Toyota Highlander 2017–2019 — technical service bulletin
Bulletin 19TC04 -Region L · NHTSA communication 10172346 · issued Jan 30, 2020
Technical service bulletin
communication type
Engine
component
2017–2019
model years
3
vehicle entries
Official summary
Region Letter: The involved vehicles are equipped with an engine oil cooling system. The oil cooling system could experience a small leak due to a manufacturing issue. If a vehicle is continuously operated with this condition, it may result in abnormal engine noise, illumination of the Malfunction Indicator Light (MIL), and an engine oil level low message. Over time, an oil pressure warning message may be displayed on the multi-information display and/or a buzzer may sound.
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.