Dongfeng Honda CRV fault code is P0420 rear cylinder row catalyst system efficiency is lower than th

P0420 is a catalyst system efficiency below the threshold.

First row): The system is through the comparison of the data of the two oxygen sensors before and after the catalytic converter, if the comparison between the back and the front is found to be no improvement, below a certain set value, the P0420 will be set and the fault lamp will be lit, and now the three-way catalytic converter can only be replaced.

in order to make the fault lamp no longer lit.

It is useless to wash the three-way catalytic converter, the catalyst inside has failed, it has no effect on the engine, and it is only useful for improving exhaust gas and environmental emissions.

P0420 Catalyst.

The purification efficiency of the system is too low, that is to say, the three-way catalysis is not good for the purification of the exhaust gas, which generally refers to the mixture being too concentrated or the oxygen sensor being damaged.

Honda CRV P0420 means that the exhaust pipe three-way catalytic converter is faulty and damaged.

There are 3 ways to quickly resolve the P0420 fault.

The first is: replace the original three-way catalytic converter of the vehicle, remember not to change the auxiliary factory, the auxiliary factory will not be long before the lights will be on.

The second is to install a part like this part of the TDTAS faulty lamp to repair the data to remove the P0420 faulty lamp.

The third way is: use the car computer to enter the engine ECU background and turn off this P0420 fault (some cars can, some cars can't).

Of course, there are many other ways to solve it, if you want to solve it quickly, I recommend these 3, I hope it can help you.

Is the CRV a three-way catalytic converter that has an oxygen sensor before and after, if there is, the three-way catalytic converter is wasted, it means.

P0420 is the catalyst system efficiency below the threshold (first row): this system compares the data of two oxygen sensors before and after the catalyst. If there is still no improvement after the previous comparison, the following setting values will set the P0420 and light up the fault lamp.

Only three-way catalytic converters can now be replaced. In order to stop the fault light from illuminating.

The pre-oxygen sensor is the same as the posterior oxygen sensor, and B1 should be the posterior oxygen. The pre-oxygen detects the oxygen content in the exhaust gas and notifies the ECU, which adjusts the fuel injection volume to achieve the best air-fuel ratio. Normally, the voltage oscillates between volts.

After mild pollution, the voltage oscillates between volts and pure hail, and for severe pollution, it oscillates between volts.

The role of post-oxygen is mainly to detect whether the catalytic converter is working normally. First of all, it is necessary to rule out whether the oxygen sensor is broken, and in the case of no damage, the voltage of the pre-oxygen detection is the same as the voltage of the post-oxygen detection, which means that the three-dimensional catalysis is broken.

Expand to do celery fan information:

A hole is punched in the appropriate position of the exhaust pipe at the front end of the catalytic converter, a pressure gauge is connected, the engine is started, and the exhaust back pressure is measured at idle speed and 2500r min, respectively, if the exhaust back pressure does not exceed the limit specified by the engine, it indicates that the catalyst carrier is not blocked.

If the exhaust back pressure exceeds the limit specified by the engine, the exhaust system at the rear end of the catalytic converter needs to be removed from the front and front, and the above test is repeated, if the catalytic converter is blocked, the exhaust back pressure will still exceed the limit specified by the engine.

If the exhaust back pressure drops, there is a problem with the exhaust system downstream of the muffler or catalytic converter, and the broken catalyst carrier is trapped in the downstream exhaust system, so it is necessary to first perform a visual inspection to confirm that the catalyst carrier is intact. Faulty exhaust pipes, mufflers and catalytic converters can also be judged by measuring the pressure loss before and after them.

There are three reasons for this, one is that the catalyst itself is not good (the general catalyst has a warranty of 100,000 kilometers, and it is directly replaced if it is broken), and the other is that the exhaust gas discharged is too thick (this involves a lot of problems, the oxygen sensor will be broken, carbon deposition, and burning engine oil will also be like this, and it will generally be known if you have to analyze it), and there is also a situation that your car has two catalysts at the front and rear ends, The purpose is to make the exhaust combustion of the cold car start or turbocharged car more thorough and more effective, the working principle is that the middle section will be burned again, if there is a problem in the middle, then it will also affect the purification efficiency, above, if you have any questions, please ask

Did the landlord solve it, I had the same problem with my car.

Summary. If this fault occurs**, it means that the three-way catalytic converter of your engine is aging, and in this case, if you want to solve it, then you should consider replacing the three-way catalytic converter. However, before replacing the three-way catalytic converter, it is still necessary to read whether the signal of the front and rear oxygen sensors is normal through the data stream, and it is recommended that you clean the three-way catalytic converter first, if there is no effect after cleaning, then consider replacing it.

The efficiency of the Honda car fault code Q0420 rear cylinder train de-catalyst system is lower than the limit value B1. What is the reason?

Hello, don't click to end, I'm textual to give you the full answer, 2-3 minutes.

If this fault occurs**, it means that your engine's three-dimensional book empty yuan Zisong urges the blind converter to age, like this case, if you want to solve it, then you must consider replacing the three-way catalytic converter. However, before replacing the three-way catalytic converter, it is still necessary to read whether the signal of the front and rear oxygen sensors is normal through the data stream, and it is recommended that you clean the three-way catalytic converter first, if there is no effect after cleaning, then consider replacing it.

Summary. Hello, I have seen your inquiry, please wait for a moment and answer it for you immediately.

The efficiency of the Honda car fault code Q0420 rear cylinder train de-catalyst system is lower than the limit value B1. What is the reason?

Hello, I have seen your inquiry, please wait for a moment and answer it for you immediately.

Hello car owner, according to your description, this problem occurs because the reaction efficiency of the three-way catalytic converter is low, and it is recommended to clean the three-way catalytic converter first.

The 4S store just changed the three yuan.

Just 4s changed the ternary or burst this fault code bright.

Now, no.

What can't you look at now?

Three-way catalytic converter.

Looking at the fault, it is obvious that the reaction efficiency is low.

The ternary that I just changed in the 4S store has not run 2000 kilometers, could it be that the back itch sensor is broken.

Look at the fault** is not an oxygen sensor problem.

p0420.

The efficiency of the catalyst system is lower than the threshold (first row): the system is through the comparison of the data of the two oxygen sensors before and after the catalytic converter, if the comparison between the latter and the previous one finds that there is no improvement, it is lower than a certain set value, the P0420 will be set and the fault lamp will be lit, and now only by replacing the three-way catalytic converter can the fault lamp no longer be lit.

It is useless to wash the three-way catalytic converter, the catalyst in it has failed, it is more expensive, it has no effect on the engine, and it is only useful for improving exhaust gas and environmental emissions.

Usually the three-way catalytic converter is faulty. However, before replacing, check the exhaust manifold, whether the exhaust pipe is leaking, and whether the oxygen sensor is faulty.

Go to the 4S store and ask for it.