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I went to a repair shop to see why my cel light is on and they said it was a p0128 code and just by that determined it must be my thermostat. Isn't there something wrong with this, shouldn't there have been more of a diagnostic to find out the direct cause and not just guess that it's the thermostat? Also, I read somewhere that the 2.3 L mazda 6's don't have a serviceable thermostat is that true? I have a 2004 2.3 L mazda 6 btw.
 

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sorry for a bump on a old thread, but I just got P0128 this morning.
 

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bump. i got po128 too guys. but have had no issue with the engine temp at all. is it really the thermostat? im just hoping its a low coolant level..
 

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it was the thermostat for me. have fun chaning that. can't leave it takes 3+ hours when it is a 5 minute job on my truck.
 
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