If the car oxygen sensor is broken and want to replace it yourself, how to operate it?

When it comes to automotive oxygen sensors, we usually know that these two things are locked in the exhaust pipe and are used to monitor the engine combustion exhaust gases. In other words, by detecting the combustion data of the engine and giving the computer a response, it is possible to determine whether the computer needs to be modified. The failure of the car oxygen sensor is solved by itself, with a tutorial - Woodpecker Master.

Today, I will tell you about the basic fault diagnosis methods and fault repair methods of automobile oxygen sensors. First, let's talk about how automotive oxygen sensors work. The oxygen sensor detects the oxygen content in the exhaust and converts it into an effect electrical signal for rare metals, generally volt-to-volt (ideally, volts).

In general, professional car repairers use an oscilloscope or professional equipment to read the corresponding data stream. We have absolutely no of these in the words of our own owners, so we try to remove these tools as much as possible to improve the feasibility.

Then the simplified tool is the light-emitting diode. The principle is to use the characteristics of light-emitting diodes to detect by themselves. When the signal output of the oxygen sensor is connected to the negative wire ground using the LEDs, if the oxygen sensor is operating normally, the output voltage of the oxygen sensor will fluctuate during all the rapidly rising cycles of the accelerator, reaching the critical voltage of the LEDs every volt.

At this point, the LED will light up. That's how we monitor.

The light-emitting diode is then tested with this principle. If it's not always bright, the sides can prove that the mixture is too thin. If the mixture is relatively thick, the LED will continue to turn on.

Of course, there are also cases where the oxygen sensor is damaged or always on or not. It should be properly handled according to the actual situation. This approach transforms from a clueless problem to a clear phenomenon and helps to propose a solution based on the actual diagnosis.

Of course, if the performance of the oxygen sensor is not good, we do not necessarily have to admit that the oxygen sensor is broken and must be replaced. The existing oxygen sensor can be removed and then heated with oxygen welding to make it white. Try to restore because oxygen sensors are expensive after all.

The reason for this oxygen sensor failure may be that the car owner does not pay attention to the quality of gasoline when adding gasoline, adding inferior gasoline, resulting in poisoning of the oxygen sensor, gray heavy metal substances attached to the housing, cutting off the contact between the exhaust gas and the oxygen sensor, resulting in abnormal measurements.

The structure of the automobile oxygen sensor is precise, do not replace it yourself, but go to a professional auto repair shop for repair and replacement.

You must first know how to repair it, and then buy a spare part and replace it yourself.

If the car oxygen sensor is broken, it is not recommended to replace it by yourself, and it is recommended to go to a professional repair point for repair. In addition to the need for special tools for replacement, it is more important that you find the cause of the failure of the oxygen sensor, which requires professional knowledge and experience. Even if you can replace it yourself through an online tutorial, if you don't know the cause, you won't be able to completely solve the problem.

Another point, the oxygen sensor is generally designed with two or more to achieve more accurate monitoring, under normal circumstances, the oxygen sensor can be used for about 300,000 kilometers, so do not ignore the cause of its damage.

Functions of the Oxygen Sensor:

The oxygen sensor is the most important sensor for the control of the combustion air-fuel ratio in the engine ECU. By monitoring the oxygen content in the exhaust, it sends a voltage signal to the ECU in a timely manner, and the ECU accurately adjusts the concentration of the gas mixture, that is, the amount of injected fuel, according to the change of voltage. In order to achieve the best working condition of the engine.

Most cars use a heated oxygen sensor, which is installed in the middle of the exhaust manifold, so you have to find it first, and generally the exhaust manifold is distributed in two ways, the front and back of the engine.

Can I replace the car oxygen sensor if it is broken? How does it work?

The oxygen sensor is divided into pre-oxygen and post-oxygen, of which the pre-oxygen is also called the air-fuel ratio sensor. It's not that it can't be disassembled and replaced, but the front and rear oxygen sensors must have special tools to disassemble, and the installation position of the front and rear oxygen is also relatively special, which is closely related to the engine layout. Transverse and longitudinal engines require different disassembly.

Equipment and tools are required to disassemble. Replacing it requires certain skills and equipment, and it is not recommended to do it yourself.

If you look closely, you will find that whether it is pre-oxygen or post-oxygen, they are installed on the exhaust pipe, and the exhaust pipe temperature is high. So they are all embedded in the exhaust pipe, and there is a ring around the front oxygen sensor like a heat insulation ring. At the same time, the wiring harness of the oxygen sensor is directly connected to its body, and there is no separate plug on the part side that can be removed (as shown in the picture above).

