P0171 on Mazda vehicles The engine is running lean on bank 1: too much air, or not enough fuel, for the mixture the computer wants
P0171 is named on 48 Mazda model years (2016–2023): 66 manufacturer filings and 3 owner reports in NHTSA’s files, across CX-5, CX-3, CX-9, MX-5, Mazda3 and 3 more.
Which Mazda model years name P0171
Source: NHTSA manufacturer communications and complaintsA 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.
Mazda filings that name P0171
Source: NHTSA manufacturer communicationsBulletins and campaigns Mazda 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.
- MT-021-17 Service bulletin2017-12-05 · Engine
- Some vehicles may experience the Check Engine Light ON with DTC P0171 (Fuel Trim too Lean) and possibly DTCs P030X (Misfire). Vehicles having this concern should use the following Inspection/Repair procedure.
- MT-004-22 Service bulletin2022-12-01 · Engine And Engine Cooling
- Some vehicles may experience the Check Engine Light ON with DTC P0171 (Fuel Trim too Lean) and possibly DTCs P030X (Misfire). Vehicles having this concern should use the following Inspection/Repair procedure.
What P0171 means
Source: SAE J2012 / OBD-IIThe engine is running lean on bank 1: too much air, or not enough fuel, for the mixture the computer wants.
A stored code names the test that failed, never the part that caused it. The record above is what Mazda and its owners have filed about it; the code’s page across every make has the whole file.
Common questions
Source: NHTSA files and the OBD-II standardIs P0171 a known problem on Mazda vehicles?
It is a documented one: NHTSA's files hold 66 manufacturer filings and 3 owner reports naming P0171 on 48 Mazda model years (2016–2023). Whether it is a problem on one particular car is a diagnosis, not a count — but a bulletin that names the code on your model year is the place to start.
Which Mazda models does P0171 appear on most?
2016 CX-5 (4 documents), 2018 CX-5 (3 documents), 2018 CX-3 (2 documents).
Does P0171 on a Mazda mean it is recalled?
No. Recalls are filed by campaign and matched by VIN; no recall is triggered by a scan tool. Check the VIN at nhtsa.gov/recalls, or open the model year's page here for the campaigns filed against it.