Infiniti Q50 2017–2019 — technical service bulletin
Bulletin ITB19-007 · NHTSA communication 10158424 · issued Mar 5, 2019
Technical service bulletin
communication type
Equipment
component
2017–2019
model years
12
vehicle entries
Official summary
INFINITI; P0171 AND P0174 SERVICE INFORMATION SERVICE INFORMATION Diagnosis for DTCs P0171 (FUEL SYS LEAN B1) and P0174 (FUEL SYS LEAN B2) have been revised for the APPLIED VEHICLES listed above. When performing diagnosis for either of these DTCs, start by using the SERVICE PROCEDURE section of this bulletin. NOTE: The related Electronic Service Manuals (ESM) will be revised in the future to include these diagnostic steps.
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.