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General E46 Forum
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Old 11-13-2013, 08:30 PM   #1
AvrgeJediMaster
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Join Date: Nov 2013
Location: SoCal
Posts: 31
My Ride: 04 330i
Outdoor Temperature Sensor

My outdoor temp usually reads about 15/20 degrees F low. On hot days it can get up to a 30 degree difference.

The thing is it still changes normally, it'll just say 24 degrees F when its around 40 degrees. Or 57 degrees when its 85 outside.

I checked the sensor when I washed my car today and it's still there, still plug it, no wires showing, so it seems intact.

Any ideas? Suggestions? I've googled and forum searched but i haven't found someone with the same problem. I just want to know if it'll affect the car, haven't noticed anything yet but I only driven it for 2 months. Not even sure if somethings been wrong since before i got it.
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Old 11-13-2013, 08:37 PM   #2
jdstrickland
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Join Date: Apr 2010
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My Ride: '94 325iC & '00 323i
I'm not sure, but I believe the temp probe is a thermocouple. It is either a thermocouple or a thermistor, and I think it's a a thermocouple.

In any case, the probe can suffer any number of issues that will cause it to read wrong. Thermocouples are more prone to this error than a thermistor is, which just reinforces my belief.

You are describing a bad temp probe.
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Old 11-13-2013, 08:41 PM   #3
TerraPhantm
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Only thing I can think of is the resistance is off... but that shouldn't be the case unless it's a poorly made aftermarket sensor. Or perhaps other BMW models have sensors that mount the same way, but with different probes inside. I think it's a NTC thermistor
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