Strange OBC reading
 

Had a strange outdoor temperature reading on the OBC yesterday during a drive. It alarmed and bonked with a displaced temperature reading of -26 deg. F. I'm in the SF bay area and the temp. was 57 deg F. This has happened one other time about two months ago. The temperature reading would slowly climb up during the drive, it took about 10 minutes before it reached the normal temp.

Is this an indication that the senor is failing? or the OBC? Anyone else experienced this? I have a 92 525ia M50.

Thanks in advance,
glen-sj:confused:

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

Thanks CraigD.