Can 2002 Sienna rear hub speed sensor be replaced?

bostonoriolebostonoriole Member Posts: 53
edited November 2014 in Toyota
Can the speed sensor on the 2002 Sienna be replaced. I am getting a bad speed sensor code, and my mechanic says the whole hub has to be replaced to fix it. Yet I see the speed sensor part in on line catalogs.

Is braking unsafe without the speed sensor functioning?
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