Hi my outside air temperature is going crazy. It reads an outside temp of about -58. Now it only did this after heavy rain so I figured the outside temperature sensor had a short. So I actually tried just unplugging the radiotor sensor to see if it will give me a different read, but same thing.

After searchng the forums I found there is a second outside air sensor, but I can't find it anywhere. Someone said it is in the "Plenum chamber" and you can access it by removing your cabin air filter, but I don't see anything. Can anyone show me a picture or something of where this air sensor is? Thanks a bunch...oh yeah it is a 99 A4 1.8T Quattro.

 

Its called the fresh air duct temp sensor, i believe you have to remove the right side A/C vent to get it out. I would replace the main exterior temp sensor behind the bumper first.