After my recent issues with two failing brake light switches generating an ABS FAULT & TRACTION FAILURE I thought my problem was fixed.

https://rangerovers.pub/topic/3982-abs-fault-traction-failure-fixed

Unfortunately I am fairly regularly getting ABS FAULT & TRACTION FAILURE while driving along. This isn't every journey or even every day but probably once every two or three times I take the car out. There is nothing I have seen that will definitely generate the fault e.g. it's not when I turn right or go over a bump. It can occur at any time but I drove 500 miles from Brittany to south of Biarritz & didn't get the error once. The brake light still works & the brakes seem powerful enough although I have never been in a situation where I needed the ABS when the fault is displayed.

If I switch off the engine the fault is cleared. There is no fault stored. If I connect the Nanocom while the fault is displayed then I cannot connect to the ABC ECU. It's probably one of the ABS sensors giving an intermittent false reading that the ECU cannot handle so it throws the fault but it's not easy to figure out which one. The whole right front hub with wheel bearing was replaced a couple of months ago so that's probably favourite.

The fault is occurring more often so I need to attend to it before it's permanent but does anyone have suggestions as to how I might identify the culprit? Of course it may not even be a wheel speed sensor but is the ABS ECU throwing a wobbly. Ideas...???

I chased the same sounding issue a while back.
ABS /TC fault, no error codes stored, intermittent issue.
Nano would read all the sensors correctly up to the 5mph cutoff.
Mine turned out to be a worn front wheel hub bearing that was allowing the reluctor to get just
far enough away from the sensor to trigger a fault.
Only found the bearing issue when I was checking tie rod end condition and the whole damned wheel was loose!
The wobble had pushed the sensor back a few mil as well.
Give the sensor a light whack and re seat it?

Good luck!

I can't see it being a wheel bearing problem. Nigel had a noisy front right wheel bearing so we replaced it with a used hub and half shaft assembly that had no movement in it and spun freely. The reluctor ring was cleaned before it was fitted too. I can't see that failing after such a short time. Contrary to what I was expecting, the ABS sensor came out of the old hub very easily and was coated in silicone grease before being pushed into the replacement. It may be that it has worked its way out slightly, just enough to give an intermittent error, so a light tap with a mallet might be all it needs.