Hey everyone,

I recently had a P0128 code come up on my 2004 3.8 Monte Carlo to replace the engine coolant temperature sensor. The check engine light was on for about two weeks, but just this morning the check engine light has gone off. Any ideas why? I do live in MI, during those two weeks it was 15 degrees or colder, we just had a day yesterday that about 25 degrees, not sure if that matters or not.

Thanks in advanced,
AJ

 

I had the same code a couple of weeks, not sure if it was due to the frigid weather or not. I ordered a new coolant temperature sender. Of course since the part came in I have not had that code appear!