P0420 nissan

Nissan P0420 – Meaning, Causes, Symptoms, & Fixes

Nissan Code P0420 Definition

Catalyst system efficiency below threshold (Bank 1).

What Does P0420 Mean For Your Nissan?

The function of the catalytic converter is to break down harmful pollutants that are created by your Nissan during the combustion cycle and convert them into harmless gases. Code P0420 indicates that the catalytic converter is not functioning efficiently, therefore increasing the output of harmful pollutants by your Nissan.

Nissan P0420 Symptoms

  • Check Engine Light is on
  • Lack of power from the engine
  • Decreased fuel economy
  • Rotten egg or sulfur smell

Nissan P0420 Causes

  • Faulty oxygen sensor
  • Worn and internally failing catalytic converter
  • Leak in exhaust system

Nissan Code P0420 Severity – Moderate

While P0420 does not pose a danger to the driver and may not produce any symptoms with issues related to drivability, it can cause severe damage to other components of your Nissan if not addressed in a timely manner. It is recommended that you address P0420 as soon as possible to keep the cost of the repair to a minimum.

Nissan Code P0420 Common Diagnosis Mistakes

Do not overlook other codes that are paired along with P0420. Nissan codes P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, P0174, and P0171 can give false data readings that create conditions which trigger code P0420. If any other codes are present, they should be addressed first.

Nissan P0420 Diagnosis

Tools Needed to Diagnose:
  1. Scan your Nissan to verify P0420 is the only code present. If other codes are present, they must be addressed first.
  2. Examine the exhaust system for damage and leaks. Pay close attention to the exhaust manifold, gaskets, and exhaust pipes pre-catalytic converter. If any leaks are found, repair the leak, clear the code, and complete several drive cycles to verify that was the fix.
  3. With the Nissan running and at normal operating temperature, use the digital multimeter to check the voltage reading of the downstream O2 sensor. The downstream O2 sensor produces a relatively steady voltage reading of approximately 0.45V if the catalytic converter is functioning properly. If the voltage of the downstream O2 sensor is constantly jumping between 0.1V and 0.9V, the catalyst is worn and the catalytic converter needs to be replaced.

Sours: https://www.fixdapp.com/blog/p0420-nissan/
Trouble CodeFault LocationProbable Cause
P0420Catalytic converter system, bank 1 -efficiency below thresholdCatalytic converter, wiring, HO2S 2

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What Does Code P0420 Mean?

OBD II fault code P0420 is a generic code that is defined as ““Catalytic Converter System Bank 1, Efficiency below Threshold”, and is set when the PCM (Powertrain Control Module) detects that the catalytic converter on Bank 1 is operating below a minimum allowable efficiency threshold. Note that “Bank 1” refers to the exhaust system on the bank of cylinders that contains cylinder #1. Note also that the same definition applies to Nissan applications with a single bank of cylinders- on these applications, “Bank 1” can be disregarded.

The purpose of a catalytic converter is to convert harmful exhaust emissions (mainly oxides of nitrogen) into innocuous substances such as water and carbon dioxide. While design specifics vary between manufacturers, all catalytic converters consist of a substrate that is coated with catalysts in the form of inert metals such as platinum, iridium, palladium, and others. Provided that the catalytic converter is at its optimal operating temperature, which also varies between manufacturers depending on the substrate and metals used, the catalysts convert harmful substances into less harmful ones as the exhaust stream passes over the catalysts.

NOTE: Note that the metals used in catalytic converters are called “catalysts” because they cause and sustain the conversion process, but are not themselves consumed in the conversion process.

However, even though most OEM catalytic converters are designed to have very long service lives, there are many factors at work (see Causes section) in all applications that can seriously affect the efficiency of any catalytic converter. Therefore, the PCM uses a very simple, but relatively effective strategy to monitor the efficiency of all catalytic converters on the application on a continuous basis.

In practice, the PCM uses input data from two primary sensors- the #1 (upstream of the catalytic converter) oxygen sensor, and the #2 (downstream of the catalytic converter) oxygen sensor to calculate an efficiency value for the catalytic converter. As a practical matter, the upstream sensor monitors the composition of the exhaust gas, and the PCM makes adjustments to the fuel trims and ignition timing in direct response to input data received from this sensor, while the downstream oxygen sensor monitors the efficiency of the catalytic converter.

