NHTSA Investigation
SQ00016
WHEEL STUD AND NUT
Key Takeaways
- Investigation SQ00016 currently maps to 1 tracked vehicle-year page across 1 make.
- This page summarizes the public investigation subject, status, timing, and affected tracked vehicles linked from NHTSA source data.
- The linked component on this record is wheels.
What This Investigation Page Shows
This page summarizes a public NHTSA investigation record tied to one or more tracked vehicle-year pages in our database. Investigation records sit between owner complaints and recall campaigns: they can remain open, close without a recall, or connect to a later remedy action. Use this page to see which tracked vehicles are linked to the record, then open the individual vehicle pages for complaints, recalls, and crash test context.
Investigation Summary
IN DECEMBER 1999, FORD ISSUED TECHNICAL SERVICE BULLETIN 99-26-3, ENTITLED INCREASED WHEEL NUT AND STUD SIZE-SERVICE TIP,FOR 2000 MODEL YEAR EXPEDITION, NAVIGATOR, AND CERTAIN F-150 VEHICLES, BUILT ON OR AFTER NOVEMBER 27, 1999.THESE VEHICLES HAVE INCREASED WHEEL STUD AND NUT DIAMETERS FROM 12MM TO 14MM.THE WHEEL NUT TORQUE WAS INCREASED FROM 100 FT-LB. TO 150 FT-LB., RESPECTIVELY.ODI HAS RECEIVED THREE REPORTS OF WHEELS SEPARATING FROM 2000 MODEL YEAR EXPEDITION VEHICLES, INCLUDING TWO CRASHES.TWO ADDITIONAL REPORTS ALLEGE BROKEN STUDS AND/OR LOOSE WHEEL NUTS.LOOSE WHEEL NUTS CAN ALLOW THE WHEEL TO WOBBLE AND CAUSE WHEEL STUD BREAKAGE.THERE ARE NO SIMILAR ODI REPORTS ON 2000 MODEL YEAR LINCOLN NAVIGATOR VEHICLES.THE FAILURES APPEAR TO BE ATTRIBUTED TO IMPROPER WHEEL NUT TORQUE; HOWEVER, THERE IS NO EVIDENCE THAT THERE ARE TORQUE QUALITY DEFICIENCIES AT THE ASSEMBLY PLANTS.DUE TO THE MILEAGES THE INCIDENTS OCCURRED, IT IS MOST LIKELY THAT IMPROPER WHEEL NUT TORQUES WERE APPLIED DURING SERVICING, BECAUSE IN ALL CASES WHEN LOOSE WHEELS WERE RE-TORQUED TO A LEAST 100 FT-LB., THERE WERE NO FAILURE RE-OCCURRENCES.
Manufacturer listed on the source record: Ford Motor Company
Component listed on the source record: WHEELS
Affected Vehicles (1)
| Year | Make | Model |
|---|---|---|
| 2000 | Ford | Expedition |
Browse Affected Vehicles
Affected Models
Affected Years
All data is sourced from NHTSA public records. This site is not affiliated with, endorsed by, or operated by the National Highway Traffic Safety Administration or any government agency. Complaints are unverified consumer reports submitted to NHTSA and may not reflect confirmed defects. For official information, visit nhtsa.gov.
Latest vehicle import recorded anywhere on this site: Oct 8, 2026. Individual vehicles and datasets may have older records; this is not this page's update date.