i noticed on last flight the OAT was reading 103 F at 3000 Feet which was totally incorrect as airfield temp was only around 8 degrees centigrade.

Aircraft is a RV7 with a dual AFS 3000 installation not built by me. I have located the OAT sensor under the left wing root and it looks undamaged before I investigate further does anyone know the best way to test whether the sensor is faulty?