AutoCodes – Honda – P0171 2018 Honda CR-V

P0171 2018 Honda CR-V 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 2018 Honda CR-V 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.

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Code Popularity 451

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 14, 2023

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0171 2018 Honda CR-V Description

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. The air/fuel ratio coefficient for correcting the amount of injected fuel is the short-term fuel trim. The PCM varies short-term fuel trim continuously to keep the air/fuel ratio close to the stoichiometric ratio for all driving conditions. Long-term fuel trim is computed from short-term fuel trim and is used to regulate long-term deviation from the stoichiometric air/fuel ratio, which occurs when fuel metering components deteriorate with age or system failures occur. In addition, long-term fuel trim is stored in the PCM memory and is used to determine when fuel metering components malfunction. When long-term fuel trim is higher than normal, which is about 1 (0 %), the amount of injected fuel must be increased, and when lower than normal, it must be decreased. If long-term fuel trim is normal (too lean) or more, the PCM detects a malfunction in the fuel metering components and stores a Diagnostic Trouble Code (DTC).

OBDII Code P0171 2018 Honda CR-V - Fuel Injection System Too Lean Bank 1 - AutoCodes.com — P0171 2018 Honda CR-V Code - Fuel Injection System Too Lean Bank 1

What does this mean?

What are the Possible Causes of the DTC P0171 2018 Honda CR-V?

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 2018 Honda CR-V?

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.

What does this mean?

Code Tech Notes

If the P0171 is combined with the P0174 code, it's highly likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the Mass Air Flow (MAF) Sensor. If the problem persists, the A/F Sensor (Sensor 1) may need to be replaced.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0171 2018 Honda CR-V 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 2018 Honda CR-V code?

Need more information on how to fix the P0171 2018 Honda CR-V code? Get Access to Factory Service Manuals

Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0171 2018 Honda CR-V Code

1. What does OBDII code P0171 mean for a 2018 Honda CR-V?

The P0171 code on a 2018 Honda CR-V indicates a "Fuel Injection System Too Lean Bank 1" issue, meaning that there is an imbalance in the air-fuel mixture in the engine's cylinders.

2. What are common symptoms of OBDII code P0171 in a 2018 Honda CR-V?

Common symptoms of P0171 in a 2018 Honda CR-V include rough idling, poor acceleration, decreased fuel efficiency, and in some cases, the Check Engine light may illuminate.

3. What are potential causes of OBDII code P0171 on a 2018 Honda CR-V?

Possible causes of P0171 in a 2018 Honda CR-V include a vacuum leak, faulty oxygen sensor, dirty or clogged fuel injectors, a malfunctioning mass airflow sensor, or a problem with the fuel pressure regulator.

4. How can I diagnose the OBDII code P0171 in my 2018 Honda CR-V?

To diagnose P0171, you can use an OBDII scanner to read the code and then inspect the intake system, vacuum hoses, oxygen sensor, fuel injectors, and other components related to the fuel injection system for any issues.

5. Can a dirty air filter trigger the OBDII code P0171 on a 2018 Honda CR-V?

Yes, a dirty air filter can disrupt the air-fuel mixture, leading to a lean condition and triggering the P0171 code in a 2018 Honda CR-V. Regular air filter maintenance is essential for optimal engine performance.

6. How can I repair OBDII code P0171 on my 2018 Honda CR-V?

Repairing P0171 on a 2018 Honda CR-V may involve fixing any vacuum leaks, replacing a faulty oxygen sensor, cleaning or replacing clogged fuel injectors, ensuring proper fuel pressure, or addressing issues with the mass airflow sensor.

7. Is it safe to continue driving my 2018 Honda CR-V with OBDII code P0171?

It is not recommended to drive your 2018 Honda CR-V with the P0171 code unresolved, as a lean fuel mixture can lead to engine damage over time. It's best to address the issue promptly to prevent further complications.

8. Can a bad fuel pump cause the OBDII code P0171 on a 2018 Honda CR-V?

Yes, a failing fuel pump can disrupt the fuel delivery system, leading to a lean condition and triggering the P0171 code in a 2018 Honda CR-V. Checking the fuel pump's functionality is advisable when diagnosing this code.

9. Will resetting the Check Engine light fix OBDII code P0171 on a 2018 Honda CR-V?

Simply resetting the Check Engine light will not resolve the underlying issue causing the P0171 code on a 2018 Honda CR-V. It's crucial to diagnose and address the root cause of the problem to prevent further issues.

10. How can I prevent OBDII code P0171 from recurring on my 2018 Honda CR-V?

To prevent the recurrence of the P0171 code on your 2018 Honda CR-V, perform regular maintenance, such as replacing air filters, cleaning fuel injectors, checking for vacuum leaks, and ensuring all engine components are functioning correctly. Regular inspections can help maintain a healthy fuel injection system.