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P0298 - Engine Oil Over Temperature Condition

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2007 Mercury Mountaineer, 2007 Mercury Monterey, 2007 Mercury Montego, 2007 Mercury Milan, and 2007 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.
P0298 - ENGINE OIL OVER TEMPERATURE CONDITION

Description:  Indicates the engine oil temperature protection strategy in the powertrain control module (PCM) has been activated. This temporarily prohibits high engine speed operation by disabling injectors, to reduce the risk of engine damage from high engine oil temperature. On engines equipped with an oil temperature sensor, the PCM reads oil temperature to determine if it is excessive. When an oil temperature sensor is not present, the PCM uses an oil algorithm to determine actual temperature. Engine shutdown strategy function is the same on vehicles with and without oil temperature sensors.
Possible Causes: 
  • Very high engine RPM for an extended period of time
  • Overheating condition
  • Damaged engine oil temperature (EOT) sensor or circuit (vehicles with an EOT sensor)
  • Base engine concerns
Diagnostic Aids:  The engine is operating in high RPM range due to incorrect gear selection. This may cause a lack/loss of power or surge.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All - - refer to PINPOINT TEST DY .
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