AutoCodes – Infiniti – P0172 2005 Infiniti G35

P0172 2005 Infiniti G35 Code - Fuel Injection System Too Rich Bank 1

Quick Answer

With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. Common causes include Faulty Front Heated Oxygen Sensor, Faulty Spark Plugs, Faulty Mass Air Flow (MAF) sensor. 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 2005 Infiniti G35 indicates Fuel Injection System Too Rich Bank 1.
Common causes: Common causes include Faulty Front Heated Oxygen Sensor, Faulty Spark Plugs, Faulty Mass Air Flow (MAF) sensor.
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 3,107

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 May 02, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
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Code P0172 2005 Infiniti G35 Description

With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The Engine Control Module (ECM) calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.
In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the ECM judges the condition as the fuel injection system malfunction and light up the MIL (2 trip detection logic).

OBDII Code P0172 2005 Infiniti G35 - Fuel Injection System Too Rich Bank 1 - AutoCodes.com — P0172 2005 Infiniti G35 Code - Fuel Injection System Too Rich Bank 1

What does this mean?

What are the Possible Causes of the DTC P0172 2005 Infiniti G35?

Faulty Front Heated Oxygen Sensor
Faulty Spark Plugs
Faulty Mass Air Flow (MAF) sensor
Exhaust Gas Leaks
Ignition Misfiring
Incorrect Fuel Pressure
Faulty Fuel Injectors

How to Fix the DTC P0172 2005 Infiniti G35?

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 2005 Infiniti G35 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.

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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 2005 Infiniti G35 Code

1. What does the OBDII code P0172 mean on a 2005 Infiniti G35?

The code P0172 indicates that the fuel injection system on Bank 1 is too rich, meaning there is an excessive amount of fuel being injected into the engine.

2. What are the common symptoms of a P0172 code on a 2005 Infiniti G35?

Common symptoms of a P0172 code include poor fuel economy, rough idling, black smoke from the exhaust, and a noticeable decrease in engine performance.

3. What are the possible causes of a P0172 code on a 2005 Infiniti G35?

Potential causes of a P0172 code include a faulty mass airflow sensor (MAF), a vacuum leak, a malfunctioning oxygen sensor, a clogged fuel filter, or a problem with the fuel injectors.

4. How can I diagnose the cause of a P0172 code on my 2005 Infiniti G35?

To diagnose the cause of a P0172 code, you can perform a visual inspection of the engine components, check for any vacuum leaks, test the MAF sensor, inspect the oxygen sensor, and check the fuel pressure.

5. Can I still drive my 2005 Infiniti G35 with a P0172 code?

It is not recommended to drive your vehicle with a P0172 code, as running too rich can cause damage to the catalytic converter and other engine components. It is best to address the issue as soon as possible.

6. How can I repair a P0172 code on my 2005 Infiniti G35?

Repairing a P0172 code may involve replacing the faulty MAF sensor, fixing any vacuum leaks, replacing the oxygen sensor, cleaning or replacing the fuel filter, or cleaning or replacing the fuel injectors.

7. Will resetting the OBDII code fix the issue with a P0172 code on a 2005 Infiniti G35?

Simply resetting the code may temporarily turn off the check engine light, but it will not fix the underlying issue causing the P0172 code. It is important to diagnose and repair the problem to prevent it from reoccurring.

8. How much does it cost to repair a P0172 code on a 2005 Infiniti G35?

The cost of repairing a P0172 code can vary depending on the exact cause of the issue and the labor rates of the repair shop. It is recommended to get a diagnostic done to determine the exact repair needed.

9. Can a DIY enthusiast fix a P0172 code on a 2005 Infiniti G35?

Depending on your skill level and access to tools, some DIY enthusiasts may be able to address the issue causing a P0172 code. However, complex issues like sensor replacements or fuel system repairs may be best left to professionals.

10. How often does a P0172 code occur on a 2005 Infiniti G35?

The occurrence of a P0172 code can vary depending on the maintenance history of the vehicle and driving conditions. Regular maintenance and prompt attention to any warning lights can help prevent this code from appearing.