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Q: Speedometer isn't working

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The speedometer isn't working, and the Check Engine Light is on.

Hi. If your speedometer is not working, and your Check Engine Light this may be a sign that your speedometer sensor has failed. As the speedometer sensor is located in the transmission, underneath the vehicle, I would recommend having the vehicle looked at by a professional technician, such as one from your mechanic, and replace the failing speedometer sensor.

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