Toyota ABS sensor replacement
 

Has anyone here replaced an ABS wheel speed sensor in a mid-90s Toyota?

My wife's '94 Camry has a bad LF sensor. Dealer wants $600. I see the sensors for $70 to $90 from on-line vendors. I'm wondering if there's something really nasty about changing this, or if it's just a high profit opportunity for the dealer. I don't have a shop manual, and have not yet crawled under the car for a look.

Ken