Infiniti QX56 2011–2012 — technical service bulletin
Bulletin ITB13053A · NHTSA communication 10192408 · issued Jul 18, 2014
Technical service bulletin
communication type
Equipment
component
2011–2012
model years
2
vehicle entries
Official summary
IF YOU CONFIRM MIL "ON" with DTC P0420 and/or P0430 (Three Way Catalyst Function), ACTION: 1. Reprogram the ECM (if needed). 2. Replace three way catalyst and A/F sensor. See this bulletin for further detail.
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.