Dealer: $1,800 to replace rear ABS speed sensors on 2010 Yaris sedan

[stormhighway]

My 2010 Yaris sedan hit 266,000 miles this month. The ABS, Traction Control/ESC and brake lights on the dash lit up a day after a big snowstorm here. Driving during that storm, the ABS activated normally dozens of times at lights, stop signs, etc.

A day after the storm, the ABS activated twice on dry pavement while slowing to a stop in a parking lot (low speed). Not long afterward, the aforementioned dash lights came on.

I took it to the dealer for diagnostics. The codes indicated both rear ABS sensors were bad. The sensor and hub are one inseparable unit. The quote to repair was $1,800 with *no promise it would fix the problem*. Both rear hubs have been replaced before, the driver's side in 2013 and the passenger side in 2017 - both due to bearing failure. There have been no ABS issues with the car before. The OEM hub has a 12-month warranty, so both are not covered now.

I declined the repair, took the car home and removed the wheels myself. I could have easily removed the hubs, but didn't have a 9/16" wrench that could take the torque needed to remove the hub bolts. The OEM part is $320, aftermarket ones are much cheaper.

Reading the forum, I see that pin corrosion is a common cause of this failure. But both sensors going bad at the same time, including one Toyota OEM just 16 months old?

It seems this is an easy DIY if I buy the parts and install them myself. But that $1,000 labor quote to swap them out at the dealer - why so much? Am I missing something else that needs to be done to this system to justify so much labor cost?