If the catalytic converter is in good condition and functioning properly, the signal from the downstream sensor will be almost constant, as opposed to the rapidly changing signal voltage from the upstream sensor. Thus, when the PCM compares the input data from the two oxygen sensors, it expects to see a difference between the two signal voltages, with the signal voltage from the upstream sensor fluctuating sharply, while the signal voltage from the downstream sensor should be fairly constant.

If however, the PCM detects a similar response from both sensors, it uses the degree of similarity to calculate an efficiency value for the catalytic converter based on how similar the two signal voltages are. In most cases, the PCM will set code P0420 and illuminate warning light when it calculates an efficiency value of between 75%, and 70%, with 70% representing the lowest allowable efficiency threshold on most applications.

So why does code P0420 affect some Nissan applications more than others?

While code P0420 can afflict any application, this code is extremely common on Nissan applications such as Sentra, Rogue, Altima, and other models that are fitted with the QR25DE range of engines, which is widely regarded in the global auto repair industry as one of the worst engines Nissan has ever produced.

While this engine has many other faults, its extremely high oil consumption rate is the primary reason why catalytic converters and air/fuel ratio sensors get clogged up with oil, which is the primary factor that affects the efficiency of these components, which in turn, causes code P0420 to set.

In short, the QR25DE engines’ high rate of oil consumption stems from the fact that this engine is a modified version of the older, 2.0L QR20DE engine. By shortening the connecting rods of this engine, its displacement was increased to 2.5L, and while this increased power and torque considerably, the modification had the practical effect of increasing oil consumption because the pistons and piston rings were not reinforced to cope with the increased compression and combustion pressures.

Although Nissan introduced reinforced connecting rods, new pistons and revised piston rings for the QR25DE engine during 2007, the aluminum engine block (as used on the QR20DE engine) was not reinforced, with the result that the high oil consumption rate of the QR25DE engine was only partially corrected.

Other issues with the QR25DE include the facts that the retaining screws holding the throttle flap in position work themselves loose and end up being sucked into the engine, and frequent failures of the pre-catalytic converter. While there are no remedies for the mechanical deficiencies of the QR25DE engine, Nissan has released updated software that changes the fuel delivery characteristics of the fuel management system, which seems to have reduced the high rate of catalytic converter failure on the QR25DE engine range somewhat.

Where is the P0420 sensor located?

The image above shows the location of the catalytic converter (circled) relative to the exhaust manifold on a Nissan Altima fitted with a QR25DE engine. Note that the manifold and catalytic converter form an assembly, which means that the catalytic converter cannot be replaced separately.

What are the common causes of code P0420?

Bear in mind that if reprogramming the PCM does not resolve code P0420 on an application that has a QR25DE engine, there are many other possible causes to consider, some of which could include the following-

  • Unresolved excessive oil consumption (Most common)
  • Excessive fuel pressure, but note that this will almost certainly be indicated by a dedicated trouble code
  • Persistent misfire on one or more cylinders. Note that while misfires on any application can cause catalytic converters to fail, a misfire coupled with a high oil consumption rate will generally cause the converter to fail much sooner than on a misfiring engine with  normal oil consumption rate.
  • Defective engine coolant sensor
  • One or more defective(leaking) fuel injectors
  • Loss of sensitivity of the affected air/fuel ratio sensor due to long use
  • Damaged, burnt, shorted, disconnected, or corroded wiring and/or connectors
  • Defective or contaminated air/fuel ratio sensor. Typical contaminants include engine oil, carbon, engine coolant, and silicon-based compounds found in some aftermarket gasket sealers, and some aftermarket fuel and oil additives
  • Defective catalytic converter
  • Use of incorrect ,unsuitable, or contaminated fuel
  • Failed or failing PCM or other control module, but note that this is a rare event, and the fault must therefore be sought elsewhere before any control module is replaced.

NOTE: While premature failure of catalytic converters due to excessive oil consumption on many Nissan applications is a common occurrence, there are many other possible causes of code P0420 on these applications. Therefore, it is important to record all codes, as well as all available freeze frame data present, and to resolve all additional codes present in the order in which they were stored before condemning the catalytic converter out of hand.

