AutoCodes – Honda – P0172 2021 Honda CR-V

P0172 2021 Honda CR-V Code - Fuel System Too Rich 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: P0172 2021 Honda CR-V indicates Fuel System Too Rich 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 1,007

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0172 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 rich) or less, the PCM detects a malfunction in the fuel metering components and stores a Diagnostic Trouble Code (DTC).

OBDII Code P0172 2021 Honda CR-V - Fuel System Too Rich Bank 1 - AutoCodes.com — P0172 2021 Honda CR-V Code - Fuel System Too Rich Bank 1

What does this mean?

What are the Possible Causes of the DTC P0172 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 P0172 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0172 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 P0172 2021 Honda CR-V code?

Need more information on how to fix the P0172 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 P0172 2021 Honda CR-V Code

1. What does OBDII code P0172 mean on a 2021 Honda CR-V?

The code P0172 indicates that the fuel system on Bank 1 is running too rich in a 2021 Honda CR-V.

2. What are the common symptoms of OBDII code P0172 on a 2021 Honda CR-V?

Common symptoms of code P0172 include decreased fuel efficiency, rough idling, black smoke from the exhaust, and a noticeable gasoline smell.

3. What are the possible causes of OBDII code P0172 on a 2021 Honda CR-V?

Potential causes of code P0172 on a 2021 Honda CR-V include a faulty oxygen sensor, clogged fuel injectors, a vacuum leak, a malfunctioning mass airflow sensor, or issues with the fuel pressure regulator.

4. How can I diagnose the OBDII code P0172 on my 2021 Honda CR-V?

To diagnose code P0172, you can use an OBDII scanner to read the code, check for any accompanying codes, inspect the oxygen sensor, examine the fuel injectors, test the mass airflow sensor, and look for any signs of vacuum leaks.

5. Can I still drive my 2021 Honda CR-V with OBDII code P0172?

It is not recommended to drive your Honda CR-V with code P0172 for an extended period, as running a rich fuel mixture can lead to further damage to the engine and catalytic converter.

6. How can I fix OBDII code P0172 on my 2021 Honda CR-V?

Fixing code P0172 may involve replacing the oxygen sensor, cleaning or replacing fuel injectors, repairing any vacuum leaks, inspecting the mass airflow sensor, or addressing issues with the fuel pressure regulator.

7. Is it possible for a dirty air filter to trigger OBDII code P0172 on a 2021 Honda CR-V?

Yes, a dirty or clogged air filter can disrupt the air-fuel mixture ratio and potentially contribute to triggering code P0172 on a 2021 Honda CR-V.

8. How much does it typically cost to repair OBDII code P0172 on a 2021 Honda CR-V?

The cost of repairing code P0172 on a 2021 Honda CR-V can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

9. Can a bad fuel pump lead to OBDII code P0172 on a 2021 Honda CR-V?

Yes, a failing fuel pump can cause inadequate fuel delivery, resulting in a rich fuel mixture and potentially triggering code P0172 on a 2021 Honda CR-V.

10. How long does it take to repair OBDII code P0172 on a 2021 Honda CR-V?

The repair time for code P0172 on a 2021 Honda CR-V can vary based on the specific cause and necessary repairs but may take a few hours to a full day, depending on the complexity of the issue.