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Welcome, I'm Chris (aka Moose) I'm an independent contractor here at Just Answer.
It would help alot if you had it scanned to see which codes are stored. Has that been done?
Thanks for asking your question and letting me try to help you.
Using your same scan tool, can you monitor the wheel speed sensor reading while backing up to see if any are not reading the same speed as the others or have a hiccup in there reading?
When do you believe you can have this test done so I have the most information available to answer accurate?
Super, just report back when ready.