I had the same thing. Coolant sensor stuck high (high temp)
I wouldn't jump to the conclusion / decision to replace it. First visually check your coolant level making sure its between min an max. Then just have it reset at a local autozone or something if you can. See if it comes back. If it does, the sensor could just be bad (not too uncommon).
Last edited by DUI Elite; 12-09-2012 at 05:54 PM.