MacBook Pro 15" CPU Overheat
The sensor temperatures probably show °Fahrenheit instead of °Celsius.

Open iStatMenus -> Sensors and change the Degrees from Fahrenheit to Celsius.

The Palm Rest will show ~30°C instead of 85°F (mine - a similar MBP - has 31°C), the CPU Die will show 54°C  instead of 129°F (mine has ~63°C)...