P0171 on a 2017 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 2017 Nissan Rogue

Ranked from 591 NHTSA owner complaints filed for this vehicle.

Sort by:

1
Vacuum Leak (Intake Manifold/Gasket)
Medium severity
A vacuum leak introduces unmetered air into the engine, causing a lean condition. Look for cracked hoses or a failed intake manifold gasket, which can cause stalling or hesitation.
Reported in 1 NHTSA complaint
2
Faulty Air-Fuel Ratio (A/F) Sensor or O2 Sensor
Low severity
The A/F or O2 sensor monitors the oxygen level in the exhaust. If it fails or reads incorrectly, it can falsely trigger a lean code (P0171).
Reported in 1 NHTSA complaint
3
Exhaust Manifold Leak
Medium severity
An exhaust leak upstream of the O2 sensor can pull in outside air, tricking the sensor into reading a lean condition. Look for cracks in the exhaust manifold.
Reported in 1 NHTSA complaint
4
Faulty Engine Control Module (ECM)
High severity
A failing ECM may incorrectly process sensor data or fail to command the correct fuel trim, leading to drivability issues and lean codes.
Reported in 1 NHTSA complaint
5
Mass Air Flow (MAF) Sensor Failure or Dirty
Medium severity
A dirty or failing MAF sensor underestimates the amount of air entering the engine, causing the ECM to inject less fuel, resulting in a lean condition.
Common cause
6
Low Fuel Pressure (Failing Fuel Pump or Clogged Filter)
High severity
If the fuel pump is weak or the filter is clogged, the engine won't receive enough fuel to match the incoming air, triggering a P0171 code.
Common cause
7
Clogged or Faulty Fuel Injectors
Medium severity
Restricted fuel injectors will not spray the commanded amount of fuel, leading to a lean mixture in one or more cylinders.
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