Engine-Codes.com
Engine-Codes – Infiniti – P1146 2003 Infiniti G35

P1146 2003 Infiniti G35 Code - Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1

Quick Answer

The diagnostic trouble code P1146 in a 2003 Infiniti G35 specifically refers to the Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1. Common causes include Faulty heated oxygen sensor 2, Wiring or connector issues in the oxygen sensor circuit, Exhaust leaks near the oxygen 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
P1146 2003 Infiniti G35 indicates Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1.
Common causes
Common causes include Faulty heated oxygen sensor 2, Wiring or connector issues in the oxygen sensor circuit, Exhaust leaks near the oxygen 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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P1146 2003 Infiniti G35 Description

The diagnostic trouble code P1146 in a 2003 Infiniti G35 specifically refers to the Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1. This code indicates that the engine control module (ECM) has detected that the voltage from the downstream oxygen sensor in Bank 1 is below the minimum threshold. The heated oxygen sensor (HO2S) 2 is responsible for monitoring the exhaust gases after they have passed through the catalytic converter. It measures the oxygen levels in the exhaust gases and provides feedback to the ECM to adjust the air-fuel mixture for optimal combustion.

OBDII Code P1146 2003 Infiniti G35 - Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1
P1146 2003 Infiniti G35 Code - Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1

Common Causes of P1146 2003 Infiniti G35

  1. Faulty heated oxygen sensor 2
  2. Wiring or connector issues in the oxygen sensor circuit
  3. Exhaust leaks near the oxygen sensor
  4. Engine running rich or lean
  5. Faulty ECM

Symptoms of P1146 2003 Infiniti G35

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

How to Fix P1146 2003 Infiniti G35

  1. Diagnose the issue by using a scan tool to retrieve the fault codes and perform a visual inspection of the oxygen sensor and its wiring.
  2. Test the oxygen sensor using a multimeter to check for proper voltage and resistance.
  3. Replace the heated oxygen sensor 2 if it is determined to be faulty.
  4. Check and repair any damaged wiring or connectors in the oxygen sensor circuit.
  5. Clear the fault codes and perform a test drive to ensure the issue has been resolved.

Cost to Fix P1146 2003 Infiniti G35

The cost of repairing the Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1 code in a 2003 Infiniti G35 can vary depending on the cause of the issue and the labor rates in your area. Generally, the cost of a new heated oxygen sensor 2 can range from $50 to $200, depending on the brand and quality. Labor costs for this repair can range from $100 to $300, depending on the shop's hourly rate and the time required for diagnosis and replacement. Overall, you can expect to pay between $150 and $500 for this repair. It's always advisable to get a few quotes from different auto repair shops to ensure you're getting a fair price.

What does this mean?

Tech Notes for P1146 2003 Infiniti G35

Replacing the O2 Sensor 2 usually takes care of the problem

Need more information about the P1146 2003 Infiniti G35 code?

Need more information on how to fix the P1146 2003 Infiniti G35 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1146 2003 Infiniti G35 code diagnosed by a professional: Find a repair shop in your area

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 P1146 2003 Infiniti G35 Code

1. What are the common symptoms of OBDII code P1146 in a 2003 Infiniti G35?

The common symptoms of code P1146 include poor engine performance, decreased fuel efficiency, and the illumination of the Check Engine Light.

2. What does OBDII code P1146 "Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 1" mean for a 2003 Infiniti G35?

This code indicates that the heated oxygen sensor 2 in bank 1 is detecting a voltage below the expected minimum level, potentially signaling an issue with the sensor or the engine's air-fuel mixture.

3. What are the possible causes of OBDII code P1146 in a 2003 Infiniti G35?

Possible causes of code P1146 include a faulty heated oxygen sensor 2, wiring issues in the oxygen sensor circuit, a vacuum leak, exhaust system leaks, or a problem with the engine's air-fuel ratio.

4. How can I diagnose the cause of OBDII code P1146 in my 2003 Infiniti G35?

Diagnosing code P1146 typically involves using a scan tool to monitor the oxygen sensor's voltage readings, checking the sensor's wiring for damage, inspecting the exhaust system for leaks, and performing a vacuum leak test.

5. Can I drive my 2003 Infiniti G35 with OBDII code P1146?

It is not recommended to drive your vehicle with code P1146 present, as it can lead to reduced engine performance and fuel efficiency. It is best to address the underlying issue promptly.

6. How can I repair OBDII code P1146 in my 2003 Infiniti G35?

Repairing code P1146 may involve replacing the heated oxygen sensor 2 in bank 1, repairing any damaged wiring in the sensor circuit, fixing vacuum leaks, addressing exhaust system leaks, or correcting issues with the air-fuel mixture.

7. Will resetting the OBDII system clear code P1146 from my 2003 Infiniti G35?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing P1146 is not addressed, the code is likely to return after some driving cycles.

8. How much does it cost to fix OBDII code P1146 in a 2003 Infiniti G35?

The cost to fix code P1146 can vary depending on the root cause of the issue. Expenses may include the cost of a new heated oxygen sensor, labor costs for diagnostics and repairs, and any additional parts or services needed.

9. Can a DIY enthusiast replace the heated oxygen sensor to fix OBDII code P1146 in a 2003 Infiniti G35?

Replacing the heated oxygen sensor can be a DIY-friendly repair for those with some mechanical experience and the necessary tools. However, proper diagnostic steps should be taken to ensure the sensor is the root cause of code P1146.

10. How often should the oxygen sensors be inspected in a 2003 Infiniti G35 to prevent OBDII code P1146?

It is advisable to inspect the oxygen sensors during routine maintenance or whenever symptoms of poor engine performance or decreased fuel efficiency arise. Regular inspection can help catch potential issues before they trigger code P1146.

Discuss the causes and fixes for P1146 2003 Infiniti G35 OBDII Code

Submit a New Comment

Code P1146 2003 Infiniti G35 comments

No comments found for this page.