AutoCodes – Nissan – P0420 2007 Nissan Murano

P0420 2007 Nissan Murano Code - Catalyst System Efficiency Below Threshold Bank 1

Quick Answer

The Engine Control Module (ECM) monitors the switching frequency ratio of heated oxygen sensors 1 (front O2 sensor) and heated oxygen sensors 2 (rear O2 sensor). Common causes include Faulty Three-way Catalyst Converter Bank 1, Exhaust Tube, Intake Air 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 2007 Nissan Murano indicates Catalyst System Efficiency Below Threshold Bank 1.
Common causes: Common causes include Faulty Three-way Catalyst Converter Bank 1, Exhaust Tube, Intake Air 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.

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Code Popularity 22,017

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 20, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0420 2007 Nissan Murano Description

The Engine Control Module (ECM) monitors the switching frequency ratio of heated oxygen sensors 1 (front O2 sensor) and heated oxygen sensors 2 (rear O2 sensor).
A three way catalyst converter (Manifold) with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2. As oxygen storage capacity decreases, the heated oxygen sensor 2 switching frequency will increase.
When the frequency ratio of heated oxygen sensors 1 and 2 approaches a specified limit value, the three way catalyst malfunction is diagnosed.

OBDII Code P0420 2007 Nissan Murano - Catalyst System Efficiency Below Threshold Bank 1 - AutoCodes.com — P0420 2007 Nissan Murano Code - Catalyst System Efficiency Below Threshold Bank 1

What does this mean?

What are the Possible Causes of the DTC P0420 2007 Nissan Murano?

Faulty Three-way Catalyst Converter Bank 1
Exhaust Tube
Intake Air Leaks
Faulty Oxygen (O2) Sensor
Faulty Fuel injector(s)
Leaking Fuel Injector (s)
Faulty Spark plugs
Improper Ignition Timing
Faulty Engine Control Module (ECM)
Dirty Air Filter

How to Fix the DTC P0420 2007 Nissan Murano?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

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 correct the problem. If the P0420 code is combined with other codes, try fixing the other codes first.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0420 2007 Nissan Murano code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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 2007 Nissan Murano Code

1. What are the common symptoms of OBDII code P0420 on a 2007 Nissan Murano?

- Common symptoms include the check engine light coming on, reduced fuel efficiency, and potential lack of power or acceleration.

2. What does the OBDII code P0420 indicate on a 2007 Nissan Murano?

- The code indicates that the catalyst system efficiency in Bank 1 is below the threshold, meaning the catalytic converter is not functioning optimally.

3. What are the possible causes of OBDII code P0420 on a 2007 Nissan Murano?

- Causes can include a faulty catalytic converter, oxygen sensor issues, exhaust leaks, engine misfires, or a malfunctioning air-fuel ratio sensor.

4. Can driving with a P0420 code on a 2007 Nissan Murano cause further damage?

- Continuing to drive with a P0420 code may lead to decreased fuel efficiency and potential damage to the engine or emissions system over time.

5. How can I diagnose and repair OBDII code P0420 on a 2007 Nissan Murano?

- Diagnosing typically involves checking the catalytic converter, oxygen sensors, and exhaust system for issues. Repair may involve replacing components like the catalytic converter or sensors.

6. Are there any DIY tips for addressing OBDII code P0420 on a 2007 Nissan Murano?

- DIY tips include checking for exhaust leaks, ensuring proper engine maintenance, and inspecting sensor connections before considering professional repair.

7. Is it safe to drive the 2007 Nissan Murano with a P0420 code until it is repaired?

- It is generally safe to drive the vehicle for a short period with the P0420 code, but it is recommended to address the issue promptly to avoid potential damage and ensure optimal performance.

8. How much does it typically cost to repair OBDII code P0420 on a 2007 Nissan Murano?

- The cost of repair can vary depending on the specific issue causing the code, but it may range from a few hundred to over a thousand dollars, especially if the catalytic converter needs replacement.

9. Can resetting the OBDII code P0420 on a 2007 Nissan Murano temporarily fix the issue?

- Resetting the code may temporarily turn off the check engine light, but if the underlying issue is not addressed, the code is likely to reappear once the system detects the problem again.

10. How often does OBDII code P0420 occur in 2007 Nissan Muranos?

- OBDII code P0420 can occur in 2007 Nissan Muranos due to various factors such as age, mileage, and maintenance history, but it is a relatively common issue in vehicles with higher mileage or poor maintenance.