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P1164 2003 Infiniti G35 Code - HO2S21 Rich Shift Monitoring

Quick Answer

The P1164 diagnostic trouble code (DTC) for a 2003 Infiniti G35 indicates an issue with the Heated Oxygen Sensor 2 Bank 1 (HO2S21) rich shift monitoring. Common causes include Faulty HO2S21 sensor, Vacuum leaks in the intake system, Dirty or clogged fuel injectors. 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
P1164 2003 Infiniti G35 indicates HO2S21 Rich Shift Monitoring.
Common causes
Common causes include Faulty HO2S21 sensor, Vacuum leaks in the intake system, Dirty or clogged fuel injectors.
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 16, 2024
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Code P1164 2003 Infiniti G35 Description

The P1164 diagnostic trouble code (DTC) for a 2003 Infiniti G35 indicates an issue with the Heated Oxygen Sensor 2 Bank 1 (HO2S21) rich shift monitoring. This code is triggered when the Engine Control Module (ECM) detects that the air-fuel mixture is running too rich in the exhaust system. The HO2S21 sensor is responsible for monitoring the oxygen levels in the exhaust gases to ensure the engine is running at optimal efficiency.

OBDII Code P1164 2003 Infiniti G35 - HO2S21 Rich Shift Monitoring
P1164 2003 Infiniti G35 Code - HO2S21 Rich Shift Monitoring

Common Causes of P1164 2003 Infiniti G35

  1. Faulty HO2S21 sensor
  2. Vacuum leaks in the intake system
  3. Dirty or clogged fuel injectors
  4. Malfunctioning fuel pressure regulator
  5. Issues with the mass airflow sensor

Symptoms of P1164 2003 Infiniti G35

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Engine misfires
  4. Strong fuel odor from the exhaust
  5. Illuminated check engine light

How to Fix P1164 2003 Infiniti G35

  1. Diagnose the root cause of the rich air-fuel mixture by using a scan tool to monitor live data from the HO2S21 sensor.
  2. Inspect the HO2S21 sensor for proper operation and replace if necessary.
  3. Check for any vacuum leaks in the intake system and repair as needed.
  4. Clean or replace clogged fuel injectors to ensure proper fuel delivery.
  5. Test and replace the fuel pressure regulator if it is malfunctioning.

Cost to Fix P1164 2003 Infiniti G35

The cost of repairing a P1164 DTC on a 2003 Infiniti G35 can vary depending on the specific cause of the issue. Typically, replacing a faulty HO2S21 sensor can cost between $100 and $200 for the part, with additional labor costs ranging from $100 to $200. If other components need to be replaced or repaired, such as fuel injectors or the fuel pressure regulator, the total repair cost could increase. It's recommended to consult with a qualified mechanic or auto repair shop to get an accurate estimate based on your vehicle's specific needs and location. Labor rates at auto repair shops can vary, so it's advisable to inquire about rates before proceeding with the repair.

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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 P1164 2003 Infiniti G35 Code

1. What are the common symptoms of OBDII code P1164 in a 2003 Infiniti G35?

- Common symptoms include poor fuel economy, rough idling, engine hesitation, and possibly a Check Engine light illuminated on the dashboard.

2. What does the OBDII code P1164 "HO2S21 Rich Shift Monitoring" mean in a 2003 Infiniti G35?

- This code indicates that the oxygen sensor 2, bank 1 (HO2S21), is detecting a rich air-fuel mixture during shifts.

3. What are the possible causes of OBDII code P1164 in a 2003 Infiniti G35?

- The code P1164 in a 2003 Infiniti G35 can be triggered by issues such as a faulty oxygen sensor, vacuum leaks, fuel pressure problems, or a malfunctioning fuel injector.

4. How can I diagnose the OBDII code P1164 in my 2003 Infiniti G35?

- Diagnosing OBDII code P1164 involves using a scan tool to read the code, checking the oxygen sensor readings, inspecting for vacuum leaks, and testing the fuel pressure and injectors.

5. What are the potential repair options for OBDII code P1164 in a 2003 Infiniti G35?

- Repair options for code P1164 may include replacing the oxygen sensor, fixing any vacuum leaks, addressing fuel pressure issues, or cleaning/replacing faulty fuel injectors.

6. Can I continue driving my 2003 Infiniti G35 with OBDII code P1164 present?

- It is not recommended to drive your vehicle with code P1164 active, as it can lead to decreased fuel efficiency and potential damage to the engine over time.

7. How much does it typically cost to repair OBDII code P1164 in a 2003 Infiniti G35?

- The cost of repairing code P1164 can vary depending on the specific cause of the issue, but it may range from $100 to $500 or more, including parts and labor.

8. Will resetting the OBDII system turn off the P1164 code in my 2003 Infiniti G35?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear after driving the vehicle for some time.

9. How urgent is it to address OBDII code P1164 in a 2003 Infiniti G35?

- While the vehicle may still be operational with code P1164, it is advisable to address the issue promptly to prevent further damage and maintain optimal engine performance.

10. Can a DIY enthusiast fix OBDII code P1164 in a 2003 Infiniti G35?

- Depending on the specific cause, some DIY enthusiasts with the necessary skills and tools may be able to address code P1164 themselves by replacing the oxygen sensor, fixing vacuum leaks, or cleaning fuel injectors.

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