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Location: Portland, OR
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On ODB-II systems, if the coolant is taking too long to reach conditions/ temperature required for closed loop operation it will throw a code.
Very similar to if the t-stat was stuck open and not allowing a normal warm up cycle interval.
Or, conversely: the t-stat opens too soon and coolant temp is dropping below normal operating parameters. With the 180* stat and colder ambient temps, that might be the case.
Or: the particular t-stat you have is closing late and allowing a drop below 180* coolant. Might be time to check the t-stat if its working properly.
If you have EVIC, you can get to the 'easter egg' screen and observe what coolant temperature the vehicle system is seeing. Could even be a water temp sender a bit out of spec too...
2009 R/T 27J pkg (6 speed MT) ordered 7/17/08, born 10/23/08, home 11/13/08
Eibach Sportline Suspension * Hotchkis Sway Bars
Razor's Edge rear tension arms * Nitto 555 Extreme 265/50-18"
392 Cam & DiabloSport CMR tune
Hurst /G&K modded short-throw shifter
'70 Challenger R/T graphics (hood/bodyside) * Black gauge faces, lighted needles