Here is some BCM BATTSCI bus data I captured of the temp sensors being manipulated.
1st PTC sensor faked and resistance increased with a pot until IMA light P1449 occurs.
2nd The four temp sensors heated with hot air gun until IMA light & P1568 occurs.
I noticed that heating (Virtually melting) individual sensors had no effect.
Even two or three had no effect. All four had to be heated together to generate the error.
I haven't looked at this data yet myself.
www.solarvan.co.uk/bcm/TempData.zip
I need to look for the fan point as well just for info.