OBC Temp reading incorrect

I recently replaced the OBC on my 91 e31 (bad pixels) and noticed since then the outside temp reading has been 8-12 degrees F warmer than the actual outside temp. Is there a way to reset or calibrate the thermometer?

Gatordan
91 850i 47k miles

Here's the sensor itself draped over my bumper:

To get to it, you can either remove the left headlamp assembly or come at it thru the left front wheel wheel by removing the fender liner and reaching forward and up. Here's how it looks when the light assembly is removed, for navigation purposes:

As you can see, it samples the airflow running through the left brake cooling duct. It's a press-fit, and due to the rather lousy quality of the plastic adapter, tends to fall out and then start sampling the under-hood air temps! I pushed mine back into it's adapter and then secured it in place using a tie-wrap, good and snug.

Sorry about the quality - fast snaps using an analog camera.

Mark