The OBD code P0171 for Nissan indicates a system too lean condition in bank 1. This affects the fuel system.
Symptoms include the Check Engine light on, increased fuel consumption.
Causes may include intake air leaks, faulty oxygen sensor, ignition misfiring.
It’s a moderate issue that can affect engine performance.
A possible fix is to inspect and repair any intake air leaks, check the oxygen sensor, and ensure proper fuel pressure.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 10.0 (Out of 10) |
Symptoms of the Nissan p0171 OBD Code
Vehicle experiencing lean condition indicated by Nissan P0171 fault code.
- Symptoms: Engine Light ON (or Service Engine Soon Warning Light).
- Excessive Fuel Consumption.
- Rough idle.
- Hesitation or lack of power during acceleration.
Causes of the Nissan p0171 OBD Code
Do you know you can clear most fault codes—but some could mean serious danger? Don’t take chances with your safety or your family’s safety. This budget-friendly car scanner makes it easy to clear fault codes in seconds while showing you exactly what’s wrong. Plug it in, connect to your Android or iOS phone, and instantly check live data. You’ll know if it’s a minor issue you can clear or something serious that needs attention—so you can drive safely and stress-free. (Today’s Deal)
P0171 in Nissan indicates a lean condition in bank 1 of the engine.
- P0171 can be caused by intake air leaks.
- A faulty front heated oxygen sensor.
- Ignition misfiring.
- Faulty fuel injectors.
- Exhaust gas leaks.
- Incorrect fuel pressure.
- Lack of fuel.
- A faulty Mass Air Flow (MAF) sensor.
- Or an incorrect Positive Crankcase Ventilation (PCV) hose connection.
Fixing Nissan Error Code p0171 Step By Step
Addressing a lean condition in the fuel system can resolve Nissan P0171 fault code.
- To fix the Nissan OBDII code P0171, start by reviewing the possible causes mentioned above.
- Visually examine the corresponding wiring harness and connectors for any damage.
- Inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
- Check for any vacuum leaks in the intake system.
- Clean or replace the Mass Air Flow (MAF) sensor if necessary.
- Inspect the fuel injectors for clogs or leaks.
- Test the fuel pressure to ensure it meets specifications.
- Reset the Engine Control Module (ECM) to clear the code and see if it returns.
- If the code persists, consider replacing the oxygen (O2) sensor.
Cost Of Fixing Nissan p0171 Fault Code
Diagnosing and repairing Nissan P0171 typically involves inspecting for vacuum leaks and faulty oxygen sensors.
The cost to diagnose and fix a Nissan OBD code P0171 typically ranges from $75 to $150 per hour for labor rates.
With an estimated repair time of 1. 0 hour, the total cost could be around $75 to $150, depending on shop rates and the complexity of the issue.
That fault code is a turning point. If repair costs are climbing and your current loan feels like it’s holding you back, this is the time to plan ahead. The free Car Loan Payment Tracker helps you see how quickly you can pay off what’s left—and start preparing, with confidence, for your dream car.
Details of the Nissan p0171 OBD Code
Nissan P0171 indicates a lean fuel mixture in bank 1 of the engine.
Code P0171 for Nissan vehicles indicates a system too lean condition in bank 1. This means that the Engine Control Module (ECM) has detected that the airfuel mixture is too lean or there is too much air and not enough fuel being delivered to the engine in bank 1. This can be caused by issues such as a vacuum leak, a faulty mass airflow sensor, a clogged fuel filter, a malfunctioning fuel pump, or a problem with the oxygen sensor.
The ECM triggers this code based on the feedback it receives from the oxygen sensor indicating a lean condition in bank 1 of the engine.
Mechanic’s Tech Notes
Detailed information on diagnosing and fixing Nissan code P0171, indicating a lean fuel condition in bank 1.
To diagnose and fix OBDII code P0171 on a Nissan, start by checking for vacuum leaks in the intake system.
Use a smoke machine or propane torch carefully around intake components while monitoring fuel trims with a scan tool.
Inspect the Mass Air Flow (MAF) sensor for dirt or contamination.
Test the sensor’s output voltage with a multimeter.
Clean or replace the MAF sensor if necessary.
Verify fuel pressure meets specifications using a gauge.
Check for clogged fuel injectors or a faulty fuel pressure regulator.
Address any issues found to resolve the lean condition causing the P0171 code.
FAQ
Common causes of OBD code P0171 in a Nissan: intake air leaks, faulty front heated oxygen sensor, ignition misfiring, faulty fuel injectors, faulty MAF sensor.
Diagnose P0171 in Nissan: Check for intake air leaks, faulty oxygen sensor, misfires, faulty injectors, exhaust leaks, fuel pressure, MAF sensor, PCV hose. Inspect wiring/connectors for damage.
It is not safe to continue driving with a P0171 code in a Nissan. Address intake air leaks, faulty sensors, misfires, or fuel system issues promptly.
Wrap Up
If your Nissan triggers OBD code P0171 and you notice poor fuel economy, rough idling, or a lack of power, it may be caused by a vacuum leak, faulty oxygen sensor, dirty mass airflow sensor, or a clogged fuel filter.
To address Nissan OBD code P0171, start by inspecting the air intake system for leaks, testing the oxygen sensor’s performance, cleaning the mass airflow sensor, and replacing the fuel filter if necessary.
Check for any damaged wiring or loose connections in these components.
