External temp reading is wrong... can it be reset?

check your coolant. the temp is the water temp. Your radiator is out of water? you`ll burn out your water pump. Also check to see if your radiator fans are running constantly.

If you replaced the right sensor, there must be a problem in the wiring to the computer.
You did reset the computer - hit ac and recirculate buttons at the same time ??

If you can get a scanner hooked up with live data, it will tell you what your coolant temperature sensor is reading. It may be reading wrong.

Sounds like your temperature sending unit is bad. If you need instructions for replacing the sensor, please let us know.

if it is reading wrong al the time , replace the sensor. if reads off after car is driven sensor might have been moved to a spot near something warm and needs to be put back

Mine did the same thing. The thermostat was stuck open. Replace thermostat, the problem went away. If stuck open, it doesn't get to operating temperature when cold and indicates the engine is too hot when it's warm outside.

heater valve if you have 1 ,or temp control actuator which is under the dash and takes hours to replace!

You need a new temp censor for your vehicle

more than likely but if the temp gets to high you run an extremely high risk of blowing a head gasket or warping or cracking the head.So have it changed out before driving the car much more and also have the water pump checked.

try replacing the coolant temp sensor, if that doesnt repair it then may have a bad cluster or the wiring to sensor, try connecting two terminals together gauge should drop . hope this is helpful,