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P0420 2006 Infiniti G35 Code - Catalyst System Efficiency Below Threshold Bank 1

Quick Answer

The P0420 diagnostic trouble code (DTC) for a 2006 Infiniti G35 indicates that the catalyst system's efficiency on Bank 1 is below the threshold set by the vehicle's manufacturer. Common causes include Faulty catalytic converter, Damaged oxygen sensors, Exhaust leaks. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means
P0420 2006 Infiniti G35 indicates Catalyst System Efficiency Below Threshold Bank 1.
Common causes
Common causes include Faulty catalytic converter, Damaged oxygen sensors, Exhaust leaks.
Severity
Moderate - service should be scheduled soon.
Can I drive?
The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
What is this?
Table of contents Created and updated by William Orellana on Sep 14, 2024
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Code P0420 2006 Infiniti G35 Description

The P0420 diagnostic trouble code (DTC) for a 2006 Infiniti G35 indicates that the catalyst system's efficiency on Bank 1 is below the threshold set by the vehicle's manufacturer. The catalyst system is responsible for reducing harmful emissions by converting toxic gases produced during combustion into less harmful substances before they exit the vehicle's exhaust system. When the catalyst system efficiency is below the threshold, it means that the catalytic converter is not functioning as intended, leading to increased emissions and potentially failing an emissions test.

OBDII Code P0420 2006 Infiniti G35 - Catalyst System Efficiency Below Threshold Bank 1
P0420 2006 Infiniti G35 Code - Catalyst System Efficiency Below Threshold Bank 1

Common Causes of P0420 2006 Infiniti G35

  1. Faulty catalytic converter
  2. Damaged oxygen sensors
  3. Exhaust leaks
  4. Engine misfires
  5. Issues with the air-fuel mixture

Symptoms of P0420 2006 Infiniti G35

  1. Decreased engine performance
  2. Rough idling or stalling
  3. Reduced fuel efficiency
  4. Check Engine Light illuminated
  5. Failed emissions test

How to Fix P0420 2006 Infiniti G35

  1. Diagnose the specific cause of the P0420 code using a scan tool to identify the underlying issue.
  2. Inspect the catalytic converter, oxygen sensors, and exhaust system for any damage or leaks.
  3. Replace the faulty catalytic converter or oxygen sensors if necessary.
  4. Repair any exhaust leaks or address engine misfires to ensure proper functioning of the catalytic converter.
  5. Clear the DTC and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P0420 2006 Infiniti G35

The cost of repairing a P0420 code on a 2006 Infiniti G35 can vary depending on the specific cause of the issue. Replacing a catalytic converter can range from $500 to $2000, while replacing oxygen sensors typically costs between $100 and $300 per sensor. Repairing exhaust leaks or addressing engine misfires may incur additional costs. Overall, the total repair cost for a P0420 code can range from $500 to $2500, including parts and labor. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to check local rates for a more accurate estimate.

What does this mean?

Tech Notes for P0420 2006 Infiniti G35

As the code description implies the P0420 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0420 code is combined with other codes, try fixing the other codes first.

When is the Code Detected?

- Three way catalytic converter Bank 1 does not operate properly.
- Three way catalyst converter Bank 1 does not have enough oxygen storage capacity.

Need more information about the P0420 2006 Infiniti G35 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 P0420 2006 Infiniti G35 Code

1. What are the common symptoms of OBDII code P0420 on a 2006 Infiniti G35?

- Common symptoms include a noticeable decrease in fuel efficiency, the illumination of the check engine light, and a possible lack of engine power.

2. What does the OBDII code P0420 indicate on a 2006 Infiniti G35?

- P0420 indicates that the catalyst system efficiency on bank 1 is below the threshold, meaning the catalytic converter is not performing as expected.

3. What are the possible causes of OBDII code P0420 on a 2006 Infiniti G35?

- The common causes of P0420 include a faulty catalytic converter, oxygen sensor issues, exhaust leaks, engine misfires, or a faulty mass airflow sensor.

4. Can a bad oxygen sensor trigger OBDII code P0420 on a 2006 Infiniti G35?

- Yes, a malfunctioning oxygen sensor can lead to a P0420 code as it may provide incorrect data to the engine control module, impacting the catalytic converter's efficiency.

5. How can I diagnose the cause of OBDII code P0420 on my 2006 Infiniti G35?

- Diagnosis typically involves checking the oxygen sensors' readings, inspecting the catalytic converter for physical damage, and looking for exhaust leaks or other issues in the system.

6. Is it safe to continue driving with OBDII code P0420 on a 2006 Infiniti G35?

- It is generally not recommended to drive with a P0420 code as it can lead to further damage to the catalytic converter and potentially affect the vehicle's performance.

7. Are there any DIY repair tips for fixing OBDII code P0420 on a 2006 Infiniti G35?

- DIY repair options may include checking for exhaust leaks, replacing oxygen sensors, or cleaning the mass airflow sensor, but it's crucial to ensure proper diagnosis before attempting repairs.

8. How much does it typically cost to repair OBDII code P0420 on a 2006 Infiniti G35?

- The cost of repairing a P0420 code can vary depending on the underlying issue. Costs may range from a few hundred dollars for sensor replacement to over a thousand dollars for a new catalytic converter.

9. Can resetting the OBDII code P0420 on a 2006 Infiniti G35 make it go away permanently?

- Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing P0420 is not addressed, the code is likely to reappear after some driving cycles.

10. How can I prevent OBDII code P0420 from reoccurring on my 2006 Infiniti G35?

- Regular maintenance, such as timely replacement of oxygen sensors, fixing engine misfires promptly, and using high-quality fuel, can help prevent the recurrence of P0420.

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