P0171 Nissan Code - Fuel Injection System Too Lean Bank 1
Quick Answer
The P0171 code for Nissan vehicles indicates that the fuel injection system on Bank 1 is too lean. Common causes include Faulty oxygen sensor, Vacuum leaks in the intake system, Clogged fuel injectors. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0171 Nissan indicates Fuel Injection System Too Lean Bank 1.
- Common causes
- Common causes include Faulty oxygen sensor, Vacuum leaks in the intake system, Clogged fuel injectors.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P0171 Nissan Description
The P0171 code for Nissan vehicles indicates that the fuel injection system on Bank 1 is too lean. This means that there is an imbalance in the air-fuel mixture, with too much air and not enough fuel being delivered to the engine. This can lead to a variety of issues, including reduced power, poor fuel efficiency, rough idling, and potential damage to the engine over time.
Common Causes of P0171 Nissan
- Faulty oxygen sensor
- Vacuum leaks in the intake system
- Clogged fuel injectors
- Malfunctioning fuel pressure regulator
- Dirty or clogged air filter
Symptoms of P0171 Nissan
- Reduced engine power
- Poor fuel efficiency
- Rough idling or stalling
- Check Engine Light illuminated
- Hesitation or misfires
How to Fix P0171 Nissan
- Diagnose the specific cause of the lean condition using a scan tool and checking for vacuum leaks.
- Replace the faulty oxygen sensor if necessary.
- Clean or replace clogged fuel injectors.
- Check and replace the air filter if dirty.
- Test the fuel pressure regulator and replace if needed.
Cost to Fix P0171 Nissan
The cost of repairing a P0171 code on a Nissan vehicle can vary depending on the specific cause of the issue. Typically, replacing an oxygen sensor can cost between $200 to $300, cleaning or replacing fuel injectors can range from $50 to $150 per injector, and diagnosing and fixing vacuum leaks can be around $100 to $200. Overall, the total repair cost could range from $300 to $800, including parts and labor. It's important to note that labor rates at auto repair shops can vary, so it's recommended to get quotes from multiple shops to find the best deal.
Tech Notes for P0171 Nissan
There are factory service bulletins for the following Nissan models:
2004 Maxima (A34) with 5 speed A/T only
2004 Quest (V42) with 5 speed A/T only
2004 Nissan Maxima, Quest Factory Service Bulletin OBDII Code P0171
2004 Maxima (A34) with 4-speed A/T and 6-speed M/T
2004 Quest (V42) with 4-speed A/T
2004 Nissan Maxima, Quest Factory Service Bulletin OBDII Code P0171
User Submitted Video
Need more information about the P0171 Nissan code?
Need more information on how to fix the P0171 Nissan code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0171 Nissan code diagnosed by a professional: Find a repair shop in your area
Information for Specific Nissan Models
- P0171 2002 Nissan Altima_sedan — Fuel Injection System Too Lean Bank 1
- P0171 2003 Nissan Altima_sedan — Fuel Injection System Too Lean Bank 1
- P0171 2004 Nissan Altima_sedan — Fuel Injection System Too Lean Bank 1
- P0171 2005 Nissan Altima_sedan — Fuel Injection System Too Lean Bank 1
- P0171 2006 Nissan Altima_sedan — Fuel Injection System Too Lean Bank 1
- P0171 2008 Nissan Altima_sedan — Fuel Injection System Too Lean Bank 1
- P0171 2009 Nissan Altima_sedan — Fuel Injection System Too Lean Bank 1
- P0171 2010 Nissan Altima_sedan — Fuel Injection System Too Lean Bank 1
- P0171 2011 Nissan Altima_sedan — Fuel Injection System Too Lean Bank 1
- P0171 2012 Nissan Altima_sedan — Fuel Injection System Too Lean Bank 1
- P0171 2004 Nissan Maxima — Fuel Injection System Too Lean Bank 1
- P0171 2005 Nissan Maxima — Fuel Injection System Too Lean Bank 1
- P0171 2006 Nissan Maxima — Fuel Injection System Too Lean Bank 1
- P0171 2007 Nissan Maxima — Fuel Injection System Too Lean Bank 1
- P0171 2008 Nissan Maxima — Fuel Injection System Too Lean Bank 1
- P0171 2005 Nissan Pathfinder — Fuel Injection System Too Lean Bank 1
- P0171 2006 Nissan Pathfinder — Fuel Injection System Too Lean Bank 1
- P0171 2007 Nissan Pathfinder — Fuel Injection System Too Lean Bank 1
- P0171 2008 Nissan Pathfinder — Fuel Injection System Too Lean Bank 1
- P0171 2009 Nissan Pathfinder — Fuel Injection System Too Lean Bank 1
- P0171 2010 Nissan Pathfinder — Fuel Injection System Too Lean Bank 1
- P0171 2011 Nissan Pathfinder — Fuel Injection System Too Lean Bank 1
- P0171 2012 Nissan Pathfinder — Fuel Injection System Too Lean Bank 1
- P0171 2008 Nissan Rogue — Fuel Injection System Too Lean Bank 1
- P0171 2009 Nissan Rogue — Fuel Injection System Too Lean Bank 1
- P0171 2010 Nissan Rogue — Fuel Injection System Too Lean Bank 1
