Jeep Grand Cherokee 1999 — technical service bulletin
Bulletin 184498 · NHTSA communication 603139 · issued Dec 18, 1998
Technical service bulletin
communication type
Engine and Engine Cooling
component
1999
model years
1
vehicle entries
Official summary
Some vehicles may exhibit a sag/ hesitation following a cold engine start or partial cool down re-start, could be caused by the oxygen sensor entering closed loop prematurely/is experienced within first 30-40 seconds into the drive cycle. *ak
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.