P0171 on a 2015 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 2015 Nissan Rogue

Ranked from 546 NHTSA owner complaints filed for this vehicle.

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1
Vacuum Leak (Intake Manifold/Gaskets)
Medium severity
Unmetered air enters the engine, causing a lean condition. The intake manifold on this vehicle is made of plastic and prone to failure/cracking.
Reported in 1 NHTSA complaint
2
Faulty Oxygen (O2) Sensor
Low severity
A failing upstream O2 sensor can falsely report a lean condition or fail to properly monitor the air/fuel ratio.
Reported in 1 NHTSA complaint
3
Faulty Mass Air Flow (MAF) Sensor
Medium severity
A dirty or failing MAF sensor incorrectly measures incoming air, leading the ECM to provide insufficient fuel. This is a standard cause for P0171.
Common cause
4
Low Fuel Pressure (Failing Fuel Pump or Clogged Filter)
Medium severity
If the engine does not receive enough fuel pressure, it will run lean. This is a common generic cause for a P0171 code.
Common cause
5
Exhaust Leak (Before Upstream O2 Sensor)
Medium severity
An exhaust leak allows outside air to reach the oxygen sensor, tricking it into reading a lean condition.
Common cause
6
Clogged or Faulty Fuel Injectors
Medium severity
Restricted fuel injectors will not spray enough fuel into the cylinders, resulting in a lean mixture.
Common cause

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