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Old 11-15-2013, 12:59 PM
james.e30 james.e30 is offline
Registered User
Location: Huntsville, AL
Join Date: Dec 2012
Posts: 41
Mein Auto: 2003 X5 3.0i
It looks like P112B is a Coolant Temperature Sensor code. That would explain your wonky temperature readings. Check the electrical connections to the sensor, if that doesn't do it you may have to replace the sensor.

Also, if your coolant was low you should bleed the system when you top off. There are directions in this post.
e53 2003 X5 3.0i - 9/03 Build Date
e30 1985 318i - Retired
BMW CCA Member # 304467
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