On the 2000 Dodge Durango, the P1281 is “Engine is Cold Too Long” – this is most commonly due to a Thermostat that is stuck in the “open” position. First thing to do here is to replace the Thermostat and fill the system to the correct level. Next, the Engine Coolant Temp Sensor should be tested for proper operation and replaced as needed. But, like I say, most commonly- Thermostat is stuck open.
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