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Home›Trouble codes›P0171› Acura
Diagnostic trouble code · Acura

P0171 on Acura 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 20 Acura model years (2016–2020): 240 manufacturer filings and 0 owner reports in NHTSA’s files, across MDX, TLX, RDX, RLX.

Powertrain 20 model years 240 manufacturer filings

Which Acura model years name P0171

Source: NHTSA manufacturer communications and complaints
Model yearFiled underBulletinsOwner reports
2020 Acura MDXFuel/Propulsion System16—
2020 Acura TLXFuel/Propulsion System16—
2019 Acura MDXFuel/Propulsion System16—
2019 Acura TLXFuel/Propulsion System16—
2018 Acura MDXFuel/Propulsion System16—
2018 Acura TLXFuel/Propulsion System16—
2017 Acura MDXFuel/Propulsion System16—
2017 Acura TLXFuel/Propulsion System16—
2016 Acura MDXFuel/Propulsion System16—
2016 Acura TLXFuel/Propulsion System16—
2020 Acura RDXFuel/Propulsion System15—
2019 Acura RDXFuel/Propulsion System15—
2018 Acura RDXFuel/Propulsion System15—
2017 Acura RDXFuel/Propulsion System15—
2016 Acura RDXFuel/Propulsion System15—
2020 Acura RLXEngine1—
2019 Acura RLXEngine1—
2018 Acura RLXFuel/Propulsion System1—
2017 Acura RLXFuel/Propulsion System1—
2016 Acura RLXFuel/Propulsion System1—

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.

Fuel/Propulsion System 153 Electrical System 44 Engine 43
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Acura filings that name P0171

Source: NHTSA manufacturer communications

Bulletins and campaigns Acura 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.

What P0171 means

Source: SAE J2012 / OBD-II

The 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 Acura and its owners have filed about it; the code’s page across every make has the whole file.

From here
Get a model's new bulletins by email See what owners reported Look up a bulletin by its number Watch a VIN for new recalls

Common questions

Source: NHTSA files and the OBD-II standard

Is P0171 a known problem on Acura vehicles?

It is a documented one: NHTSA's files hold 240 manufacturer filings and 0 owner reports naming P0171 on 20 Acura model years (2016–2020). 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 Acura models does P0171 appear on most?

2020 MDX (16 documents), 2019 MDX (16 documents), 2018 MDX (16 documents).

Does P0171 on a Acura 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.

Where to go next

pages beside this code
Filed alongside P0174 Another code that appears in the same filings and owner reports as P0171.Filed alongside P0455 Another code that appears in the same filings and owner reports as P0171.Vehicle 2020 Acura MDX The model year P0171 is filed against most often.The data Trouble codes by API GET /v1/dtc joins every code to bulletins and owner reports — free tier, no card.