The OBD code P0172 for Honda indicates a system too rich condition in bank 1. This affects the fuel system.
Symptoms include the Check Engine Light on, increased fuel consumption.
Causes can be a faulty fuel pump, injector, or sensors.
It’s a moderate issue.
To fix, inspect and repair any damaged components, wiring, or connectors related to 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 p0172 OBD Code
The vehicle may experience a rich airfuel mixture condition indicated by Honda P0172 fault code.
- With Honda OBD code P0172, the Engine Light will be ON.
- Excessive Fuel Consumption may be noticed.
Causes of the Honda p0172 OBD Code
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Possible reasons for Honda fault code P0172 include a rich airfuel mixture due to various issues.
- P0172 in a Honda can be caused by a Faulty Fuel Pump.
- A Faulty Fuel Injector.
- A Fuel Pressure Regulator issue.
- 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 p0172 Step By Step
Addressing a rich fuel mixture condition can resolve Honda P0172 fault code.
- To fix Honda OBDII code P0172, first, review the ‘Possible Causes’ mentioned above and visually examine the corresponding wiring harness and connectors.
- Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
- Next, check the fuel pressure to ensure it is within specifications.
- Inspect the fuel injectors for clogs or leaks.
- Clean or replace the mass airflow sensor if necessary.
- Finally, reset the engine control module (ECM) and perform a fuel trim reset to clear the code and monitor for any reoccurrence.
Cost Of Fixing Honda p0172 Fault Code
Diagnosing and repairing Honda P0172 may involve inspecting fuel system components for potential issues.
The cost to diagnose and fix a Honda OBD code P0172 typically ranges from $75 to $150 per hour for labor rates.
With an estimated repair time of 1. 0 hour, the total cost can be around $75 to $150, depending on shop rates and the complexity of the issue.
Details of the Honda p0172 OBD Code
Honda P0172 indicates a rich airfuel mixture in bank 1 of the engine.
Code P0172 on a Honda means that the fuel system is running too rich on bank 1. This is triggered by the Engine Control Module (ECM) based on the oxygen sensor readings.
The ECM monitors the oxygen sensor signal to determine if the airfuel mixture is too rich (too much fuel compared to air) and sets the P0172 code when it exceeds the predetermined threshold.
Mechanic’s Tech Notes
Detailed information on Honda fault code P0172, indicating a rich fuel condition in bank 1.
To diagnose and fix OBDII code P0172 on a Honda, start by checking the fuel pressure using a fuel pressure gauge.
Low fuel pressure can cause a rich condition triggering this code.
Next, inspect the Mass Air Flow (MAF) sensor for dirt or debris that can affect its readings.
A faulty MAF sensor can lead to incorrect fuel trim levels.
Additionally, check for any vacuum leaks in the intake system as they can cause a lean condition.
Lastly, ensure the oxygen sensor is functioning correctly by monitoring its voltage output with a scan tool.
Addressing these issues can help resolve the P0172 trouble code on your Honda.
FAQ
Common causes of OBD code P0172 in a Honda: Faulty fuel pump, injector, regulator, MAF sensor, MAP sensor, A/F sensor, HO2S, vacuum leaks, throttle body or intake manifold air leaks.
Diagnose P0172 in Honda: Check fuel pump, injectors, sensors, vacuum leaks. Inspect wiring/connectors for damage. Fix faulty components.
It is not safe to continue driving with a P0172 code. Check for faulty fuel system components, sensors, and vacuum leaks. Inspect wiring and connectors for damage.
Wrap Up
If your Honda triggers OBD code P0172 and you notice poor fuel economy, rough idling, or a strong fuel smell, it may be caused by a rich airfuel mixture due to a faulty oxygen sensor, dirty fuel injectors, a clogged air filter, or a vacuum leak in the intake system.
To address Honda OBD code P0172, start by inspecting the oxygen sensor’s performance, checking for any vacuum leaks in the intake system, cleaning or replacing clogged fuel injectors, and ensuring the air filter is clean and unrestricted.
