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Service bulletin 18998

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10019064
Published by NHTSA2006-02-10
Manufacturer's number18998
Manufacturer's date2006-01-01
NHTSA componentELECTRICAL SYSTEM

NHTSA's summary

VARIOUS ELECTRICAL CONCERNS - 3 BLOCK AUXILIARY RELAY BOX 1 CHAFING - SERVICE TIP. *TT

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Electrical system

Vehicles listed
FORD EXPEDITION2005, 2006
LINCOLN NAVIGATOR2005, 2006

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
TSB 20-23072020-11-05. Service bulletin. Some 2003-2020 Expedition/Navigator and 2006-2020 F-150 vehicles equipped with TOD transfer cases may exhibit grinding/clicking/ratcheting noise from the front wheel area. This may be due to partial engagement of the integrated wheel ends (IWE). To correct this condition, follow the Service Procedure steps to remove and cap the vacuum supply line.
SSM 465422017-08-01. Service bulletin. When ordering a 2005 to 2008 remanufactured 5.4L 3v or 6.8L 3v engine, spark plug boots may be provided in the packaging. Replace all black spark plug boots from the original engine with the 'brown' spark plug boots, as provided. The updated 'brown' spark plug boots are longer than the black boots to accommodate a running change in the spark plug length. The ignition coil bodies and spring/resistor are transferable and only the rubber boots require replacement. Failure to install the spark plug boots provided with the replacement engine could lead to drivability concerns.
TSB-12-8-12012-12-12. Service bulletin. FORD/LINCOLN/MERCURY: MAY HAVE SLUDGE BUILDUP IN THROTTLE BODY LEADING TO LESS AIRFLOW OR ENGINE IDLING RPM FLUCTUATION AND HARD STARTS OR BATTERY DISCONNECT OR DEAD BATTERY AFTER KEEP ALIVE MEMORY (KAM) CLEAR. MODELS 2003-05 THUNDERBIRD, 05-06 MUSTANG, 06-08 FUSION, 04-05 EXPLORER, 05-06 EXPEDITION, 05-07 F-150; 2003-06 LS, 06 ZEPHYR, 05-06 NAVIGATOR; 06-08 MILAN. *PE
0523172006-03-13. Service bulletin. DIAGNOSTIC TROUBLE CODES P0340/P0344/P0345/P0349 - 4.6L 3V AND 5.4L 3V. *TT
041472005-12-07. Service bulletin. SERVICE WIRING HARNESS REPLACEMENT GUIDELINES - SERVICE TIPS. *TT
183902005-04-14. Service bulletin. DELAYED CRANKING WHEN KEY IS TURNED TO START. *TT
181722005-01-18. Service bulletin. REVERSE SENSING SYSTEM DEFAULTING OFF, SETTING DIAGNOSTIC TROUBLE CODES, OR LOSING COMMUNICATION WITH DIAGNOSTIC SCAN TOOL. *TT