I'M getting a P0128 code. I've changed the thermostat twice in the last year.

What is your question?

It gives the code quite often, I used OEM Thermostatso. What could be causing this problem? Thanks.JAK.

What makes this problem better or worse?

It stays the same, nothing make it better or worse.

How long has your 2002 Dodge Durango had this problem?

A few months.