Only the lambda sensor has a connector on the harness side that can be disconnected. This means that special tools are required to disassemble the oxygen sensor. This special tool is a special style of sleeve, it has a notch on one side, this notch is convenient for us to put the oxygen sensor harness in, so as not to hurt the wiring harness when rotating.

The front oxygen sensor needs to be removed differently depending on the engine layout. The front oxygen is mounted on the exhaust manifold. However, due to engine layout limitations, transverse engines are placed at the front of the engine (mostly in naturally aspirated engines) and some at the rear of the engine (commonly associated with turbocharged engines).

In the case of longitudinal engines, the front oxygen is mounted on the side (6-cylinder V-engine) or rear (4-cylinder engine).

If the engine is transverse and the front oxygen sensor is in front, it is relatively easy to remove. Others require a lot of dismantling, especially turbocharged engines and side-mounted vehicles.

The rear oxygen sensor is much simpler, but it needs to lift the vehicle before it can be removed using special tools.

Precautions for disassembling the oxygen sensor.

The special sleeve must be attached to the root of the oxygen sensor before it can be forcefully loosened. Otherwise, it is easy to slip teeth, and it is very troublesome to slip teeth.

Pay attention to the wiring harness on the oxygen sensor when unscrewing, and the mounting sleeve is screwed. At the same time, do not turn to the end at once when screwing. In this way, the wiring harness is easily deformed or even broken. After unscrewing, adjust the rotation angle back and forth to protect the wiring harness.

The size of the special sleeve is also differentiated, and it is necessary to find out what size the oxygen sensor is before purchasing.

It is not difficult to disassemble the oxygen sensor, it is not difficult to say, it is not difficult to say. Unfamiliar, no tools and equipment. Or honestly go to the repair shop for a replacement.

After damage, you can buy accessories to replace them, but not everyone can replace them by themselves, you need to have a certain hands-on ability, it looks like a screw, it seems to be unscrewed and you can replace it, but you have to consider how to unscrew it, installed in the front and back of the exhaust pipe, the temperature of the exhaust pipe is very high, and the oxygen sensor will also be sintered with the exhaust pipe, so you should consider it clearly before changing, and it is not recommended to replace it yourself.

Models with simple structural layout can be replaced with their own tools. It is unlikely that the connecting wires are hidden. After the replacement, most cars need to use a decoder to remove the fault code, or check whether the repair result has indeed troubleshooted.

You can't replace it yourself, you should send it to a repair shop or a 4S shop for professional repair.

After the oxygen sensor on the car is damaged, you can buy accessories to replace it, but not everyone can replace it by yourself, and you need to have a certain amount of hands-on ability. The oxygen sensor looks like a screw, and it looks like it can be replaced with a new one by unscrewing it. But to consider how to unscrew it, the oxygen sensor is installed in the front and back of the exhaust pipe, the temperature of the exhaust pipe is very high, the oxygen sensor will also be sintered with the exhaust pipe, so it takes a certain amount of effort to disassemble, and a socket wrench is required, and even a screw loosening agent is required!

Therefore, it is necessary to think clearly before replacing, it is not recommended to replace it yourself without a certain hands-on ability, and it will be embarrassing if you can't remove the old one after buying the sensor! It's safer to leave professional matters to professionals. Replace the oxygen sensor to determine whether it is really damaged, do not rush to buy the sensor back, the oxygen sensor is damaged, the engine will report the fault code, and there will also be unstable idling, weak operation, exhaust odor, increased fuel consumption, emissions are not up to standard and other fault phenomena.

Whether it is damaged or not needs to be further detected, generally with fluctuation diagnostic equipment to read the fault code can be judged, according to the fault code to determine whether the oxygen sensor is damaged:

If it is determined that the oxygen sensor is damaged and there is some hands-on ability, then a new sensor can be purchased. There are many ways to buy, and online shopping is more convenient, but you should buy **.

There are two oxygen sensors on the car, one at the front of the exhaust pipe and one at the back of the exhaust pipe. The main function of the oxygen sensor is to detect the oxygen content and concentration in the exhaust gas, which is an indispensable sensor for the EFI engine.

The oxygen content in the exhaust gas is different, the output voltage value of the sensor is also different, the ECU can adjust the amount of fuel injection in real time after receiving the signal from the oxygen sensor, and the oxygen content in the exhaust gas is too high, so that the mixture concentration is low and the air-fuel ratio is high, and the ECU appropriately increases the amount of fuel injection according to the return signal so that the air-fuel ratio is always maintained at about 1, so that the purpose of saving fuel and reducing emission pollution can be achieved, and the oxygen sensor is also an indispensable sensor in closed-loop control.