BAT Team Discussions for P0420

  • 2001 Honda Accord
    Error Code P0420 Cat eff. below threshold (Bank 1) 4 cyl. V-tec engine, 01 Accord with 220,000 miles. Should I replace the O2 Sensor in bank one, or is the Cat most likely shot ? And how would I know for sure? Can't pass inspection for emissions....
  • Dodge Intrepid code
    We need mileage and engine and year. Any other codes ? What is repair and tune up history? If it is the cat bad they are under federal warranty for 80k or 8 years. But one of the main causes of cat codes is bad tune up or engine miss or running rich. Also sometimes there is a pcm reflash for the pro...
  • 1999 Honda Accord coding P0420
    Well I've read numerous forums concerning my issue. Pre O2 sensor, cat, post O2 sensor and every combination in between. I have just over 65,000 miles on the car. Called American Honda and they told me my warranty was 8yr or 80K. Of course mine expired in Feb 07. After doing more research I found a ...
  • 01 Toyota Corolla with Cat eff code
    112,000 miles, auto, 1.8l. Has P0420 Cat eff code. Owner reports Cat was replace once under warranty. Graphed post Cat O2 sensor activity and saw it very active, close to same activity as Sensor 1. No other codes or problems found. Fuel trims look good. I'm going to send them to someone for new Cat...
  • 2005 Nissan Altima 2.5
    All, MIL came on on my '05 Altima after 102K miles. Mechanic found error code P0420. I was researching and found the following reference to a TSB" TSB #06004 -- MIL ON WITH DTC P0420: CATALYTIC CONVERTER IS UNDAMAGED. *TT (NHTSA ID #10019113, JANUARY 24 2006) I should note that I've noticed no...
Sours: https://www.troublecodes.net/nissancodes/p0420/
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P0420 NISSAN Code - Catalyst System Efficiency Below Threshold Bank 1

AutoCodes - Nissan - P0420 NISSAN

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What does this mean?

|P0420 NISSAN code possible causes

  • 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 do I fix the P0420 NISSAN code?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|Cost of diagnosing the P0420 NISSAN code

Labor: 1.0

The cost of diagnosing the P0420 NISSAN code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P0420 NISSAN 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.

|What are P0420 NISSAN code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|P0420 NISSAN code 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 Nissan - Catalyst System Efficiency Below Threshold Bank 1 - AutoCodes.com

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|P0420 NISSAN code information for specific Nissan models

|P0420 NISSAN code comments

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Nissan p0420

P0420 Code: Catalyst System Efficiency Below Threshold (Bank 1)

Reading Time: 7minutes

There are many issues that could trigger the Check Engine Light to illuminate. However, if you use an OBD-II scanner and get a P0420 code, you may be having issues with your catalytic converter. 

For a full rundown of what this code entails, read on.

What Does the P0420 Code Mean?

Code P0420 stands for “Catalyst System Efficiency Below Threshold (Bank 1).” Put simply, this code indicates that your car’s computer has detected underperformance from the Bank 1 catalytic converter. 

a catalytic converter of a modern car close up view

Bank 1 refers to the side of the engine that houses the number one cylinder. The opposite side of the engine is Bank 2. 

What are the Possible Causes of the P0420 Code?

A faulty catalytic converter is the most frequent cause of  a P0420 trouble code. Issues that can cause this OBD-II code include:

  • A failed catalytic converter (very common)
  • A faulty oxygen sensor (not very common)
  • Circuit problems, such as damaged wiring and loose connections (not very common)
  • An exhaust leak (not very common)
  • Computer issues (e.g., software in need of an update) (not very common)

The catalytic converter can also fail due to a number of other problems. These include engine performance issues, such as a misfire or improper air/fuel ratio, which can cause the converter to overheat.

Loose wiring of a car

Contaminants like coolant and engine oil can also damage the cat.

What are the Common Symptoms of the P0420 Code?

You may notice the following symptoms if you drive a vehicle with a P0420 trouble code:

P0420 typically means that a converter has worn out or degraded—not obstructed or clogged. But if the case is the latter, it can lead to engine performance problems, such as a lack of power, rough idling, and stalling, which are some of the common signs of a clogged catalytic converter. 

