My check engine light came on. the code says that temp is below thermostat level

I think I'll change the thermostat since its a cheap fix and see if that helps. Any idea which temp thermostat I should get? I saw 3 or 4 different temp thermostats for my year car.

You need to install the Factory Temp 192 Degree or the vehicle will never go into close loop if you use a cooler range thermostat