I have A 2004 Jeep Grand Cherokee reading code p1281

I have A 2004 Jeep Grand Cherokee reading code p1281 what is it and how do I fix it . I know it is a factory direct code it says fuel air metering p1281

Answer:

This code actually means the engine stays cold too long. This could be caused by extremely cold weather, malfunctioning ECT sensor, or a thermostat that does not let the engine warm up. In most cases, replacing the thermostat will fix this issue.

SYMPTOM P1281-ENGINE IS COLD TOO LONG WHEN MONITORED The ignition key on, engine running, Ambient Temperature greater than 20°F ; and Vacuum is less than 17 inches Hg . SET CONDITION The engine does not warm to 85°C (181°F) while driving for more than 3 minutes and less than 1 hour depending on Engine load and Start up Temperature