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P1147 2004 Infiniti G35 Code - Heated Oxygen Sensor 2 Maximum Voltage Monitoring Bank 1

Quick Answer

The P1147 code for a 2004 Infiniti G35 indicates an issue with the Heated Oxygen Sensor 2 Maximum Voltage Monitoring Bank 1. Common causes include Faulty oxygen sensor: The sensor itself may be malfunctioning and providing incorrect voltage readings, Wiring issues: Damaged or corroded wiring connecting the sensor to the ECM can cause voltage irregularities, Vacuum leaks: Air leaks in the intake system can disrupt the air-fuel mixture and affect sensor readings. 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
P1147 2004 Infiniti G35 indicates Heated Oxygen Sensor 2 Maximum Voltage Monitoring Bank 1.
Common causes
Common causes include Faulty oxygen sensor: The sensor itself may be malfunctioning and providing incorrect voltage readings, Wiring issues: Damaged or corroded wiring connecting the sensor to the ECM can cause voltage irregularities, Vacuum leaks: Air leaks in the intake system can disrupt the air-fuel mixture and affect sensor readings.
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 11, 2024
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Code P1147 2004 Infiniti G35 Description

The P1147 code for a 2004 Infiniti G35 indicates an issue with the Heated Oxygen Sensor 2 Maximum Voltage Monitoring Bank 1. The Heated Oxygen Sensor (HO2S) is a critical component of the vehicle's emissions system, responsible for monitoring the oxygen content in the exhaust gases to ensure optimal fuel efficiency and emissions control. In this case, the code specifically refers to the second oxygen sensor in Bank 1 of the engine.

OBDII Code P1147 2004 Infiniti G35 - Heated Oxygen Sensor 2 Maximum Voltage Monitoring Bank 1
P1147 2004 Infiniti G35 Code - Heated Oxygen Sensor 2 Maximum Voltage Monitoring Bank 1

Common Causes of P1147 2004 Infiniti G35

  1. Faulty oxygen sensor: The sensor itself may be malfunctioning and providing incorrect voltage readings.
  2. Wiring issues: Damaged or corroded wiring connecting the sensor to the ECM can cause voltage irregularities.
  3. Vacuum leaks: Air leaks in the intake system can disrupt the air-fuel mixture and affect sensor readings.
  4. Exhaust leaks: Leaks in the exhaust system can lead to false oxygen sensor readings.
  5. Engine performance issues: Problems with the engine, such as misfires or compression issues, can affect sensor readings.

Symptoms of P1147 2004 Infiniti G35

  1. Decreased fuel efficiency: A faulty oxygen sensor can cause the engine to run rich or lean, leading to decreased fuel efficiency.
  2. Rough idling: Incorrect air-fuel mixture can result in rough idling or stalling at low speeds.
  3. Check Engine Light: The P1147 code will trigger the Check Engine Light on the dashboard.
  4. Failed emissions test: A malfunctioning oxygen sensor can cause the vehicle to fail emissions testing.

How to Fix P1147 2004 Infiniti G35

  1. Diagnose the issue: Use a scan tool to retrieve the fault code and perform further diagnostics to identify the specific cause of the problem.
  2. Inspect the sensor and wiring: Check the oxygen sensor and its wiring harness for any visible damage or corrosion.
  3. Replace the oxygen sensor: If the sensor is faulty, replace it with a new one following the manufacturer's specifications.
  4. Repair wiring issues: Repair or replace any damaged wiring connecting the sensor to the ECM.
  5. Clear the code: After completing the repair, clear the fault code from the ECM's memory and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1147 2004 Infiniti G35

The cost of repairing a P1147 code on a 2004 Infiniti G35 can vary depending on the exact cause of the issue and the cost of parts and labor in your area. In general, replacing an oxygen sensor can cost between $100 to $300 for the part, with labor costs adding an additional $100 to $200. Overall, you can expect to pay anywhere from $200 to $500 for this repair, but prices may be higher if additional components need to be replaced or if the issue is more complex. It's always recommended to get a detailed estimate from a qualified mechanic before proceeding with the repair.

What does this mean?

Tech Notes for P1147 2004 Infiniti G35

Replacing the O2 Sensor 2 usually takes care of the problem

When is the Code Detected?

The P1147 code is triggered when the maximum voltage from the sensor is not reached to the specified voltage.

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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 P1147 2004 Infiniti G35 Code

1. What does OBDII code P1147 mean for a 2004 Infiniti G35?

P1147 indicates that the heated oxygen sensor 2 (HO2S2) on Bank 1 has exceeded its maximum voltage threshold, suggesting a potential issue with the sensor or related systems.

2. What are the symptoms of code P1147 in a 2004 Infiniti G35?

Common symptoms include poor fuel economy, rough idling, reduced engine performance, and the check engine light being illuminated.

3. What causes code P1147 to appear on a 2004 Infiniti G35?

Possible causes include a faulty Bank 1, Sensor 2 oxygen sensor, damaged wiring or connectors, exhaust leaks, or a malfunctioning engine control module (ECM).

4. Can I drive my 2004 Infiniti G35 with code P1147?

While the car may still drive, it's not recommended to ignore the issue because it can lead to poor performance, higher emissions, and potential damage to other components.

5. How do I diagnose code P1147 on a 2004 Infiniti G35?

Diagnosis involves checking the oxygen sensor wiring and connectors for damage, testing the sensor's voltage output with a multimeter, and inspecting for exhaust leaks.

6. How do I fix code P1147 on my 2004 Infiniti G35?

Repairs may include replacing the Bank 1, Sensor 2 oxygen sensor, fixing damaged wiring, sealing exhaust leaks, or reprogramming or replacing the ECM if necessary.

7. How much does it cost to fix code P1147 on a 2004 Infiniti G35?

The cost varies depending on the repair, but replacing an oxygen sensor typically ranges from $150 to $300, including parts and labor.

8. Is code P1147 related to emissions issues?

Yes, a faulty oxygen sensor can cause improper air-fuel mixture readings, leading to increased emissions and potentially failing an emissions test.

9. What is the role of Bank 1, Sensor 2 on a 2004 Infiniti G35?

Bank 1, Sensor 2 is the downstream oxygen sensor that monitors the efficiency of the catalytic converter and helps maintain proper emissions.

10. Can a dirty air filter cause code P1147 on a 2004 Infiniti G35?

While unlikely, a severely restricted air filter can affect engine performance and may indirectly contribute to sensor issues. Regular maintenance is essential to avoid related problems.

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