The outside temperature sensor in my 1994 E320 Wagon seems to read about 20 degrees low. Is the sensor bad? If so where is the thing? I have a junk yard up the road I can try and locate another one up there.
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Drives: '91 C124 300CE,'06 ML 500 W164, '00 BMW MCOUPE, '65 COBRA REPL.
I have not dealt with this issue personally, but I do not see that the ECU is the issue.
The ECU does not care what the outside temp is, only within the engine thus the coolant etc.
I would say it is the sensor.