What are the dangers of a broken lambda sensor in a car?

The most common failure of an oxygen sensor is failure, and there are two main reasons for this:

The first is clogged with carbon particles, at which point the signal voltage of the oxygen sensor will be too high, and the engine computer will therefore issue instructions to reduce the amount of fuel injected, making the mixture too thin.

The second is that dust and oil block the through hole between the oxygen sensor and the atmosphere, at this time, the signal voltage of the oxygen sensor will be low, and the engine voltage will indicate that the injector will inject more fuel, causing the mixture to be too thick.

The oxygen sensor is an important component of the electronically controlled fuel injection engine, and if it fails, it will not only exceed the emission standard, but also worsen the operating condition of the engine.

The electronic fuel injection system cannot obtain the information of oxygen concentration in the exhaust pipe, and then cannot feedback and control the air-fuel ratio, which will increase the fuel consumption and exhaust pollution of the engine, and the engine will have unstable idling, lack of fire, surge and other fault phenomena.

Oxygen sensor: the function is to determine whether there is excess oxygen in the exhaust of the engine after combustion, that is, the oxygen content, and convert the oxygen content into a voltage signal and transmit it to the engine computer, so that the engine can realize the closed-loop control with the goal of excess air factor; Ensure that the three-way catalytic converter has the maximum conversion efficiency for the three pollutants in the exhaust gas, namely hydrocarbon (HC), carbon monoxide (CO) and nitrogen oxide (NOX), and maximize the conversion and purification of the emitted pollutants.

Fault handling: 1. Poisoning fault Oxygen sensor poisoning is a kind of fault that often occurs and is difficult to prevent, especially for cars that often use leaded gasoline, even if it is a new oxygen sensor, it can only work for thousands of kilometers.

2. The ceramic of the ceramic fragmentation oxygen sensor is hard and brittle, and it may be broken and invalid by hitting it with a hard object or blowing it with a strong air flow. Therefore, it is necessary to be especially careful when dealing with it, and replace it in time if problems are found.

3. The resistance wire of the heater is burned out, and for the heating oxygen sensor, if the heater resistance wire is ablated, it is difficult to make the sensor reach the normal working temperature and lose its effect.

4. The internal circuit of the deoxidation sensor is disconnected.

If there is no alarm, don't care about it, white smoke and dripping water are normal phenomena, indicating that the engine is in good condition, and you can wash the throttle or check the lower mat when idling and shaking.

Once the oxygen sensor and its connection line fail, it will not only exceed the emission standard, but also worsen the engine condition, resulting in the vehicle idling off, engine inaccuracy, power loss and other symptoms.

The function of oxygen sensor is to control automobile exhaust emissions, reduce automobile environmental pollution, and improve the fuel combustion quality of automobile engine.

Automotive oxygen sensor is a key sensing component in the EFI engine control system, which is a key component to control automobile exhaust emissions, reduce environmental pollution of automobiles, and improve the fuel combustion quality of automobile engines.

The oxygen sensor is a measuring element that uses ceramic sensing elements to measure the oxygen potential in various heating furnaces or exhaust pipes, calculates the corresponding oxygen concentration by the principle of chemical equilibrium, monitors and controls the combustion air-fuel ratio in the furnace, and ensures that the product quality and exhaust emissions meet the standards.

Once the oxygen sensor fails, the computer of the electronic fuel injection system can not get the information of the oxygen concentration in the exhaust pipe, so it can not feedback and control the air-fuel ratio, which will increase the engine fuel consumption and exhaust pollution, and the engine will have unstable idling, lack of fire, surge and other fault phenomena. Therefore, it is necessary to troubleshoot or replace it in a timely manner.

1.Poisoning malfunction.

Oxygen sensor poisoning is a frequent and difficult failure to prevent, especially in cars that often use leaded gasoline, and even a new oxygen sensor can only work for a few thousand kilometers. If there is only a mild case of lead poisoning, a tank of lead-free gasoline can remove the lead from the surface of the oxygen sensor and restore it to normal operation. However, often due to the high exhaust temperature, the lead invades its interior, hindering the diffusion of oxygen ions, making the oxygen sensor fail, and then it can only be replaced.

In addition, silicon poisoning of oxygen sensors is also common. Generally speaking, the silica produced after the combustion of the silicon compounds contained in gasoline and lubricating oil, and the silicone gas emitted by the improper use of the silicone rubber gasket will make the oxygen sensor fail, so it is necessary to use the best fuel and lubricating oil.

When repairing, the rubber gasket should be correctly selected and installed, and the sensor should not be coated with solvents and anti-sticking agents other than those specified by the manufacturer, etc., due to poor engine combustion, carbon deposits are formed on the surface of the oxygen sensor, or deposits such as oil or dust are entered inside the oxygen sensor, which will hinder or block the external air from entering the oxygen sensor, so that the signal output of the oxygen sensor is inaccurate, and the ECU cannot correct the air-fuel ratio in time.

Carbon deposition is mainly manifested in the increase in fuel consumption and a significant increase in emission concentration. At this point, if the sediment is removed, normal work will be restored.

2.Ceramic chipping.

The ceramic of the oxygen sensor is hard and brittle, and striking with a hard object or blowing it with a strong air stream can cause it to shatter and fail. Therefore, it is necessary to be especially careful when dealing with it, and replace it in time if problems are found.

3.Wire blocking burns.

The heater resistance wire is burned out, and if the heater resistance wire is ablated for the heated oxygen sensor, it is difficult to make the sensor reach the normal operating temperature and lose its effect.

