Toyota Highlander 2017–2022 — technical service bulletin
Bulletin TTT069822 · NHTSA communication 10220186 · issued Jun 20, 2022
Technical service bulletin
communication type
Engine and Engine Cooling
component
2017–2022
model years
10
vehicle entries
Official summary
TT: Some 17-22MY Highlander and 17-20MY Sienna vehicles may experience a MIL ON condition with DTC(s) P042000, and/or P043000. This issue could involve deteriorated catalyst material from the bank 1 or bank 2 catalytic converter.
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.