P0171 on Nissan vehicles The engine is running lean on bank 1: too much air, or not enough fuel, for the mixture the computer wants

A model year is listed because the code is named in its own record — a bulletin filed against it, or an owner’s complaint about it — not because every one of these vehicles sets it. Counts are documents in NHTSA’s files, not failure rates.

Bulletins and campaigns Nissan filed with NHTSA whose summary names P0171. Quote the document number at the service desk — it is a diagnosis the maker has already written down.

• NTB19-022 Service bulletin
  2019-03-05 · Equipment
• NISSAN; 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 in
• NTB19-030 Service bulletin
  2019-04-04 · Fuel System, Gasoline
• 2016-2018 NISSAN; MIL ON WITH DTC P0171, P0174, P2097, AND/OR P2099 This bulletin applies to Altima vehicles equipped with VQ35 engine only. IF YOU CONFIRM The MIL is ON with one or more of the following Air/Fuel (A/F) Sensor DTCs stored: - P0171 (Fuel Injection System Function) - P0174 (Fuel Injection System Function) - P2097 (A/F SENSOR 1) - P2099 (A/F SENSOR 1) ACTION 1. Perform th

A stored code names the test that failed, never the part that caused it. The record above is what Nissan and its owners have filed about it; the code’s page across every make has the whole file.