The OBD code P0171 for Honda indicates a lean fuel mixture in bank 1. It affects the fuel system.
Symptoms include the Check Engine Light on and increased fuel consumption.
Causes can be a faulty fuel pump, injector, or sensors.
It’s a moderate issue that can affect engine performance.
A possible fix is to inspect and repair any damaged components in the fuel system and sensors.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 10.0 (Out of 10) |
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Symptoms of the Honda p0171 OBD Code
The vehicle may experience a lean airfuel mixture condition indicated by fault code P0171.
- With Honda OBD code P0171, the Engine Light will be ON.
- Excessive Fuel Consumption may be noticed.
Causes of the Honda p0171 OBD Code
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Possible reasons for Honda P0171 include vacuum leaks, faulty MAF sensor, or fuel delivery issues.
- P0171 in a Honda can be caused by a Faulty Fuel Pump.
- A Faulty Fuel Injector.
- Fuel Pressure Regulator malfunction.
- Fuel line failure.
- Fuel supply system failure.
- A Faulty Mass Air Flow (MAF) Sensor.
- A Faulty Manifold Absolute Pressure (MAP) Sensor.
- A Faulty A/F Sensor (Sensor 1).
- A Faulty Secondary HO2S (Sensor 2).
- Vacuum hose misinstalled.
- Throttle body air leak.
- Intake manifold air leak.
- Or a Faulty EVAP Canister Purge Valve.
Fixing Honda Error Code p0171 Step By Step
Addressing a lean condition in the fuel system can resolve Honda P0171 fault code.
- To fix Honda OBDII code P0171, first, review the possible causes related to a lean fuel condition.
- Visually inspect the air intake system for any leaks or loose connections.
- Check the fuel pressure to ensure it meets specifications.
- Clean the mass airflow sensor using appropriate cleaner.
- Replace the upstream oxygen sensor if it’s old or faulty.
- Reset the vehicle’s ECM to clear the trouble code.
- If the issue persists, consider seeking assistance from a professional technician for further diagnosis.
Cost Of Fixing Honda p0171 Fault Code
Diagnosing and repairing Honda P0171 typically involves inspecting for vacuum leaks and cleaning the MAF sensor.
The cost to diagnose and fix a Honda 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.
Details of the Honda p0171 OBD Code
Honda P0171 indicates a lean airfuel mixture in bank 1 of the engine.
Code P0171 on a Honda means that the engine control module (ECM) has detected a lean condition on bank 1. This indicates that there is too much air and not enough fuel in the airfuel mixture.
The component that triggers this code is usually a vacuum leak in the intake system or a faulty mass airflow sensor (MAF).
The ECM monitors the airfuel ratio using the MAF sensor and oxygen sensors to determine if the mixture is too lean.
Mechanic’s Tech Notes
Detailed information on diagnosing and fixing Honda fault code P0171 for a lean fuel condition.
To diagnose and fix OBDII code P0171 on a Honda, start by checking for vacuum leaks in the intake system, especially around the intake manifold gasket.
Use a smoke machine or propane torch carefully to pinpoint leaks.
Inspect the Mass Air Flow (MAF) sensor for dirt or contamination.
Test the sensor’s output with a scan tool or multimeter.
Check for a clogged fuel filter or weak fuel pump pressure.
Verify proper fuel pressure using a gauge.
Lastly, ensure there are no exhaust leaks before the oxygen sensor.
Addressing these issues should help resolve the lean condition indicated by the P0171 trouble code.
FAQ
Common causes of OBD code P0171 in a Honda: Faulty fuel pump, injector, MAF sensor, vacuum hose misinstalled, intake manifold air leak. Inspect wiring and connectors for damage.
Diagnose P0171 in Honda: Check fuel pump, injectors, sensors, vacuum leaks. Inspect wiring, connectors for damage. Fix faulty components, repair wiring/connectors as needed.
It is not safe to continue driving with a P0171 code in your Honda. Check for faulty fuel pump, injectors, sensors, and inspect wiring for damage.
Wrap Up
If your Honda 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, clogged fuel injectors, or a dirty air filter.
To address Honda OBD code P0171, start by inspecting the air intake system for leaks, checking the oxygen sensor’s readings, cleaning or replacing clogged fuel injectors, and ensuring the air filter is clean.
Consider testing the fuel pressure and looking for any unmetered air entering the engine.
