How to check which speed sensor is bad?

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by myothercarisahummer, Jan 21, 2019.

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  1. myothercarisahummer

    myothercarisahummer New Member

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    Hi guys, noob here. I have been reading a bunch of threads here in regards of speed sensors.

    I have a 2010 prius sedan and have had abs,brake light come on intermittently. Once they are on the ABS does not work, it would come on and off randomly.

    My questions are: they come on when they feel like it, when I scan the car with OBD there is nothing stored, can some one quickly reference me to how to check which speed sensor is bad? I know there are speed censors in front and rear.

    I cleared the OBD and took the battery off, have not had it come on for little while.
     
    #1 myothercarisahummer, Jan 21, 2019
  2. tankyuong

    tankyuong Senior Member

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    Abs scanner or tech stream
     
    #2 tankyuong, Jan 21, 2019
  3. ChapmanF

    ChapmanF Senior Member

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    Quickest way to the solution is probably to assume less about what the problem might be (speed sensors or whatever) and just read the trouble codes (using Techstream or, absent that, the Tc-to-CG jumper, so as not to rely on other code readers that might miss the codes).

    If it turns out the trouble is a speed sensor, there are separate codes for the four of 'em, so once you have the codes, then you'll know. Or, if the trouble is something else, you'll know that too.
     
    #3 ChapmanF, Jan 21, 2019
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