these are the Error codes for the ABS control unit Bosch "ABS 5.3" and "ABS 2E":

12-diagnosis - Start / End (Starts / Ends with the diagnosis)
16-valve defect magnetic front LH /
17-valve defect magnetic front RH /
18-magnetic valve defect behind
19-defective safety valve relay
25-False Ubetragungstaktung-gear wheel defektr
26-magnetic valve defect behind LH
27-magnetic valve defect behind RH
28-defect discharge valve Magne front RH
29-defect discharge valve Magne front LH
31-defect discharge valve Magne rear LH
32-defect discharge valve Magne rear RH
35-pump defects Ruckforderpumpe Relaikreis
37-Broken Bremslichtschalter
39-Broken Vordersensor LH
41-Vordersensor not connected LH
42-Broken Vordersensor RH
43-Vordersensor not connected RH
44-Broken rear sensor LH
45-Behind sensor is not connected LH
46-Broken rear sensor RH
47-back sensor is not connected RH
48-battery voltage is not okay
55-defect control unit
56-reading with "ausblinken" failed
74-lot impact on warning in the instrument block