I just ask a ? about ABS & 4WD lights coming on together.

Either an ABS sensor has gone bad (not as likely) or, an ABS ring has a crack in it and needs to be replaced (more likely with age of vechicle). Rust on the end of half shaft expands and cracks these sometimes. ABS system sees crack and throws the code. You have to check each one and find the toothed ring on which ever wheel has this crack and then replace. These problems are probably separate but, if you fix one the other will be easier to define.