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Home >> Mercury >> 2009 >> Sable Premier, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1255 (Engine Controls - Powertrain DTC Charts & Descriptions (Except Diesel & Hybrid)) >> DTC Diagnosis >> DTC P0125: - Insufficient Coolant Temperature For Closed Loop Fuel Control

DTC P0125: - Insufficient Coolant Temperature For Closed Loop Fuel Control

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2009 Mercury Mountaineer, 2009 Mercury Milan, 2009 Mercury Mariner, 2009 Mercury Grand Marquis, and 2009 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0125: - INSUFFICIENT COOLANT TEMPERATURE FOR CLOSED LOOP FUEL CONTROL

Description:  Indicates the engine coolant temperature (ECT) or the cylinder head temperature (CHT) sensor has not achieved the required temperature level to enter closed loop operating conditions within a specified amount of time after starting the engine.
Possible Causes: 
  • Insufficient warm up time
  • Low engine coolant level
  • Leaking or stuck open thermostat
  • Damaged ECT sensor
  • Damaged CHT sensor
Diagnostic Aids:  Compare the thermostat specification to the actual ECT using the engine temperature PID (ECT or CHT). The temperature reading should be similar when the engine is at a normal operating temperature.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
Explorer 4.0L,
Explorer Sport
Trac 4.0L,
Fusion 3.0L,
Milan 3.0L,
Mountaineer
4.0L,
Mustang 4.0L,
Ranger 4.0L
- - GO to Pinpoint Test DX .
All others - - GO to Pinpoint Test DL .