What does code P0171 mean on a Nissan and is it safe to drive?
P0171: System Too Lean (Bank 1). Here's what it means on your Nissan, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
What this code means
The engine is getting too much air relative to fuel. The O2 sensor sees excess oxygen in the exhaust and the PCM is adding more fuel than normal to compensate.
Common causes for your Nissan
- Dirty or faulty mass airflow (MAF) sensor
- Vacuum leaks (PCV hose, intake gasket, brake booster)
- Weak fuel pump or clogged fuel filter
- Leaking or stuck open fuel injectors (less common)
Symptoms
- Check Engine Light
- Rough idle, hesitation, lack of power
- Possible spark knock under load
- Poor fuel economy
Typical fixes
- Clean or replace MAF sensor
- Locate and seal vacuum leaks
- Replace fuel filter / test fuel pressure
- Smoke test intake system
Repair cost range
For a Nissan, repairs for P0171 often fall between $50 and $500, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on Nissan
Nissan P0171 on QR25DE 2.5L engines is very commonly caused by the EVAP purge valve (canister purge solenoid) sticking open—when stuck open, it draws in a large unmetered air stream that leans out the mixture. Test the purge valve by unplugging it; if the lean condition temporarily improves, replace the valve. On VQ35DE 3.5L engines (Maxima, Murano, Pathfinder), the intake manifold collector gasket cracks at the rear cylinder bank by 90k–110k miles—requires intake removal to access and replace.
Most commonly affected models