Ford Expedition 1997–1998 — technical service bulletin
Bulletin 12170 · NHTSA communication 613218 · issued Nov 1, 1998
Technical service bulletin
communication type
Engine and Engine Cooling
component
1997–1998
model years
4
vehicle entries
Official summary
Information concerning the octane shorting bar located on the passenger side of engine compartment near the bulkhead is not intended to be functional in reducing detonation/spark knock. *mjs
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.