I can't replace it myself. Because if the oxygen sensor is broken, and a special computer must be used to eliminate the fault code for the car.

You can buy accessories to replace, provided you know how to replace them. If you can't replace the accessories, it is recommended to go to the 4S shop for repair.

I think it is generally not recommended and should be replaced at a garage.

Is the oxygen sensor broken, does it affect normal driving?

You can go to the repair shop to replace it, and the maintenance personnel in the repair shop will replace it with a new oxygen sensor.

The car oxygen sensor is installed on the exhaust branch, which is also divided into front and rear. The front-mounted type is installed behind the water tank, and you can see it when you open the hood, and the surrounding space is relatively spacious for maintenance and operation. The rear-mounted type is installed between the engine and the firewall, this position is relatively hidden, inconvenient for maintenance and operation, you have to ask a professional to change!

First of all, we should buy a new oxygen sensor, and then go to a repair shop or a 4S shop to replace it, so that it is more stable and more secure.

You still have to go to the 4S store to find a professional person to help you change, it is very dangerous to change it yourself, and if you don't change it well, it may also cause very serious consequences.

Whether or not an oxygen sensor can be replaced if it is broken depends on the individual's ability to do it. People with strong hands-on skills can try to replace them normally. In general, I recommend having a maintenance person replace it.

The first thing to pay attention to when replacing an oxygen sensor is not to burn. The oxygen sensor is mounted on the exhaust system of the engine. The temperature in this area is very high, so be sure to replace the oxygen sensor after the engine temperature has dropped.

Gently feel the threads of the oxygen sensor loosen and unscrew it firmly in one go.

Can't relax slowly, the teeth are very slippery, after being loosened all at once, the feeding sensor can be easily decomposed, after loosening, it must be considered whether to decompose, generally speaking, the oxygen sensor is not easy to damage, and the oxygen sensor can be cleaned with oxygen sensor cleaning agent. Please clean and install it. According to the oxygen sensor on the car, there are things that have to be lifted to see the car.

First of all, there are no special tools for disassembly. Moreover, because this sensor has been hot for a long time, it rusts and it is very difficult to remove the screws.

Secondly, there is no special tool to lift the roof, otherwise, the wires may become tangled when disassembled. However, it is not simple to use the oxygen sensor for a long time, so be careful not to burn it when disintegrating, and think carefully before exchanging. Without some level of hands-on ability, I don't recommend replacing it yourself.

It would be embarrassing if you couldn't take off the old sensor you bought! It is safer to leave professional things to professional people. Check if the oxygen sensor is really damaged, don't buy it rashly.

When the oxygen sensor is damaged, the engine will report the fault**, and at the same time there are several faults such as unstable idling, weak operation, exhaust gas odor, increased fuel consumption, and substandard emissions. The oxygen sensor is dark under normal conditions and has no impurities on the surface. If the surface of the oxygen sensor is covered with build-up such as black or gray, the oxygen sensor may be contaminated with oil, causing the vehicle to burn oil.

Oxygen sensors detect the oxygen content in the exhaust gases and convert it into a valid electrical signal for rare metals, which is read by car maintenance personnel using an oscilloscope or specialized equipment.

When the signal output of the oxygen sensor is connected to the ground of the negative line with the LEDs, the output voltage of the oxygen sensor fluctuates during the rapid rise cycles of all accelerators, reaching the critical voltage of the LEDs per volt. The LED lights are on. Our Monitoring Principles.

If it is not always bright, the sides can prove that the mixture is too thin. If the mixture is relatively thick, the LED will continue to illuminate. There are also cases where the oxygen sensor is damaged or always on or off.

To be properly handled on a case-by-case basis, the technology transforms from a problem with no clues to a clear phenomenon and helps to propose solutions based on actual diagnoses. The oxygen sensor is a key feedback sensor in the EFI engine control system. In the event of a failure, there will be no feedback control of the air/fuel ratio, which will increase engine fuel consumption and exhaust pollution.

The engine is also prone to failures such as unstable idle speed and difficult starting. The main reason for the failure of the oxygen sensor is the use of low-quality fuel oil, and the high carbon deposition in the combustion chamber and intake manifold.

When replacing the oxygen sensor, it is also recommended to remove carbon deposits from the air intake system. Replacement requires special tools, and the cause of the oxygen sensor failure must be found, which requires expertise and experience. Even if you can replace yourself with a tutorial, if you don't know the cause, you won't be able to completely solve the problem.

Two or more oxygen sensors are used for more accurate monitoring. Under normal conditions, the oxygen sensor can be used for about 300,000 kilometers.