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I had a similar problem except mine stayed at -35F. You can remove the sensor (drivers side front bumper) and jumper the connections which should cause the temp to rise slowly to a very high temp maybe 150F. It can take some time to rise up to several hours I think. If jumpering the sensor connections has no affect on the obc temp then you have an open connection somewhere. If it does cause the temp to rise I would suspect the sensor is bad.
On my car I had an open circuit. There is a large round connector behind the plastic panel for the headlights in the engine bay. Turned out the sensor wire had corroded out of the connector. I removed the connector tip, soldered in a short piece of wire, replace the tip and soldered the short piece of wire to the original temp probe wire.
Craig
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Craig Dinger
'02 Sampson Titanium, Campagnolo 20 speed roadbike, daily commuter, 3,700 miles and counting
'71 911 T Targa for fun
'89 BMW 325i sedan wife' ride
'83 BMW 533i White/Cardinal red leather, Wet weather commuter
'89 BMW 535i auto to 5 speed conversion in progress
'98 Ford F-150 weekend hauler
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