Just an update.
Put all back together with new reluctor ring and.....exactly the damn same! All 3 lights still on and dis and inpa show no reading from back left wheel, all others and steering angle seem fine
Maybe im looking at a dsc module?
Id love first to be 100pc sure this new ring is working, so plan to do some playing with the multimeter again to see if i can be sure.
Am i right in saying i set the meter to ohms, and attach to the two pins of the sensor, and when i spin wheel the resistance should flicker?