The catalytic converter is essential in the exhaust system. Its failure would constitute the release of harmful gases into the atmosphere and the failure of emission tests. The error code P0420 shows that your vehicle’s PCM has detected problems with the exhaust system.
As such, the cat con has failed to make toxic exhaust gases less harmful to the environment. Remember that the safety process is functional with the help of the PGMs mesh filters.
Additionally, the catalytic converter has 2 oxygen sensors. One is in the front (upstream), and the other is at the rear (downstream) of the catalytic converter. When the upstream sensor works, it should be able to send a fluctuating signal at operational temperature when the catalytic converter is running in a closed loop. On the other hand, the downstream sensor will also help keep the readings steady.
In a situation where the upstream and downstream sensors have similar readings, it indicates that the catalytic converter is not properly functioning. To this effect, the voltage of the downstream oxygen sensor would decrease and fluctuate like the upstream sensor.
The oxygen levels, however, become too high as the PCM stores up the error code. Thus, the malfunctioning of these sensors will illuminate the check engine light.
This article will answer these typical queries ranging from; can I clear a P0420 code, how do I fix error P0421, will P0420 fail emissions, can a vacuum leak cause P0420, P0420 code catalytic converter cleaner, can bad o2 sensor ruin catalytic converter, and more.
Be patient; let’s get started!
Can I Clear A P0420 Code?
The simple answer is yes, and at the same time, no! To this end, a good knowledge of the cause and how experienced you are will go a long way to clear a P0420 code. Depending on the cause, diagnosis and fixing might seem simple or complex. For instance, it is easier to clear the P0420 code if it is a faulty oxygen sensor and wrong wiring or connectors that triggers the code.
On the contrary, if other issues arise other than the above, you may need help to clear the code. It would be best if you contact the services of a professional who will diagnose and proffer quicker and better solutions to the problems.
Let’s quickly look at some other common causes of a P0420 error code;
- High fuel (gasoline or diesel) pressure.
- Fuel injector leakage
- Lousy oxygen coolant temperature sensor
- A damaged muffler or leaks in the exhaust muffler
- Debris or oil contamination in the catalytic converter
- Faulty catalytic converter
- Broken exhaust pipe or pipe leakage
- Using the wrong type of fuel
- Leaks or damage to the exhaust manifold
So let now move on to the p0420 code fix permanent easy cheap
p0420 code fix permanent easy cheap
P0420 is a known code in the automobile industry and can be very annoying to fix. However, a proper diagnosis could be vital for a successful fix if you are wondering how to fix it. The first step is to get the correct diagnosis to determine the related causes of the malfunctioning catalytic converter.
Step-by-Step Guide to Resolving Error P0420
Identify the source of a vacuum leak: Check for vacuum leaks in your engine by listening for any changes to its idle and listening for hissing sounds. If you hear these, then you have located the source of the vacuum leak.
Check for plastic gaskets.
If your engine appears to be running normally, but you still receive the P0420 error code, it could be indicative of an issue with one or more plastic gaskets, such as an intake gasket or throttle body gasket. Over time these seals may become worn or damaged, allowing unmetered air into the system and leading to the error code.
Determine Which Gaskets Need Replacement.
If you believe the issue lies with your gaskets, you’ll need to determine which ones require replacing. Check for cracks or wear and tear on them, plus double-check that the vendor code on your vehicle matches up with what type of gaskets should be installed.
Once you’ve identified which gaskets need replacing, please go ahead and replace them according to the instructions and using the right tools. Be sure to read all instructions thoroughly for safe and successful completion.
Avoid Replacing Catalytic Converters.
Don’t attempt to fix the P0420 error code by replacing catalytic converters or altering your exhaust system. Doing so could cause more issues and be costly in the long run.
How Do I Fix Error P0421?
Check out things you would do to fix error P0420;
- Replace Bank 1 catalytic converter
- Replace the air-fuel sensors
- Replace faulty oxygen sensors
- Clean or replace faulty spark plugs
- Fix or replace the ignition coil (in necessary)
When the above code goes through diagnosis, it would be best to fix it as soon as possible to avoid internal engine damage. Although, you could spend about $75 to $150 to diagnose the cause of the P0420 code. Check out the additional fees for parts below;
- Catalytic converter $400 to $2400, depending on the vehicle brand.
