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Thread: Ambient temp sensor periodically shows wrong temperature.

  1. #1
    Join Date
    Apr 2018
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    Norway
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    X3 F25

    Ambient temp sensor periodically shows wrong temperature.

    I have a X3 F25 2013 model where the outside temp sensor shows different wrong outside temperatures from time to time. It´s different values from time to time when it shows wrong temperature. Could be as simple as a faulty sensor, or should it then be showing a fixed minus degree temperature (with short circuit, loose cable or similar)?

    Anyone with the same kind of issues?

  2. #2
    Join Date
    Jul 2011
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    Arlington, VA
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    2018 BMW M240i
    Most likely it’s a bad connection at the sensor. The sensor is a thermistor, a resistor that varies in resistance as the temperature varies. That is, as its temperature increases it’s resistance decreases. Check the connectors for corrosion and loose pins.

  3. #3
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    Apr 2018
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    Norway
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    X3 F25
    Thanks a lot, checking!

  4. #4
    Join Date
    Apr 2018
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    X3 F25
    BMW service installed new sensor and new connector, but I still have the same problem.. Any tips?

  5. #5
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    Has the car ever suffered damage to the front end? Are you faving an other electrical or electronic problems?

  6. #6
    Join Date
    Apr 2018
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    X3 F25
    No damage on the car, and no other electronic problems..

    Btw, a month ago the car thought both left side doors where open so it was impossible to drive. But that issue never came back..

  7. #7
    Join Date
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    Hmmmm, how old is the battery? Are you having any other electrical issues. Modern cars are rolling computers. Whacky voltages cause whacky issues.

    I’m betting there’s a bad connection somewhere between the sensor connector and the electronix. Also, how hard is it to inspect the repair work? We all make mistakes. Many the tech didn’t do a perfect job.

  8. #8
    Join Date
    Apr 2018
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    X3 F25
    Battery is 5 years. Where is the other end of the temp sensor wiring connected?

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