C1998 on the 2004 Ford Expedition
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
This code is specific to a manufacturer and is not described here. Its meaning is in the manufacturer's service information.
| 17168 | 2003-11-17. Service bulletin. VEHICLES EQUIPPED WITH ADVANCETRAC STABILITY ASSIST/INTERACTIVE VEHICLE DYNAMICS - IVD) MAY EXHIBIT A DIAGNOSTIC TROUBLE CODE C1998. *TT |
|---|
1 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.