My 2 cents is that C102B shows up as Right Rear Speed Sensor wiring being faulty. I have the same issue on my gf's car right now and I just replaced the sensor with that not being the cause. Now on to the wiring as we speak..
99TJ 4" OME Lift, 1" Daystar Poly body lift, Discos, Locker, Atlas 2 3.8:1 Tcase, 33" Super Swampers, FlowCrapper Exhaust, Flush LED tails, Delta housings with HID's
99XJ 4.0 4.5" Rustys, 31" Treadwrights, flowcrapper blah blah blah, and a 6ft6 western unimount.
2001 XJ 4.0 4.5" Rustys, 33" BFG MT's, JKS, 8.25Locked, Rusty's 50 series Flowcrapper exhaust, Rustys Motor/trans mounts, Viair Compressor, Hella standard horns, Train horns, Delta housings w/55W HID's, CB, and soon to be stroker 4.6L