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Help us help you better...where did you get this code read...or what tool did you use to read the code and decode the description? There are multiple scanners/readers and some have their own table that might give more details than a generic tool. The "A" could stand for multiple things depending on the maker/brand of the tool that was used and the table that you got the info from that said it was for a wheel speed sensor.

Do you have any visible symptoms or issues...like other warning lights besides the CEL/SES light etc? If you do, please add them to the discussion...it may provide clues to guide us to making better suggestions or ideas. :)

We have to depend on the data/info/details given by the poster to paint the picture and fill in any details since we aren't present with you. :)
 

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That is an OBD II code and the 'A' is a generic code for a sensor. You need better software to read the ABS module to see which sensor is defective. That is the first code I encountered on my car several years ago. I cleaned all 4 sensors and fixed some cracks in the wiring on one. This resolved the issue.
 
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