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code 42 speed sensor help!

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BlueSteel

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I keep getting code 42 when I do a code jump. 4 blinks pause then 2 blinks. The book says its my speed sensor but my speedometer works fine. I thought maybe my boost controller was screwing it up because the AVC R has you connect into that wire for installation so I disconnected it. That seemed to work for about a week then the code came back. Does anybody have any ideas before I spend money replacing the speed sensor.
 
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BlueSteel
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