Car: 2010 1.4 type S, Silver
Join Date: 8th December 2010
Location: Hampshire, where ponies rule the roads
Thanked 35 Times in 34 Posts
Whilst I agree that there is a problem with the outside temp sensor, especially when showing +45 when it is freezing outside, all the cars I've driven with a sensor shows a higher temperature than expected when returning after parking it for some time with a hot engine.
It is even worse on a hot sunny day. However, when restarting the engine and driving the car for a few minutes the temperature can drop by several degrees and remains fairly constant.
I don't know about earlier 8th gen civics but on the 09 upgrade it is possible to adjust the outside temperature reading by + 3 degrees using the trip computor menu.