How to Diagnose the P0420 Code

There are numerous potential causes for OBD-II code P0420. As such, diagnosis can be difficult. For an idea of how to troubleshoot the code, check out the videos below:

How to Fix the P0420 Code

There are multiple reasons why code P0420 might be stored. Therefore, there isn’t a “magic bullet” fix for the issue. You’ll need to diagnose the code accurately, as outlined above, then perform any necessary repairs. Usually the catalyst needs to be replaced, and bolt-on catalysts are available for most vehicles.

The code could be triggered by anything from a bad catalytic converter to a faulty oxygen sensor, so you must do your homework.  

car diagnostic tool for car checkup being used by a mechanic

Also, keep in mind that all vehicles are different. When troubleshooting and repairing diagnostic trouble codes, you should consult the factory repair information for your application. 

Repair manuals, such as those from Chilton, are useful, but an ALLDATA subscription is even better. ALLDATA has single-vehicle subscriptions for DIYers that provide detailed factory repair information. 

What is a Catalyst?

The catalysts on today’s vehicles are “Three Way Catalysts,” meaning that they process three harmful gasses, namely NOx (Oxides of Nitrogen), CO (Carbon Monoxide), and HC (Hydrocarbons, which is unburned fuel)

A “catalyst,” by definition, foments changes in other elements without changing itself – the other elements in this case are the three harmful exhaust gasses.

Inside of a catalytic converter showing a honeycomb design

To treat these exhaust gasses, a catalytic converter has within its shell a fine honeycomb type clay “brick” with thousands of tiny “tunnels” tightly arranged so that the exhaust gas must pass through them as it exits the engine. The walls of these tiny tunnels are meticulously coated with certain precious metals that, as the catalyst reaches operating temperature, will either separate nitrogen and oxygen or add molecules of oxygen, but you can’t do both jobs with the same “brick.” Sometimes both “bricks” are in the same shell – more often, they’re not.

The catalyst brick nearest the engine takes care of the NOx and is referred to as the “light-off cat.” This catalyst has to reach a certain temperature to begin the catalytic process of separating NOx into its nitrogen and oxygen components. This is the only catalyst that is monitored by the ECM/PCM.  

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So why is this process necessary? Well, nitrogen and oxygen naturally bind together in the combustion chamber during high combustion temperatures, such as at road speed and when the vehicle is pulling a load.

In the process of doing its job, the light-off (NOx) catalyst stores oxygen; there is an O2 sensor between the engine and the light-off catalyst, and there is another O2 sensor behind the light-off catalyst but in front of the HC/CO catalyst.

The second catalyst, which is farthest from the engine, handles HC and CO by adding molecules of oxygen and converting them to CO2, which is actually good for the environment, since grass, trees, and flowers need CO2 to thrive.

car electronic engine control unit close look

The O2 sensor between the engine and the light-off catalyst “brick” (that’s the Upstream Sensor) monitors the oxygen level in the exhaust and the ECM/PCM uses that input for Fuel Trim adjustments. 

That Upstream O2 signal switches very rapidly in response to Fuel Trim (several times a second). The O2 sensor behind the light-off catalyst (the Downstream Sensor) is also monitoring oxygen, but if the light-off (NOx) catalyst is storing oxygen properly (meaning the catalyst is healthy), the rear O2 sensor signal will be very lazy when compared to the upstream O2. When the ECM/PCM sees the downstream O2 sensor switching at or near the same rate as the upstream O2 sensor, it sets the P0420 code.

Other Notes About P0420 Code

Make sure that you have ruled out other possible causes of inefficiency in the catalyst system before replacing your O2 sensors or catalytic converter. Some car owners make the mistake of replacing a perfectly fine catalytic converter because of a wiring or software issues. It is best to consult a licensed mechanic to ensure that you get a proper diagnosis so that you don’t waste money on replacing parts unnecessarily.

automotive catalytic converter

P0420 Code FAQs

How do I clear a P0420 code?

You can clear the P0420 code temporarily with a scan tool or code reader. The problem is, the code will come back as soon as your car’s primary computer runs its system self-tests. To get the code to go off and stay off, you’ll need to fix the underlying problem that triggered the code in the first place, then clear the code with a scan tool or code reader.

Can a bad O2 sensor cause a P0420 code?

