Toyota Highlander 2001–2003 — technical service bulletin
Bulletin 04105 · NHTSA communication 10020868 · issued Sep 7, 2005
Technical service bulletin
communication type
Engine and Engine Cooling
component
2001–2003
model years
3
vehicle entries
Official summary
Ecm calibration update. Mil on dtc p0420 and/or p0430. *kb
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.