- Air-fuel sensor $200 to $300
- Spark plugs are $40 to $640 (you might remove the intake manifold)
- Ignition coil $230 to $640 (you might take away the intake manifold)
Will P0420 Fail Emissions?
Of course, it will. This code will lead to failed emission tests, especially in states or countries where such test is annual. Not only does P0420 fail emissions, but it will also cause further damage to other parts of your vehicle. As much as the P0420 error code doesn’t cause acceleration issues, you might overlook it. But such a habit isn’t good for the well-being of your vehicle.
Read on to learn more!
Can A Vacuum Leak Cause P0420?
Yes, a vacuum leak can cause a P0420 code in the PCM. The vacuum leak, especially the muffler manifold leaks, causes the catalytic converter to fail, which triggers the error code and the check engine light.
P0420 Code Catalytic Converter Cleaner?
Suppose the PCM triggers P0420; a high fume is getting out of the engine. Thus, it would require a high engine flush with a catalytic converter cleaner.
The catalytic converter cleaner is special to remove soot and carbon deposits in the exhaust system. It is mainly in the catalyst, EGR valve, turbocharger, and lambda sensors. With a regular application, it would provide vital protection against further contaminations. Hence, the catalytic converter supports compliance with the emission limits.
I recommend using catalytic converter cleaners for petrol, diesel, and hybrid vehicles to help eliminate P0420 code issues.
Can Bad O2 Sensor Ruin Catalytic Converter?
The simple answer is Yes! To this, the function of the oxygen sensor is to monitor and moderate the oxygen level in the exhaust system.
However, if it (upstream and downstream sensors) fails to regulate and relate the correct information to your vehicle’s computer; then it would cause the catalytic converter to malfunction.
Additionally, a bad oxygen sensor is one of the common causes why catalytic converters fail.
Can Catalytic Converter Cleaner Fix P0420?
Of course, yes! The catalytic converter cleaner can fix the P0420 code, especially if cat con is the culprit.
Remember that the function of the cat con cleaners is to remove any dirt or debris which could have clogged the catalytic converter. I recommend the use of a cat con cleaner known as Cataclean.
Using a cleaner like Cataclean is practical and straightforward, as you pour a complete catalytic converter cleaner into the gas tank.
After that, you might clear the P0420 code. And also, drive your car for about 30 minutes at 45 mph or more.
However, this should help to fix the faulty catalytic converter and the P0420 code.
How Often To Use Catalytic Converter Cleaner?
The frequency of using any catalytic converter cleaner depends on the product instructions. However, it would help if you used the catalytic converter cleaner at most 4 times annually.
Such an application should be meted at a similar interval to prevent mismanagement of such a product.
Remember, it is safe to use cat con cleaners under any circumstance, as long as you follow the manufacturer’s guide precisely.
Conclusion
Finally, issues with the fuel, ignition, misfires, and air intake would damage the catalytic converter. As a result, these issues trigger the P0420 trouble code. Unfortunately, no vehicle component can last forever.
Before you attempt to fix or replace any components of your vehicle due to the P0420 code, it is wise to get a proper diagnosis of the specific cause part. Then use an OEM unit or product to do the replacement.
I recommend you contact a professional whenever any issue of trouble codes emanates from the ECM/PCM.
Do well to share this insightful guide with others!
Reference
- P0420 OBD-II Trouble code
- P0420 Code: An In-Depth Analysis
- P0420 Code – Meaning, Causes, And Symptoms
Uchenna is a Radiographer and Auto parts mechanic who recently got his automotive diploma as an auto repair technician, and since then, has worked on fixing various car problems.
Working as just a radiographer, Uchenna didn’t just get all the fulfillment he desired, because he truly loved doing things tilted toward cars. As a kid, he would take apart his toy cars to see how they worked and would spend hours tinkering with his bike.
So, in 2017 he made the tough decision to become an auto mechanic. He threw himself into his studies and now loves every aspect of what he does.
He gets to work with his hands, solving problems and bringing cars back to life, and sharing his knowledge and easy quick-fix guide online are all part of what makes him feel fulfilled.
