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P1144 2003 Infiniti G35 Code - Heated Oxygen Sensor 1 Rich Shift Monitoring

Quick Answer

The P1144 diagnostic trouble code (DTC) for a 2003 Infiniti G35 refers to "Heated Oxygen Sensor 1 Rich Shift Monitoring." This code indicates that the oxygen sensor located before the catalytic converter is detecting a rich air-fuel mixture in the exhaust stream. Common causes include Faulty oxygen sensor, Leaking or stuck fuel injector, Vacuum leak in the intake system. 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
P1144 2003 Infiniti G35 indicates Heated Oxygen Sensor 1 Rich Shift Monitoring.
Common causes
Common causes include Faulty oxygen sensor, Leaking or stuck fuel injector, Vacuum leak in the intake system.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P1144 2003 Infiniti G35 Description

The P1144 diagnostic trouble code (DTC) for a 2003 Infiniti G35 refers to "Heated Oxygen Sensor 1 Rich Shift Monitoring." This code indicates that the oxygen sensor located before the catalytic converter is detecting a rich air-fuel mixture in the exhaust stream. The oxygen sensor measures the amount of oxygen in the exhaust gases and provides feedback to the engine control module (ECM) to adjust the air-fuel ratio for optimal combustion.

OBDII Code P1144 2003 Infiniti G35 - Heated Oxygen Sensor 1 Rich Shift Monitoring
P1144 2003 Infiniti G35 Code - Heated Oxygen Sensor 1 Rich Shift Monitoring

Common Causes of P1144 2003 Infiniti G35

  1. Faulty oxygen sensor
  2. Leaking or stuck fuel injector
  3. Vacuum leak in the intake system
  4. Malfunctioning mass airflow sensor
  5. Issues with the ECM or wiring harness

Symptoms of P1144 2003 Infiniti G35

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Engine misfires
  4. Check Engine Light illuminated
  5. Increased emissions

How to Fix P1144 2003 Infiniti G35

  1. Diagnose the issue by scanning for DTCs and checking live data with a scan tool.
  2. Inspect the oxygen sensor for proper operation and replace if necessary.
  3. Check fuel injectors for leaks or proper functioning and replace as needed.
  4. Inspect the intake system for vacuum leaks and repair any found.
  5. Test the mass airflow sensor and replace if faulty.

Cost to Fix P1144 2003 Infiniti G35

The cost of repairing a P1144 code on a 2003 Infiniti G35 can vary depending on the specific cause of the issue. On average, the cost of replacing an oxygen sensor ranges from $150 to $300, while diagnosing and repairing other potential causes such as fuel injectors or vacuum leaks can increase the cost. Labor rates at auto repair shops can vary, but typically range from $80 to $150 per hour. It's recommended to consult with a qualified mechanic to get a more accurate estimate based on your specific vehicle and location.

What does this mean?

Tech Notes for P1144 2003 Infiniti G35

Replacing the O2 Sensor 1 Bank 1 usually takes care of the problem.

When is the Code Detected?

An excessively high voltage from the sensor is sent to Engine Control Module (ECM).

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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 P1144 2003 Infiniti G35 Code

1. What are common symptoms of OBDII code P1144 on a 2003 Infiniti G35?

The common symptoms of code P1144 in a 2003 Infiniti G35 include a decrease in fuel efficiency, rough idling, and potential engine stalling.

2. What does OBDII code P1144 on a 2003 Infiniti G35 indicate?

Code P1144 on a 2003 Infiniti G35 indicates an issue with the Heated Oxygen Sensor 1 Rich Shift Monitoring system.

3. What are the possible causes of OBDII code P1144 on a 2003 Infiniti G35?

Possible causes of code P1144 on a 2003 Infiniti G35 include a faulty Heated Oxygen Sensor (HO2S), a vacuum leak, a malfunctioning fuel injector, or issues with the engine's air intake system.

4. How can I diagnose the cause of OBDII code P1144 on my 2003 Infiniti G35?

To diagnose the cause of code P1144 on a 2003 Infiniti G35, you can use an OBDII scanner to read the code and then inspect the Heated Oxygen Sensor, check for vacuum leaks, test the fuel injectors, and examine the air intake system for any issues.

5. Can I still drive my 2003 Infiniti G35 with OBDII code P1144?

It is not recommended to drive your 2003 Infiniti G35 with OBDII code P1144, as it can lead to further damage to the engine and emissions system. It is best to address the issue promptly.

6. How do I repair OBDII code P1144 on my 2003 Infiniti G35?

Repairing code P1144 on a 2003 Infiniti G35 involves replacing the faulty Heated Oxygen Sensor, fixing any vacuum leaks, addressing fuel injector problems, or repairing issues with the air intake system.

7. Is it possible to reset OBDII code P1144 on a 2003 Infiniti G35?

While you can reset the code using an OBDII scanner, it is important to address the underlying issue causing code P1144 on your 2003 Infiniti G35 to prevent it from reoccurring.

8. How much does it cost to fix OBDII code P1144 on a 2003 Infiniti G35?

The cost to fix code P1144 on a 2003 Infiniti G35 can vary depending on the cause of the issue. Costs may include the price of a new Heated Oxygen Sensor, labor costs, and any additional repairs needed.

9. Can a DIY enthusiast repair OBDII code P1144 on a 2003 Infiniti G35?

While some DIY enthusiasts may have the skills to address code P1144 on a 2003 Infiniti G35, it is recommended to have the repair done by a professional mechanic to ensure proper diagnosis and resolution of the issue.

10. How often does OBDII code P1144 occur in a 2003 Infiniti G35?

OBDII code P1144 can occur sporadically in a 2003 Infiniti G35, depending on the condition of the vehicle and maintenance history. Regular inspections and maintenance can help prevent this code from appearing.

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