Just got back from the dealer after a check engine light and they scanned it and told me the code was P0125 or a bad thermostat. Then they quoted the price as 400 to get it replaced because they charge 90 an hour for labor. How much of a challenge is it to replace this part on my own/has anyone done this fix before and have some helpful tips?

Thanks,
Jimmy

Black '04 GT with Black/Red leather

 

Here you go.