AutoCodes – Nissan – P0172 2008 Nissan Maxima

P0172 2008 Nissan Maxima 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 2008 Nissan Maxima 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 3,047

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
Comments
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Code P0172 2008 Nissan Maxima 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 2008 Nissan Maxima - Fuel Injection System Too Rich Bank 1 - AutoCodes.com — P0172 2008 Nissan Maxima Code - Fuel Injection System Too Rich Bank 1

What does this mean?

What are the Possible Causes of the DTC P0172 2008 Nissan Maxima?

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 2008 Nissan Maxima?

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 2008 Nissan Maxima 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 2008 Nissan Maxima 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 2008 Nissan Maxima Code

1. What are the common symptoms of OBDII code P0172 on a 2008 Nissan Maxima?

- Common symptoms include decreased fuel efficiency, rough idling, engine hesitation, and a strong smell of fuel from the exhaust.

2. What does the OBDII code P0172 on a 2008 Nissan Maxima mean?

- The code indicates that the fuel injection system is running too rich on bank 1, meaning there is too much fuel being injected into the engine.

3. What are the possible causes of OBDII code P0172 on a 2008 Nissan Maxima?

- Common causes include a faulty oxygen sensor, clogged fuel injectors, a dirty air filter, a malfunctioning mass airflow sensor, or a vacuum leak.

4. How can I diagnose the issue causing OBDII code P0172 on my 2008 Nissan Maxima?

- You can start by checking the oxygen sensor, fuel injectors, air filter, mass airflow sensor, and vacuum lines for any signs of damage or malfunction.

5. Can driving with OBDII code P0172 on a 2008 Nissan Maxima cause further damage?

- Continuing to drive with a rich fuel mixture can potentially damage the catalytic converter and other engine components over time.

6. What are some repair tips for fixing OBDII code P0172 on a 2008 Nissan Maxima?

- Some repair tips include cleaning or replacing the oxygen sensor, cleaning the fuel injectors, replacing the air filter, cleaning the mass airflow sensor, and checking for vacuum leaks.

7. How much does it typically cost to repair OBDII code P0172 on a 2008 Nissan Maxima?

- Repair costs can vary depending on the specific cause of the issue, but it can range from around $100 for a simple fix like replacing an air filter to several hundred dollars for more complex repairs.

8. Can I reset the OBDII code P0172 on my 2008 Nissan Maxima by disconnecting the battery?

- While disconnecting the battery may temporarily clear the code, it is not a permanent solution. It is best to diagnose and repair the underlying issue to prevent the code from reappearing.

9. How long does it take to repair OBDII code P0172 on a 2008 Nissan Maxima?

- The repair time can vary depending on the specific cause of the issue and the extent of the repairs needed. Simple fixes may take an hour or two, while more complex issues could take several hours or more.

10. Can I continue driving my 2008 Nissan Maxima with OBDII code P0172 without fixing it?

- It is not recommended to continue driving with a rich fuel mixture, as it can lead to decreased fuel efficiency, engine performance issues, and potential damage to engine components. It is best to address the issue promptly.