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It should be possible to test the sensors with an ohmmeter (I think) as they will likely be temperature sensitive resistors or thermistors.
Testing the voltage was the thing to do in the old days of analogue and direct current systems but I think you will find the electronics on your car is digitally based and difficult or impossible to test with an ordinary meter. An oscilloscope will probably be needed...
check near front bumper for a tiny black sensor somewhere near number plate the sensor seems loose or bad connection on wire ,not 100% sure where sensor sits but pretty sure its a bad connection on plug to sensor as it is a common prob on bmw when sensor loose /bad connection show minus 40deg when its hot outside and display plays up vw polos have same prob
The outside air temperature indicator's displayed temperature can be recalibrated. Press and hold the reset select button for 10 seconds . While you continue to hold the button, the display will scroll through temperature settings from +3 to -3. When the desired correction value appears on the display, release the button, and the recalibrated outside air temperature will be displayed. Each time a desired correction value is entered, it replaces the previous value. Give that a try mmkayyy:)
Had the same problem, replaced the ambient air temp sensor in front of the radiator. Cost is like 10-15 bucks. Don't worry if temp doesn't change right away. Took me about 5 miles and then it worked great.
For general awareness, the outside air temperature sensor is located above the inside mirror. Try to reset the temperature measurement unit:1. Switch engine on.2. Press and hold clock minute (min) and hour (h) buttons simultaneoutly longer than 3 seconds. The display will show new temperature measurement unit.
The exterior temperature display is built into the Automatic temperature control unit. or the A/C controls. Look at the buttons for the A/C unit and press the one that is marked "EXT". This will display the outside temperature.
Thanks, I will look into this!
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