- P0171 2011 Nissan Rogue — Fuel Injection System Too Lean Bank 1
- P0171 2012 Nissan Rogue — Fuel Injection System Too Lean Bank 1
- P0171 2013 Nissan Rogue — Fuel Injection System Too Lean Bank 1
- P0171 2002 Nissan Sentra — Fuel Injection System Too Lean Bank 1
- P0171 2003 Nissan Sentra — Fuel Injection System Too Lean Bank 1
- P0171 2004 Nissan Sentra — Fuel Injection System Too Lean Bank 1
- P0171 2005 Nissan Sentra — Fuel Injection System Too Lean Bank 1
- P0171 2006 Nissan Sentra — Fuel Injection System Too Lean Bank 1
- P0171 2007 Nissan Sentra — Fuel Injection System Too Lean Bank 1
- P0171 2008 Nissan Sentra — Fuel Injection System Too Lean Bank 1
- P0171 2009 Nissan Sentra — Fuel Injection System Too Lean Bank 1
- P0171 2010 Nissan Sentra — Fuel Injection System Too Lean Bank 1
- P0171 2011 Nissan Sentra — Fuel Injection System Too Lean Bank 1
- P0171 2012 Nissan Sentra — Fuel Injection System Too Lean Bank 1
Frequently Asked Questions about P0171 Nissan Code
1. What are the common symptoms of OBDII code P0171 on a Nissan?
Symptoms may include rough idling, reduced fuel efficiency, hesitation or stalling during acceleration, and the illumination of the check engine light.
2. What does the OBDII code P0171 "Fuel Injection System Too Lean Bank 1" indicate on a Nissan?
This code indicates that the engine is receiving too much air and not enough fuel, leading to a lean air-fuel mixture in bank 1 of the engine.
3. What are some common causes of OBDII code P0171 on a Nissan?
Common causes include a vacuum leak, faulty mass airflow sensor (MAF), clogged fuel filter, fuel pump issues, oxygen sensor malfunction, or a dirty or clogged fuel injector.
4. How can I diagnose the cause of OBDII code P0171 on my Nissan?
You can diagnose the issue by performing a visual inspection for leaks, checking the MAF sensor, inspecting the air intake system, testing the fuel pressure, examining the oxygen sensor, and conducting a fuel injector cleaning.
5. Can driving with OBDII code P0171 on a Nissan cause further damage?
Continuing to drive with a lean air-fuel mixture can potentially damage the engine over time, leading to issues such as overheating, misfires, and reduced engine performance.
6. Is it safe to ignore OBDII code P0171 on my Nissan?
It is not recommended to ignore this code, as it can lead to decreased fuel efficiency, engine performance issues, and potential long-term damage if left unresolved.
7. How can I repair OBDII code P0171 on my Nissan?
Repair options include fixing vacuum leaks, replacing the MAF sensor, cleaning or replacing the fuel filter, addressing fuel pump issues, replacing the oxygen sensor, or cleaning or replacing clogged fuel injectors.
8. Will resetting the OBDII code P0171 on my Nissan make it go away permanently?
Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing the lean condition is not addressed, the code is likely to reappear.
9. Can a DIY enthusiast fix OBDII code P0171 on a Nissan, or should it be done by a professional mechanic?
Depending on your mechanical skills and access to tools, some repairs for code P0171 can be done by a DIY enthusiast. However, complex diagnoses and repairs may require the expertise of a professional mechanic.
10. How much can I expect to pay to repair OBDII code P0171 on my Nissan?
Costs for repairing this code can vary depending on the specific cause and the parts or components that need to be replaced. It's advisable to get a diagnostic from a mechanic to determine the exact repair cost.
Discuss the causes and fixes for P0171 Nissan OBDII Code
-
Hi, my pathfinder 2003 gives me the P0171 code and he consume 25 liter/100 km (City) but yesterday I erase the code before doing 800 km on the higway and I got the best consumtion ever (12 l / 100 km). As soon as I arrive in the city, the check engine came back.
any guess what it could be??thanks
-
Start with simple stuff. Clean the Mass Air Flow (MAF) sensor, replace the air filter and use high octane gas for a couple of weeks. If the problem persist, then the next step is to check for intake leaks or possible a new MAF.
-
Yes. Air intake leaks could cause unmeter air into the engine and cause a lean combustion.
-
Check egr vacuum regulator I’ve got 1996 Nissan pick up with 2.4 code p0171 drive me crazy found leaky vacuum diaprham that controls egr valve I unhooked brake booster vac line and blew cigar smoke back to throttle body and found vacuum leak with smoke the vacume lines go from egr to vacuum regulator also block off top of throttle body or you waste time testing this way you will lose your smoke out off throttle body . Good luck
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.