How 2 turn off the the reverse lights sensor once you replaced the bulb?

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The red light sensor on the dash board indicating your back up light are not working is still on. I replace the bulb, and now the back up light work but the sensor is still on. I notice it would be one then off, then a neighbor told me my back up lights on the passenger side did not work, so i had it replace. Now the dash sensor stays on all the time now. Both back up lights work now.