VR VR Running Hot

[Brutus]

Hope some one can help?
VR V8 X Chaser Auto Runs great while ever the days are cooler, when the tempreture gets hotter the car runs rougher uses more petrol and smells like its running to rich. I think its one of the sensors breaking down any suggestions? PS has new radiator.

 

[HATER VP]

Have you checked the fault codes?

 

[Brutus]

To be honest I did not know anything about fault codes! I am now gathering information on how to check them.