I just finished replacing both front hubs complete with ABS sensors. The two rear hubs and sensors have also been replaced. I have the three amigos plus the brake light on. The only remaining fault according to my Hawkeye scanner is: Fault 4022 Reference earth NOT connected to the ground.

Any ideas on how to remedy this? Thanks!

 

I've never seen this particular error, but it sounds like it's missing a ground on the ABS module. Look at a wiring diagram for the module. Check any and all wires that are grounds. You can back probe them at the module connector. Then connect a test light to battery positive and touch the test light to them. If it doesn't light, that wire may be your problem.