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Cause of the P04420 Toyota Code

All About P0420:The price for a generic Toyota radiator is less than ten dollars. The price for a certified Toyota radiator is around sixty-five dollars. If you do some research on the internet, you will be able to find exactly what you are looking for.

There are many sites that list what car parts they have and where they are located. Some of them have more information, and some of them are just links to dealers. When you research online, it is best to do a thorough search on each site.

If you get a P0420 code, it means the catalytic converter on your car is not working properly. A P0420 code is a generic OBD-II code that can be triggered by many different things, such as a bad camshaft position sensor, ignition control module, or airflow meter.

The most common cause of a P0420 is a faulty catalytic converter. The catalytic converter is responsible for reducing emissions in your car, so it’s not something you want to be broken!

Main Reasons 

One of the reasons this engine blocks up is because the catalytic converter in the engine is faulty or has failed.

If you notice a leak under your hood, or you smell something metallic, or you have a wet floor when you go driving, it may be time for an automotive repair specialist to check out your vehicle.

The best way to determine if it is time for a replacement or a repair is to research the P0420 Toyota possible causes of failure.

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and front o2 sensor changes from high to low the front o2 sensor will change from low to high, which will decrease the switching frequency of the rear o2 sensor.

This symptom indicates a possible failed catalytic converter and needs to be replaced by a qualified technician. If the catalytic converter fails, the vehicle cannot be driven until it is repaired, and it cannot start at all, therefore the diagnosis of a faulty catalytic converter is necessary.

When the check engine light comes on, you should first take your car to a mechanic and have them run a diagnostic test to see what is causing it.

Possible Causes

The third possible cause of a failing emission sensor is a leaking intake air filter. An intake air filter can become clogged with deposits, and when these deposits cool, they pull the oxygen sensor’s switching frequency off of its normal frequency and cause the sensor to fail. As an intake air filter is usually not replaced by the car dealership when a failure occurs, a muffler repair is necessary. In most cases, an OEM muffler can be replaced by a professional muffler replacement shop, however, if it cannot be opened and repaired, a new one should be purchased.

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The fourth possible cause of a failing induction is a defective fuel injector. A fuel injector is part of the exhaust system that adds horsepower to a vehicle. When properly installed and maintained, a fuel injector ensures that the horsepower produced by the engine is at its proper combustion efficiency. If either the fuel injector, spark plugs, or both are faulty, the engine may not operate at its optimal capacity. In most cases, a fuel injector replacement is necessary.


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The final reason why a Toyota Prius may fail has to do with the three-way catalytic converter. This part functions as a shut-off switch for the engine. It shuts off the engine when there is too much oxygen storage capacity in the engine.

If either the catalytic converter bank 1, the timing cover, or both are faulty, then the engine will not be able to function correctly.

The Fifth Possible Cause

The fifth possible cause of this error message is a dirty air filter. This is one of the more difficult problems to repair, as a dirty air filter can be very difficult to identify. If this problem is not fixed, the error on the PCM codes could continue to occur, which could eventually require major replacement. The possible causes of the PCM code p0420 are a dirty air filter, a clogged air filter, or a damaged air filter.


The sixth possible cause of the p0420 Toyota code is damage to one or more areas of the Toyota engine. This would be one of the most damaging problems that could occur if your engine did not have enough lubrication. For starters, the engine could malfunction completely. Second, the vehicle could experience excessive and sudden pressure, which could lead to the engine overheating. Finally, there could be an obstruction in the air cooling system. This is the main cause of the “rings” that appear on your auto diagnostic screen.

Another Possible Cause

Another possible cause of this problem is a faulty fuel injector fluid. This problem is a result of fuel being lost from the injector cavities. When this occurs, the amount of fuel that flows into the combustion chamber is reduced. As a result, the efficiency of the fuel-burning process is affected.

If the problem is not fixed as soon as possible, the resulting symptoms will include acceleration problems. A loss in top speed, and an inability to properly shift gears.


The seventh cause of the p04420 Toyota code is a result of improper ignition timing. The reason why this occurs is because of the engine speed regulator returning to its closed position after ignition. If this ever happens to you, it means that your car is suffering from a serious problem.

In order to ensure that this problem does not occur again. You should always make sure that the fuel tank and the carburetor are free of any debris or foreign objects. Also, it is recommended that you check the fuel lines and hoses for leaks.

I hope you got enough information about the P0420 Code.

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