I get both of these codes. Since I have the C1095 pump motor circuit failure, I assume that means I've got some soldering to do. Since that one trips, is it even worth trying to change the LF wheel speed sensor and wiring for the C1155?

 

Try a test of the sensor and cable:

Put the front on jack stands, disconnect the battery, then unplug the big connector to the abs module.
Check the resistance across #17 & 18 in the diagram linked below. It should be around 1000mohm. Rotate the wheel and you should see the resistance vary as the teeth on the eluctor pass the sensor.
Turn the ignition key to unlock the steering and the turn the steering wheel from lock to lock and see if the resistance remains steady, also work the sensor cable around by hand to check for an open circuit.
It's also possible that the 1155 is caused by fault within the module. I had to replace one on my 97 fot that reason.

ABS Sheet XK8.pdf (application/pdf Object)

 

Thanks, RJ237. Is there a chance the wheel speed sensor could cause the C1095 code?

I guess my original question was that if the ABS light will stay on until I address the module, is there any reason to attack the wheel speed sensor? If I do this, will I still have the light and one code instead of two? If so, it seems like I can wait on the wheel speed sensor until I fix the module?

 

There is a chance that the ABS module itself can cause a C1155 DTC.

I have TWO ABS modules that show a HARD FAULT C1155. (will NOT clear, faulty output semiconductor)

I swapped the module to a 'known-good' car and the DTC C1155 was present. I tried to clear the fault. (still present)

Threw the module in the dead parts bin and replaced it with a 'good-used' part.

The LINK harnesses are more likely to fail than the sensors themselves.

 

^^ What he said. Always check the condition of the wheel speed sensor wiring harnesses first. They tend to degrade from stress and the passage of time....

 

Plus they are constantly MOVING when you drive.

 

Recently purchased my 2000 XK8. Had problems w/ Restricted Performance/yellow light/red light. Very rough idle. My Jag mechanic (first class independent) got a C1095 code (ABS hydraulic pump). He disconnected the ABS and the car ran smoothly.
I'm a new owner and surprised the ABS module would cause a rough idle. Having it rebuilt altho repairs sound pretty simple.