would probably ask ACtronics opinion about the module.

https://www.actronics.co.uk/

I sent the hole thing off tho not just the module