Jeep Grand Cherokee 2004 — technical service bulletin
Bulletin 1803203 · NHTSA communication 10003987 · issued Sep 12, 2003
Technical service bulletin
communication type
Engine and Engine Cooling
component
2004
model years
1
vehicle entries
Official summary
Erroneous diagnostic trouble codes (dtcs) reading to 4.0l oxygen sensor heater failure. *tt
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.