P0171 on a 2023 Nissan Rogue

P0171 means the engine computer is adding more fuel than normal on bank 1 because it sees too much air or not enough fuel.

Not your vehicle? See general P0171 info.

Most common causes on the 2023 Nissan Rogue

Ranked from 660 NHTSA owner complaints filed for this vehicle.

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1
Failed MAF sensor
Medium severity
One owner's scan explicitly pulled P0101 (MAF circuit range/performance), the textbook cause of a lean bank-1 code from under-reported intake air.
Reported in 1 NHTSA complaint
Parts:MAF sensor
2
Throttle body / throttle position sensor fault
Low severity
A dealer found the throttle position sensor reading 6% at startup and 'sticking,' consistent with a known Nissan recall pattern; incorrect throttle-position input disrupts the PCM's fuel-air calculation.
Reported in 1 NHTSA complaint
Parts:throttle body
3
Weak fuel pump or restricted fuel delivery
Medium severity
A dealer diagnosed a fuel-system issue tied to loss of power on this vehicle (alongside a separate turbo failure), consistent with insufficient fuel delivery producing a lean trim.
Reported in 1 NHTSA complaint
Parts:fuel pump fuel filter
4
Vacuum or intake leaks
Medium severity
Cracked intake boots, PCV, or brake-booster hoses let unmetered air past the MAF, a textbook P0171 cause.
Common cause
5
Stuck-open PCV valve
Low severity
A PCV valve stuck open adds an unmetered air path into the intake, especially noticeable at idle.
Common cause
Parts:PCV valve
6
Exhaust leak upstream of the O2 sensor
Low severity
Outside air drawn past a leaking exhaust joint ahead of the front O2 sensor skews the reading lean.
Common cause
7
Intake manifold gasket leak
Medium severity
A leaking manifold gasket admits unmetered air directly downstream of the throttle body.
Common cause
Parts:intake manifold gasket

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These causes are aggregated from NHTSA owner complaints and general repair knowledge — this is not a diagnosis. P0171 on your car still needs shop confirmation before any repair.

Common symptoms

Check engine light
Rough idle
Hesitation
Surging idle
Poor fuel economy

What to check before replacing parts

Review short- and long-term fuel trims on bank 1

Look for: High positive trims (commonly worse at idle, improving with RPM) mean the computer is adding fuel to compensate for excess air or insufficient fuel — that pattern is this code's fingerprint.

Smoke-test the intake

Look for: Smoke escaping (or a hiss you can hear) at intake boots, gaskets, or vacuum hose connections confirms unmetered air is entering after the MAF sensor, which is the most common cause of a lean code.

Inspect the PCV hoses and valve

Look for: A cracked, split, or disconnected PCV hose, or a PCV valve stuck open, draws in extra unmetered air the same way a vacuum leak does.

Clean and test the MAF sensor

Look for: Visible dirt or oil film on the sensor element, or a grams/second reading that doesn't track expected airflow for RPM, means the MAF is under-reporting air and causing the computer to under-fuel.

Verify fuel pressure

Look for: Pressure below spec (weak pump, clogged filter, failing regulator) starves the engine of fuel and produces the same lean trim pattern as a vacuum leak — rule it out before chasing leaks.

Rather have a pro handle it? Find a vetted local mechanic.

Matching symptoms

Car Runs Rough