AutoCodes – Honda – P0172 2020 Honda CR-V

P0172 2020 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 2020 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 472

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
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Code P0172 2020 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 2020 Honda CR-V - Fuel System Too Rich Bank 1 - AutoCodes.com — P0172 2020 Honda CR-V Code - Fuel System Too Rich Bank 1

What does this mean?

What are the Possible Causes of the DTC P0172 2020 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 2020 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 2020 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 2020 Honda CR-V code?

Need more information on how to fix the P0172 2020 Honda CR-V code? Get Access to Factory Service Manuals

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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 2020 Honda CR-V Code

What does OBDII code P0172 mean for a 2020 Honda CR-V?

OBDII code P0172 indicates that the engine control module (ECM) has detected a rich fuel condition in Bank 1, meaning there is too much fuel or not enough air in the combustion mixture.

What are the common symptoms associated with the P0172 code?

Symptoms may include poor fuel economy, rough idling, excessive exhaust emissions, engine stalling, and a noticeable decrease in engine performance.

What could cause the P0172 code to trigger in a 2020 Honda CR-V?

Potential causes include a faulty fuel injector, a damaged or clogged air filter, a malfunctioning mass air flow (MAF) sensor, fuel pressure regulator issues, or vacuum leaks.

How can I diagnose the cause of the P0172 code?

Start by checking for vacuum leaks, inspecting the air intake and MAF sensor, testing fuel pressure, and examining the fuel injectors. Using a scan tool can also provide additional data for more accurate diagnosis.

What repairs are typically needed to fix the P0172 code?

Repairs may involve replacing faulty fuel injectors, cleaning or replacing the MAF sensor, fixing vacuum leaks, or addressing fuel pressure regulator issues. In some cases, a software update may be necessary.

Can I drive my Honda CR-V with the P0172 code?

While it may be possible to drive the vehicle, it's not recommended as a rich fuel condition can lead to poor engine performance and potential damage over time.

How can I prevent the P0172 code from occurring in the future?

Regular maintenance, such as replacing air and fuel filters, keeping the fuel system clean, and checking for vacuum leaks can help prevent the P0172 code from reappearing.

Is it necessary to clear the P0172 code after repairs?

Yes, after addressing the underlying issue, you should clear the code using an OBDII scanner and then take the vehicle for a test drive to ensure the code does not return.

Could a faulty oxygen sensor cause the P0172 code to appear?

Yes, a malfunctioning oxygen sensor can lead to incorrect readings, causing the engine control module to adjust the air-fuel mixture improperly, which may trigger the P0172 code.