AutoCodes – Honda – P0172 2018 Honda CR-V

P0172 2018 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 2018 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 956

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
Cost to Diagnose
FAQs
Comments
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Code P0172 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 rich) or less, the PCM detects a malfunction in the fuel metering components and stores a Diagnostic Trouble Code (DTC).

OBDII Code P0172 2018 Honda CR-V - Fuel System Too Rich Bank 1 - AutoCodes.com — P0172 2018 Honda CR-V Code - Fuel System Too Rich Bank 1

What does this mean?

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

Labor: 1.0

To diagnose the P0172 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 P0172 2018 Honda CR-V code?

Need more information on how to fix the P0172 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 P0172 2018 Honda CR-V Code

1. What does the OBDII code P0172 on a 2018 Honda CR-V indicate?

- The code P0172 points to a "Fuel System Too Rich Bank 1" condition in the engine of the 2018 Honda CR-V.

2. What are common symptoms of the P0172 code in a 2018 Honda CR-V?

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

3. What are the possible causes of the P0172 code in a 2018 Honda CR-V?

- Common causes of the P0172 code in a 2018 Honda CR-V include a faulty oxygen sensor, a clogged fuel injector, a vacuum leak, or a malfunctioning fuel pressure regulator.

4. How can I diagnose the P0172 code in my 2018 Honda CR-V?

- Diagnosing the P0172 code involves checking the oxygen sensor readings, inspecting for vacuum leaks, testing the fuel pressure, and examining the fuel injectors for clogs.

5. Can a dirty air filter trigger the P0172 code in a 2018 Honda CR-V?

- Yes, a dirty air filter can disrupt the air-fuel mixture ratio, potentially leading to a rich condition and triggering the P0172 code.

6. How can I repair the P0172 code in my 2018 Honda CR-V?

- Repairing the P0172 code may involve replacing the oxygen sensor, cleaning or replacing clogged fuel injectors, fixing any vacuum leaks, or replacing a faulty fuel pressure regulator.

7. Is it safe to continue driving my 2018 Honda CR-V with the P0172 code?

- It is not recommended to drive the vehicle for an extended period with the P0172 code as it can lead to reduced engine performance and potential damage to the catalytic converter.

8. Will resetting the check engine light resolve the P0172 code in a 2018 Honda CR-V?

- Resetting the check engine light may temporarily clear the code, but if the underlying issue causing the rich fuel condition is not addressed, the code is likely to reappear.

9. How much does it typically cost to fix the P0172 code in a 2018 Honda CR-V?

- The cost of fixing the P0172 code can vary depending on the exact cause, but it may range from $100 for a simple fix like replacing an air filter to $500 or more for more complex repairs like replacing an oxygen sensor.

10. Can a DIY enthusiast resolve the P0172 code issue in a 2018 Honda CR-V?

- Depending on the root cause, some DIY enthusiasts may be able to address the P0172 code by inspecting and cleaning components like the air filter or vacuum lines. However, more complex repairs may require professional expertise.