AutoCodes – Honda – P0171 2021 Honda CR-V

P0171 2021 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 2021 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 310

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 2021 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 2021 Honda CR-V - Fuel Injection System Too Lean Bank 1 - AutoCodes.com — P0171 2021 Honda CR-V Code - Fuel Injection System Too Lean Bank 1

What does this mean?

What are the Possible Causes of the DTC P0171 2021 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 2021 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 2021 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 2021 Honda CR-V code?

Need more information on how to fix the P0171 2021 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 2021 Honda CR-V Code

1. What are the common symptoms of OBDII code P0171 (Fuel Injection System Too Lean Bank 1) on a 2021 Honda CR-V?

- Common symptoms include rough idling, engine hesitation, loss of power, and an illuminated check engine light.

2. What are the possible causes of OBDII code P0171 on a 2021 Honda CR-V?

- Common causes of this code may include a vacuum leak, faulty oxygen sensor, clogged fuel filter, malfunctioning mass airflow sensor, or a dirty fuel injector.

3. How can I diagnose the root cause of OBDII code P0171 on my 2021 Honda CR-V?

- Use an OBDII scanner to read the code and check for any other related codes. Inspect for vacuum leaks, test the oxygen sensor, clean or replace the mass airflow sensor, and check the fuel pressure.

4. Can a dirty air filter trigger OBDII code P0171 on a 2021 Honda CR-V?

- Yes, a dirty air filter can disrupt the air-fuel mixture ratio, leading to a lean condition and triggering code P0171.

5. How can I fix OBDII code P0171 on my 2021 Honda CR-V?

- Possible solutions include repairing any vacuum leaks, replacing the oxygen sensor, cleaning or replacing the mass airflow sensor, checking the fuel pressure and injectors, and ensuring the air filter is clean.

6. Is it safe to continue driving my 2021 Honda CR-V with OBDII code P0171?

- It is not recommended to drive for an extended period with this code as it can lead to poor engine performance and potential long-term damage if left unresolved.

7. Can a bad fuel pump cause OBDII code P0171 on a 2021 Honda CR-V?

- Yes, a failing fuel pump may result in insufficient fuel delivery, causing a lean condition and triggering code P0171.

8. How much does it typically cost to repair OBDII code P0171 on a 2021 Honda CR-V?

- The cost of repair can vary depending on the root cause. It can range from a simple fix like replacing an air filter to more complex repairs involving sensors or fuel system components.

9. Will resetting the check engine light resolve OBDII code P0171 on a 2021 Honda CR-V?

- Resetting the check engine light may temporarily turn it off, but if the underlying issue causing the code is not addressed, the light is likely to come back on.

10. Can extreme weather conditions affect the occurrence of OBDII code P0171 on a 2021 Honda CR-V?

- Yes, extreme temperatures or humidity can impact the performance of sensors and the air-fuel mixture, potentially leading to a lean condition and triggering code P0171.