DTC P0128: - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
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 P0128: - COOLANT THERMOSTAT (COOLANT TEMPERATURE BELOW THERMOSTAT REGULATING TEMPERATURE)
| Description: | Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine. | ||
| Possible Causes: |
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| Diagnostic Aids: | Refer to THERMOSTAT MONITOR for system information. | ||
| 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 . |