P0171 Infiniti Code - Fuel Injection System Too Lean Bank 1
Quick Answer
With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. Common causes include Intake air leaks, Faulty front heated oxygen sensor, Ignition misfiring. 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 Infiniti indicates Fuel Injection System Too Lean Bank 1.
- Common causes
- Common causes include Intake air leaks, Faulty front heated oxygen sensor, Ignition misfiring.
- 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.
Code P0171 Infiniti Description
In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the ECM judges the condition as the fuel injection system malfunction and light up the Malfunction Indicator Light (MIL) (2 trip detection logic).
What are the Possible Causes of the DTC P0171 Infiniti?
- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection
How to Fix the DTC P0171 Infiniti?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0171 Infiniti code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P0171 Infiniti code?
Need more information on how to fix the P0171 Infiniti code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0171 Infiniti code diagnosed by a professional: Find a repair shop in your area
Information for Specific Infiniti Models
- P0171 2003 Infiniti G35 — Fuel Injection System Too Lean Bank 1
- P0171 2004 Infiniti G35 — Fuel Injection System Too Lean Bank 1
- P0171 2005 Infiniti G35 — Fuel Injection System Too Lean Bank 1
- P0171 2006 Infiniti G35 — Fuel Injection System Too Lean Bank 1
Frequently Asked Questions about P0171 Infiniti Code
1. What are the common symptoms of OBDII code P0171 in an Infiniti?
- Common symptoms include poor fuel economy, rough idling, loss of power, and an illuminated check engine light.
2. What does the OBDII code P0171 in an Infiniti indicate?
- The code P0171 indicates that the fuel injection system on Bank 1 is running too lean, meaning there is too much air and not enough fuel in the mixture.
3. What are the possible causes of OBDII code P0171 in an Infiniti?
- Common causes include a vacuum leak, faulty oxygen sensor, clogged fuel filter, dirty mass airflow sensor, or a malfunctioning fuel injector.
4. How can I diagnose the OBDII code P0171 in my Infiniti?
- You can diagnose the code by checking for vacuum leaks, inspecting the oxygen sensor, testing the fuel pressure, cleaning the mass airflow sensor, and ensuring proper fuel injector operation.
5. Can driving with OBDII code P0171 in an Infiniti cause further damage?
- Driving with a lean fuel mixture can lead to engine misfires, overheating, and potential damage to the catalytic converter over time if left unresolved.
6. How can I repair OBDII code P0171 in my Infiniti?
- Repair options include fixing any vacuum leaks, replacing the oxygen sensor if faulty, cleaning or replacing the mass airflow sensor, and ensuring the fuel system is functioning properly.
7. Are there any DIY tips for addressing OBDII code P0171 in an Infiniti?
- DIY tips include checking for visible leaks, cleaning the mass airflow sensor with appropriate cleaner, and ensuring the air filter is clean and not restricting airflow.
8. How much does it typically cost to repair OBDII code P0171 in an Infiniti?
- The cost of repair can vary depending on the specific cause, but it may range from $100 for a simple fix like replacing an air filter to over $500 for more complex issues like replacing an oxygen sensor.
9. Is it safe to continue driving my Infiniti with OBDII code P0171?
- While the vehicle may still be driveable with this code, it is recommended to address the issue promptly to prevent potential engine damage and ensure optimal performance and fuel efficiency.
10. How long does it take to repair OBDII code P0171 in an Infiniti?
- The repair time can vary depending on the cause and extent of the issue, but most repairs can be completed within a few hours to a day by a qualified mechanic.
Discuss the causes and fixes for P0171 Infiniti OBDII Code
-
Can a exhaust leak cause the po171 code to come on. The exhaust pipe is rusty all the way down to muffler and after muffler it's rusted out
-
If there is a leak before the catalytic converter, then the leak could set the P0171 code. Check for intake leaks or clean the MAF.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
