Replaced wheel bearing and speed sensor on RF, 2000 f350 diesel dually. Drove 1 month about 1000 miles, now I get c1145 and c1230 with abs light. Any ideas?

The sensor is attached to the output shaft of the transmission and should not be affected by the work that you did. Are the ABS sensors ok?

It could if the mechanic somehow damaged the sensor or the wiring.

Rear Speed Sensor Center Input Failure

Some type of abs speed sensor on rear diff

May be just dirty connnector

I googled it,would be here all night

Try Google ---2000 Excursion OBD2 Codes -C1230

The EBCM is looking for 1040-1160 ohms in the ABS sensor circuit. Check the two wires between the sensor and the EBCM. The wires in the area under the fender are prone to breakage caused by the flexing and turning of the suspension.

check the harness and connector

Possible when the HUB was changed that the sensor connection was damaged or was not taken care off . So please recheck with your work and the fault will be seen.

C1145 is a Right Front wheel speed sensor fault
C1175 is a Left rear wheel speed sensor fault.
P1000 System OBD check not complete since last memorie clear which mostlikely means that the car has not completed the drive cycle to set all monitors for the engine emissions. ( it may just need to be driven a more.
As for the wheel speed sensors if you have replaced them the ABS codes need to be cleared. the engine code reader and clearing tool will not do it. A scanner with ABS capabilities is needed. On some cars if you disconnect the battery and wait 3 mins then re connect the battery, that will clear all codes. then the car needs to be driven to set all monitors for engine emissions.
If you have already cleared the codes. and you have repete same codes for the ABS, you would need to look the wireing over for possible wire rubs that are causing the faults. or the ABS computer itself is at fault.

C1145 RH Front Speed sensor cct poss faulty sensor.
C1155 LH Front Speed sensor cct poss faulty sensor.
C1178 Unknown

Sorry can't be any more help than this

replace the speed sensor on the transfercase that should take care of this problem

Wheel Speed Sensor - Common problem

Have it scanned with an ABS capable scan tool.