Mountaineer 4WD V6-4.0L VIN E (1999)
Oil Change Reminder Lamp: Description and Operation
Oil Life Warning (CHANGE OIL SOON or OIL CHANGE REQUIRED)
If the connection to the oil temperature sensor is open circuit or shortened, the message center display will read "0, Temperature Signal Error," instead
of "Percentage Oil Life Left," during system check sequence.
One of these warning messages is displayed when the engine oil life remaining is five percent or less.
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When oil life left is between five percent and zero percent, the "CHANGE OIL SOON" message will be displayed.
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When oil life left reaches zero percent, the "OIL CHANGE REQUIRED" message will be displayed.
The message center indicator will indicate the percent of oil life left during System Check. This percentage is based on the driver's driving history and
the time since the last oil change. In order to ensure accurate oil life left indications, the driver should only perform the OIL CHANGE RESET
procedure, as described in the Owner Guide, after an oil change.
To calculate the percentage of oil life remaining, the oil life feature uses:
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The oil temperature sensor input.
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The tachometer input from the Ignition Control Module (ICM).
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The Vehicle Speed Sensor (VSS) input.
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Clock time (maintained internally by the message center).
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The oil life will decrease from 100 percent to 0 percent in no more than 12,068 km (7,500 mi) or 6 months. It will reach zero percent sooner
under different driving conditions.
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The percentage of oil life left is the second display in the system check sequence.
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When oil life left is between five percent and zero percent, the "CHANGE OIL SOON" message will be displayed.
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When oil life left reaches zero percent, the "OIL CHANGE REQUIRED" message will be displayed.
