If you own a Honda, you’ve experienced the P0171 code on your dash. The P0171 error code shows a System Too Lean (Bank 1) condition. This condition is a very common issue in many vehicle brands, including Honda, and is often linked to problems with the fuel system.
In this article, we’ll discuss what the P0171 Honda code means, its causes, symptoms and fixes, and solutions. So, let’s get started!
What Is P0171 Honda Code?
The engine code P0171 indicates that the air-fuel mixture is too lean, which means there is a small amount of air in the combustion compared to the fuel. This unevenness can affect your engine performance, lead to engine issues, and reduce fuel efficiency. The vehicles detect this code using a Powertrain Control Module (PCM).
In Honda vehicles, this fault code points to serious issues like vacuum leaks, malfunctioning sensors, fuel system issues, and more. These issues can affect the vehicle’s health; however, addressing and resolving them is crucial.
Common Causes Of The P0171 Code In Honda
Various causes can trigger the P0171 Honda code; some of the most frequent include the following:
Vacuum Leaks
The vacuum plays essential jobs in vehicles, such as controlling Exhaust Gas Recirculation (EGR) valves and amplifying brake pedal force. However, leaks in the vacuum lead to excess air entering the engine, which causes a lean mixture.
Moreover, the intake manifold gasket and throttle body are some common sources that you can check for vacuum leaks.
Malfuncated Mass Air Flow (MAF) Sensor
The MAF sensor measures the amount of air that enters the engine. If an MAF sensor is dirty or malfunctioning, it may read incorrect air intake and cause the P0171 error code on Honda.
Fuel Pump And Low Fuel Pressure Issues
The fuel pump, one of the most important fuel delivery system components, supplies fuel to the engine and ensures optimal combustion. A failed or clogged fuel pump restricts fuel flow, which could be the reason for the engine to run lean.
Low fuel pressure can also lead to a lean condition because when the fuel pressure is low, the engine does not have enough fuel, which causes the engine to run in a lean condition.
Symptoms Of P0171 Code In Honda
Many symptoms tell you that about the p0171 code. Moreover, your car will likely express one or more symptoms that are given below:
- Check Engine Light (CEL)
- Engine Stalling
- Poor Acceleration
- Increased Fuel Consumption
- Rough Idle
- Misfires
How To Fix The P0171 Code In Honda?
A proper diagnosis is a crucial procedure for fixing the P0171 engine code. You can use a well-known tool, the OBD-II scanner, to diagnose P0171 or related error codes. Once the problem is diagnosed, the following steps can help you to fix P0171 code:
Step 1. If your diagnosis reports indicate any vacuum leaks in the hoses, gasket, or throttle body, you’ll need to replace or repair any affected parts.
Step 2. If the MAF sensor is dirty, cleaning it with a proper cleaner might fix the problem. But if the sensor is found faulty, its replacement is necessary, which is a bit more costly.
Step 3. If you’ve detected a faulty O2 sensor, you can fix the lean condition by replacing it with a new one.
Step 4. Ensure the cleaning of fuel injectors because they also can cause the warning message P0171. However, cleaning or replacing the clogged fuel injectors is necessary to ensure the engine receives enough fuel.
Step 5. For example, if you find a weak or failed fuel pump, you may need to replace it to maintain proper fuel pressure.
P0171 Honda: Affected Models
No doubt, the code P0171 can appear in any Honda vehicle, but Honda has some specific models that are reported with this error. However, it is more commonly seen in:
- Honda Civic
- Honda Accord
- Honda CRV
- Honda Pilot
- Honda Odyssey
Required Tools For Fixing P0171 Code On Honda
Maintenance from a certified mechanic can be more costly than doing it alone. So, if you’re a DIYer planning to fix the P0171 code yourself, you will need the following important tools:
- OBD-II Scanner
- MAF Sensor Cleaner
- Vacuum Gauge
- Fuel Pressure Gauge
- Socket Set and Wrenches
- Multimeter (for sensor testing)
But if you need to become more familiar with auto parts, tools, and repairs, then it is always recommended that a professional fix those issues. This will give you peace of mind and risk-free service.
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In A Nutshell
Error codes in vehicles, especially those related to the engine, can affect the vehicle’s optimal performance and longevity. So, by understanding the engine error code P0171 Honda, its importance, causes, and fixes, you can prevent your vehicles from potential issues such as rough idling, poor acceleration, and engine stalling.
Experts have advised you to get maintenance for your Honda regularly because this will ensure the vehicle is safe from potential issues.