Need help with details on how to remove ABS sensor on the front wheel hub removed on a '99 Accord sedan? There bolt is easy to remove but the sensor
looks like it needs a special tool to remove the ring on the backside?

 

clear as mud?

 

Nice picture but doesn't answer my question.

 

sensor should just pull out, might have to twist it a bit. why are you replacing? swapping out hub/knuckles?

 

After that bolt is out, then the sensor is probably just stuck with corrosion. Soak with penetrating oil.

Have you got ABS error codes and checked whether it's actually a bad sensor?