4.The line is disconnected.

The internal wiring of the oxygen sensor is disconnected.

There are basically two basic ways to control the air-fuel ratio of piston automobile internal combustion engines, that is, to control the fuel supply while supplying air to the engine

Use a carburetor:

Conventional piston internal combustion engines use carburetors to control the air/fuel ratio. It is a mechanical device that mixes a certain percentage of gasoline with air under the action of a vacuum created by the operation of an engine. The carburetor is a delicate mechanical device that uses the kinetic energy of the inhaled air stream to atomize gasoline.

Carburetors have been used for a long time, and the design and manufacture can be said to have tended to perfection. But it has a fundamental flaw, that is, the carburetor is designed and manufactured according to the data under experimental conditions. In layman's terms, it is to make a carburetor, which can achieve an ideal air-fuel ratio after verification, and install it on the car, as for whether the actual air-fuel ratio in use is appropriate, the carburetor does not care.

However, in recent years, there have also been carburetor applications that use oxygen sensors to collect data, which affects the working state to a certain extent.

The use of electronic control devices, the use of electronic control devices, to control the engine fuel supply process (EFI engine), can fundamentally solve the defects of the carburetor.

For EFI engines, the data collected by the oxygen sensor is the basic basis for controlling the fuel intake (controlling the air-fuel ratio). The basic control process is that under the same circumstances, more oil will be given if the oxygen content in the exhaust gas is high, and less oil will be given when the oxygen content is low. It can be seen that for EFI trucks, oxygen sensors play a very important role.

If the oxygen sensor of a gasoline car is broken, it will cost fuel to drive. Oxygen sensors are an essential element in engines that use three-way catalytic converters to reduce exhaust pollution. Because once the air-fuel ratio of the mixture deviates from the theoretical air-fuel ratio, the purification ability of the three-way catalyst for Co, HC and NOx will decrease sharply, so an oxygen sensor is installed in the exhaust pipe to detect the concentration of oxygen in the exhaust gas, and send a feedback signal to the ECU, and then the ECU controls the increase or decrease of the fuel injection volume of the injector, so as to control the air-fuel ratio of the mixture near the theoretical value.

Function: In order to obtain a high exhaust purification rate and reduce the composition of (CO) carbon monoxide, (HC) hydrocarbons and (NOX) nitrogen oxides in the exhaust, the EFI truck must use a three-way catalytic converter. However, in order to use the three-way catalytic converter effectively, the air-fuel ratio must be precisely controlled so that it is always close to the theoretical air-fuel ratio.

The catalytic converter is usually installed between the exhaust manifold and the muffler. The oxygen sensor has the characteristic that the voltage it outputs abruptly around the theoretical air-fuel ratio (:1).

This characteristic is used to detect the concentration of oxygen in the exhaust gas and feedback to a computer to control the air/fuel ratio. When the actual air-fuel ratio becomes high, the concentration of oxygen in the exhaust gas increases, and the oxygen sensor notifies the ECU of the state of the dilute mixture (small electromotive force: O volts).

When the air-fuel ratio is lower than the theoretical air-fuel ratio, the concentration of oxygen in the exhaust gas decreases, and the status of the oxygen sensor (large EMF: 1 volt) notifies the (ECU) computer.

Hello. The function of the rear oxygen sensor is to detect the working state of the front oxygen. Detect the working state of the three-way catalysis, so when it is damaged, it cannot transmit this signal to the computer, and the fuel injection cannot be accurately controlled, and the oil will be wasted.

Some models will cause the car to be frustrated, slow to accelerate, and unable to run.

There are 2 oxygen sensors, one before and one behind, and after the front oxygen sensor fails, the accurate oxygen concentration cannot be read. Naturally, it is impossible to accurately stabilize the air-fuel ratio. The air-fuel ratio is out of tune, and of course the engine cannot function properly.

There will be an impact. If the latter one is broken, whether your three-way catalytic converter is good or bad, the car can't tell.

The impact of a broken oxygen sensor on the car:

1.If the oxygen sensor is damaged, it will cause the ECU to control the injection volume inaccurately, and in severe cases, it may cause serious carbon deposits in the engine, especially in the injectors.

2.Damaged oxygen sensors will cause the pressure of the injector to be too high, and over time, it will cause the injector to drip and damage.

3.The work of the three-way catalytic converter is affected, and after the oxygen sensor is damaged, the concentration of the combustible mixture is likely to be large, and the amount of exhaust gas increases at this time, increasing the working pressure of the three-way catalytic converter, and eventually causing the three-way catalytic converter to be damaged.

Precautions for using an oxygen sensor:

1. Try to drive as smoothly as possible. Unless it is an emergency or bad road conditions, it is necessary to minimize the violent shaking and impact of the car body, and avoid the bottom of the car chassis (especially near the rear row). Because there are ceramic sensitive components in the oxygen sensor, these components can be damaged by severe shaking or impact.

2. Pay attention to the sensor wire wire. When overhauling the bridge orange vehicle, it is necessary to pay attention to the line and try not to pull excessively. Like other electronic devices, if the conductor of the sensor is affected, resulting in an unreliable wire connection, it will destroy the field and affect the normal operation of the oxygen sensor.

3. Pay attention to the rear row when washing the car after the engine is turned off. Because the exhaust pipe of the tail exhaust is very hot when the car is in use, and then if the tail exhaust is accidentally washed when washing the car, then the exhaust pipe is violently cooled by external influences, which may cause the ceramic sensitive element of the oxygen sensor to burst, and then the oxygen sensor will "strike".