P0171 Honda Code - Fuel Injection System Too Lean Bank 1
Quick Answer
The Powertrain Control Module (PCM) detects the oxygen content in the exhaust gas from the Air/Fuel Ratio (A/F) Sensor (Sensor 1) signal voltage, and it uses fuel feedback control to maintain the optimal air/fuel ratio. Common causes include Faulty Fuel Pump, Faulty Fuel Injector, Fuel Pressure Regulator. 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 Honda indicates Fuel Injection System Too Lean Bank 1.
- Common causes
- Common causes include Faulty Fuel Pump, Faulty Fuel Injector, Fuel Pressure Regulator.
- 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 Honda Description
What are the Possible Causes of the DTC P0171 Honda?
- Faulty Fuel Pump
- Faulty Fuel Injector
- Fuel Pressure Regulator
- Fuel line failure
- Fuel supply system failure
- Faulty Mass Air Flow (MAF) Sensor
- Faulty Manifold Absolute Pressure (MAP) Sensor
- Faulty A/F Sensor (Sensor 1)
- Faulty Secondary HO2S (Sensor 2)
- Vacuum hose mis installed
- Throttle body air leak
- Intake manifold air leak
- Faulty EVAP Canister Purge Valve
How to Fix the DTC P0171 Honda?
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
User Submitted Video
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0171 Honda 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.
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Need Help with the Code?
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Information for Specific Honda Models
- P0171 2008 Honda Accord — Fuel Injection System Too Lean Bank 1
- P0171 2009 Honda Accord — Fuel Injection System Too Lean Bank 1
- P0171 2010 Honda Accord — Fuel Injection System Too Lean Bank 1
- P0171 1996 Honda Civic — Air/Fuel Mixture System Lean Bank 1
- P0171 1997 Honda Civic — Air/Fuel Mixture System Lean Bank 1
- P0171 1998 Honda Civic — Air/Fuel Mixture System Lean Bank 1
- P0171 1999 Honda Civic — Air/Fuel Mixture System Lean Bank 1
- P0171 2000 Honda Civic — Air/Fuel Mixture System Lean Bank 1
- P0171 2016 Honda CR-V — Fuel Injection System Too Lean Bank 1
- P0171 2017 Honda CR-V — Fuel Injection System Too Lean Bank 1
- P0171 2018 Honda CR-V — Fuel Injection System Too Lean Bank 1
- P0171 2019 Honda CR-V — Fuel Injection System Too Lean Bank 1
- P0171 2020 Honda CR-V — Fuel Injection System Too Lean Bank 1
- P0171 2021 Honda CR-V — Fuel Injection System Too Lean Bank 1
Frequently Asked Questions about P0171 Honda Code
1. What are the common symptoms of OBDII code P0171 in a Honda?
- Common symptoms include rough idling, poor acceleration, engine stalling, and an illuminated check engine light.
2. What does the OBDII code P0171 in a Honda indicate?
- The code P0171 indicates that the fuel injection system is running too lean on bank 1 of the engine.
3. What are the possible causes of OBDII code P0171 in a Honda?
- Common causes include a vacuum leak, faulty oxygen sensor, dirty or clogged fuel injectors, fuel pump issues, or a malfunctioning mass airflow sensor.
4. How can I diagnose the OBDII code P0171 in my Honda?
- Diagnosing the code may involve using an OBDII scanner to read the code, checking for vacuum leaks, inspecting the oxygen sensor, and testing the fuel injectors and other relevant components.
5. Can a dirty air filter trigger the OBDII code P0171 in a Honda?
- Yes, a dirty air filter can disrupt the air-fuel mixture and contribute to the engine running too lean, potentially triggering the P0171 code.
6. What are some DIY repair tips for fixing the OBDII code P0171 in a Honda?
- DIY repair tips may include checking for and repairing vacuum leaks, replacing the oxygen sensor, cleaning or replacing clogged fuel injectors, and ensuring the air filter is clean.
7. Is it safe to continue driving my Honda with the OBDII code P0171?
- It is not recommended to continue driving the vehicle with the P0171 code as it can lead to poor engine performance, reduced fuel efficiency, and potential long-term damage to the engine.
8. Can a bad fuel pressure regulator cause the OBDII code P0171 in a Honda?
- Yes, a faulty fuel pressure regulator can disrupt the proper fuel delivery to the engine, causing it to run too lean and triggering the P0171 code.
9. How much does it typically cost to repair the OBDII code P0171 in a Honda at a professional mechanic?
- Repair costs can vary depending on the exact cause of the code, but typical repairs may range from $100 to $500, including parts and labor.
10. How often should I check for the OBDII code P0171 in my Honda to ensure optimal engine performance?
- It is recommended to check for the code regularly, especially if you notice any symptoms or changes in engine performance, and address the issue promptly to avoid further damage.
Discuss the causes and fixes for P0171 Honda OBDII Code
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Best thing to do is use sea foam on your throtle body to clean up your injectors, make sure spark plugs, cables and distributor are in good condition, and last have a mechanic check your bank 1 o2 sensor.
I did this on my 96 250k+ honda civic and runs like the day I bought it with 30k miles on it. -
Unfortunately there are many things that can trigger that code. You could start by checking for intake leaks, you can also add a fuel additive and clean the air filter, clear the code. If the code comes back you may have to replace the Oxygen sensor.
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Hi..my name jose Ruiz,,anyone can help me or give me some advice because my car Honda Civic 00 has a check engine on the code is po171 & po1457 I’m already check the intake but no leak and the other one po1457 canister purge valve sensor is works fine.
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The Oxygen sensor is the most common cause of the P0171 code, but since you have the P1457, I recommend trying to fix that problem first. The most common cause of the P1457 is the EVAP Canister Vent Solenoid.
P1457 HONDA - Evaporative Emissions Control System Leakage EVAP Canister System
Read more: https://www.autocodes.com/p... -
I’ve got a 2007 Honda Accord. Error p0171. I’ve checked the intake, no leaks. I think it could be an exhaust leak, my car doesn’t have a front O2 sensor on the air intake and I’ve noticed the wiring on the o2 sensor in the catalytic converter started hanging down insomuch that it was visible while the car wasn’t lifted. Is that my problem? I also haven’t replaced the spark plugs since I bought the car a couple years ago. Please help.
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I doubt the hanging O2 sensor wired could be the problem. The spark plugs could be the problem, but before replacing any parts, you should start by cleaning the Mass Air Flow (MAF) sensor and if possible change the air filter.
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