94 Legend speed sensor

The D4 light on the dash started blinking recently, along with the speedometer acting strangely (like randomly dropping to 0 mph while I'm driving 40. Apparently this is due to the speed sensor going bad, which I
guess is not uncommon.
How difficult is this to replace?
Thanks for any advice.
-Gary
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I have exactly the same problem. Same year and model, same indications. It is intermittent for now.

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speed sensor. how difficut is to replace?
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