Acura TLX 2015–2017 — technical service bulletin
Bulletin B19-049 · NHTSA communication 10164056 · issued Aug 14, 2019
Technical service bulletin
communication type
Engine and Engine Cooling
component
2015–2017
model years
3
vehicle entries
Official summary
Service Bulletin - The MIL comes on with DTC P0420 (rear bank catalyst system efficiency below threshold [bank 1]).
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.