Yes. A typical catalyst monitor uses the signal from the downstream oxygen sensor to determine catalyst efficiency, and the signal from the upstream sensor is a reference point. As such, failure of either the upstream or downstream oxygen sensor can cause code P0420 to set. The most common cause of the code, however, is a failed catalytic converter.

an oxygen sensor on a catalyst pipe of gasoline engine car close up

What is the p0420 code on a Nissan?

The P0420 code is a generic OBD code with a standard definition from the Society of Automotive Engineers (SAE). SAE refers to the code as “Catalyst System Efficiency Below Threshold (Bank 1)”. But on many newer Nissan vehicles, when using an OEM-level scan tool, the code may come up as “Three-Way Catalyst Malfunction.” In either scenario, the code indicates that your car’s onboard computer perceives a decline in the efficiency of the catalytic converter(s).

How do you test an O2 sensor for a P0420 code?

Most of the time, code P0420 indicates a faulty catalytic converter. There are, however, instances where a bad oxygen sensor can trigger the code.

mechanic conducting diagnostics tests on a vehicle

One way you can rule out the oxygen sensors is by forcing the air/fuel mixture rich and then lean. To force the system rich, carefully add propane to the engine’s air intake (and raise RPMs so the engine doesn’t stall) to enrich the air/fuel mixture. At the same time, monitor the sensors with a scan tool. The sensors should go rich (about 800 mV to 900 mV for a traditional zirconia oxygen sensor) in response to the propane.

You can then force the system lean by disconnecting a large vacuum hose. In this state, the sensors should go lean (around 200 mV-300 mV) for a traditional zirconia oxygen sensor).

If the oxygen sensors respond properly to both the rich and lean conditions, they’re working as they should, and the catalytic converter is likely the cause of the P0420 code.

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Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic.

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File Under : OBD-II Trouble CodesTagged With : catalytic-converter

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P0420 code definition:

Catalyst System Efficiency Below Threshold (Bank 1)

What the P0420 code means:

A P0420 code indicates a problem with the catalytic converter. The purpose of the catalytic converter is to break down harmful pollutants created during the combustion cycle. By using fine platinum and gold meshes to filter exhaust fumes, the catalytic converter is able to reduce the emissions expelled from the exhaust pipe.

The catalytic converter has two oxygen sensors. One oxygen sensor is positioned in front (upstream) of the catalytic converter and the other O2 sensor is positioned at the rear (downstream).

If the upstream oxygen sensor is working properly, its readings should fluctuate from when the car is at operating temperature and when running in a closed loop. If the downstream oxygen sensor is working properly, and there isn't an issue with the catalytic converter, its readings should remain steady.

When the oxygen sensors have similar readings to each other, it indicates that the catalytic converter is not working as intended. If the voltage of the downstream oxygen sensor decreases and begins to fluctuate like the upstream oxygen sensor, it means the oxygen levels are too high and the Powertrain Control Module (PCM) will store the P0420 trouble code and turn on the check engine light.

Common causes of the P0420 code?

  • Damaged muffler or leaks in the muffler.
  • Damaged exhaust manifold or leaks in the exhaust manifold.
  • Damaged exhaust pipe or exhaust pipe leaks.
  • A misfire in the engine.
  • Oil contamination in catalytic converter.
  • Faulty catalytic converter (most common).
  • Faulty engine coolant temperature sensor.
  • Faulty front oxygen sensor.
  • Faulty rear oxygen sensor.
  • Damaged oxygen sensor wiring.
  • Oxygen sensor wiring that is not properly connected.
  • Damaged oxygen sensor connectors
  • A leaking fuel injector.
  • High fuel pressure.
  • Use of the wrong kind of fuel (using leaded fuel instead of unleaded fuel)

4 Common symptoms of a P0420 code:

Though there are often no noticeable symptoms of a failure within the catalyst system, including drivability problems, there are 4 common indicators of the P0420 code:

1. Check Engine Light is on. Many things can trigger the check engine light to turn on. A mechanic will need to use a diagnostic tool to read the code and pinpoint the exact cause of the problem.

2. Lack of power after vehicle warms up. The engine will not run as well and may not provide enough power for acceleration.

3. Speed of vehicle may not exceed 30-40 mph. This may cause issues when driving along highways and freeways with higher speed limits, though you may not notice the symptom if you drive slower through mostly-residential areas.

