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Pinpoint Test Q: DTC C1998 - Module Calibration Not Complete: Testing
WARNING: This page is about a different car, the 2003 Mercury Mountaineer and 2003 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
The Advance Trac®/IVD lamp will flash when a system calibration is required. Calibration is required after certain DTCs are cleared.
Courtesy of FORD MOTOR CO.