I have a 2005 Volvo S40 2.4L and the outside temperature gauge is about 20 degrees low at all times. Some of the little information I could find revealed that this could be a problem with the sensor itself or it could be related to a technical service bulletin that would run 5-6 hours of labor at a shop. But I couldn't find any information specifically related to a 2005 S40.

Where is the sensor located on this car? Is it the drivers side mirror? Could I just order a new sensor and replace it? I would just take it to a Volvo dealer for an estimate on the issue but the nearest dealer is about 250 miles away.

 

yes it is in the driver side mirror. open it up and check the connections for corrosion