4. Rotten egg smell coming from the exhaust pipe. This smell occurs from the incorrect amount of oxygen in the catalytic converter, which leads to excess sulfur in the fuel tank, creating the odor from the exhaust system.

How does a mechanic diagnose the P0420 code?

  • Uses an OBD-II scanner to retrieve trouble codes stored by the PCM.
  • Views the live data of the downstream (rear) oxygen sensor. The downstream oxygen sensor voltage reading should be steady. Make a determination as to whether the downstream (rear) oxygen sensor is working properly.
  • Diagnoses any other codes that could be causing the P0420 trouble code.
  • Repairs misfires, ignition problems, and/or fuel system problems if necessary.
  • Inspects the rear oxygen sensor for damage and/or excessive wear.
  • Test drives the vehicle while viewing the freeze frame data to determine whether or not the downstream (rear) oxygen sensor is working properly.
  • Checks for available updates of the PCM if the catalytic converter is faulty. After the catalytic converter is replaced, updates to the PCM will be required.

Common mistakes when diagnosing the P0420 code:

The most common mistake is replacing the oxygen sensors before completing the diagnostic process. If another component is causing the P0420 trouble code, replacing the oxygen sensors will not fix the problem.

How serious is the P0420 code?

It is common for a driver to experience no driveability problems when the P0420 trouble code is present. Other than the Check Engine Light being on, the symptoms of this trouble code may go unnoticed. However, if the vehicle is left in error without addressing the problem, serious damage could occur to other components.

Because there are no driveability symptoms associated with the P0420 trouble code, it is not considered serious or dangerous to the driver. However, if the code is not addressed in a timely manner, the catalytic converter could be seriously damaged. Because the catalytic converter is expensive to repair, it is vital the P0420 trouble code is diagnosed and repaired as soon as possible.

What repairs can fix the P0420 code?

  • Replace muffler or repair leaks in the muffler.
  • Replace exhaust manifold or repair leaks in the exhaust manifold
  • Replace exhaust pipe or repair exhaust pipe leaks
  • Replace catalytic converter (most common)
  • Replace engine coolant temperature sensor
  • Replace front or rear oxygen sensor
  • Repair or replace damaged wiring to oxygen sensor(s)
  • Repair or replace oxygen sensor connector(s)
  • Replace or repair fuel injector(s) that are leaking
  • Diagnose any repair any misfiring problems
  • Diagnose and repair any other related trouble codes that have been stored by the Power Control Module (PCM)

Keep in mind:

Problems with the ignition system, fuel system, air intake, and misfires can damage a catalytic converter if they are not addressed quickly. These components are most the common causes of the P0420 trouble code. When replacing a catalytic converter, is it a good idea to replace it with an OEM unit or an oxygen sensor replacement that is of high quality.

It is common for aftermarket oxygen sensors to fail, and when they do, the P0420 trouble code may return again. It is also a good idea to contact the manufacturer to see if your vehicle has a manufacturer warranty on parts that are related to emissions.

Need help with a P0420 code?

YourMechanic offers certified mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-844-668-2785.

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P0420 NISSAN Code - Catalyst System Efficiency Below Threshold Bank 1

Engine-Codes - Nissan - P0420 NISSAN

Repair Importance Level: 2/3

Repair Difficulty Level: 2/3  What is this?

What does this mean?

|P0420 NISSAN code possible causes

  • 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 is the P0420 NISSAN code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|What is the cost to diagnose the P0420 NISSAN code

Labor: 1.0

The cost to diagnose the P0420 NISSAN code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P0420 NISSAN 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.

|What are P0420 NISSAN code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|What is P0420 NISSAN code meaning?

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 NISSAN - Catalyst System Efficiency Below Threshold Bank 1 - Engine-Codes.com

|Need more information with the P0420 NISSAN code?

Need more information on how to fix the P0420 NISSAN code?
Get Access to Factory Service Manuals

|P0420 NISSAN code information for specific Nissan models

Repair Importance Level:2

 

1=Low 2=Medium 3=High What is this?

Repair Difficulty Level:2

 

1=Easy 2=Moderate 3=Hard What is this?

Browse Codes for Specific Model-Year

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