This is due to failing the calibration test.Perhaps you can reprogram it or will have to return for sevicing. here is the brochere link. http://www.escortradar.com/pdf/8500x50manual.pdf
I have an Escort Passport 8500 X50 which I have owned for apx 2 years. It now occasionally sends a...
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I have an Escort Passport 8500 X50 which I have owned for apx 2 years. It now occasionally sends a message that maintenance is required. What should I do ?