Hello, anyone know if cable harnesses of the outside temperature are the same for the models W126 and W201 ? I know that the displays are different but i dont have information about the cables. Please let me know if anyone have that information. Thank you and good luck

I believe you already suspect the most common issues. You will need to check with an OBD2 reader.

Temperature Display
The inside rearview mirror supplies a 5 volt signal circuit and low reference circuit to the ambient air temperature sensor. The inside rearview mirror monitors and records the voltage on the signal circuit of the ambient air temperature sensor. The inside rearview mirror uses this recorded voltage to display the temperature on the temperature display portion of the compass/temperature display. The temperature display will show "ICE" when the ignition is first turned on and the current temperature is 3°C (37°F) or below. The display will toggle between "ICE" and the actual outside temperature for approximately 4 minutes.
The mirror will display "OC" if the mirror senses a temperature of less than -40°C (-40°F).
the mirror will display a "SC" if the mirror senses a temperature of greater than 112°C (143°F).



Replace the inside rearview mirror with compass. Refer to Inside Rearview Mirror Replacement .

the sensor is located in front of radiator if you open hood and look down behind front bumper you should see it, or look from under the frt bumper, it easy to change, also get part from dealer it not $$,hope this helps.

It should be attached to the front of the lower radiator support behind the front fascia. Look for the two wire pigtail harness hanging loose if the sensor is missing or you can't find it.

there is a outside temperature sensor inside the lower front bumper
check wiring harness to sensor, or the sensor is defective

bpagett: the component you are referring to is called an "AMBIENT SENSOR". It is located behind the front bumper cover on the radiator core support near the center of the vehicle. The part is about 2 inches long and bullet shaped. It has the wire harness plugged into it. Sorry I don't have a part number for you.

If yours is the same model as mine (W201, 1993 model) on the left rear underbelly, just ahead of the left rear axle you will find a sub-assembly of the fuel pump and fuel filter. Caution, there is no way to isolate the fuel line, so if you're going to replace it, do the job on an almost-empty tank.

There aren't many people dealing with the W126 these days. The best place is ebay. Otherwise you could end up paying a small fortune at a specialist dismantler. But before you leap, look up the parts for the E class W124, many items were the same. Good luck

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.