Is the idle instability related to the failure of the lambda sensor that often lights up from time t

Hello, dear, the car master will serve you, attentively, carefully and attentively answer for you, find the corresponding problem solution and solution for you, and will definitely provide you with a satisfactory answer! We hope you find this answer helpful. Hello, there is a certain relationship between the idle speed of the vehicle and the oxygen sensor.

First. If the relevant signal fed back by the oxygen sensor is not accurate enough, the engine's computer will control the amount of fuel injected, and this situation will easily lead to an increase in idle speed. Second, this kind of emotional luck can be used to read the corresponding fault ** with the hall elimination computer, if there is a fault code of the oxygen sensor, it is necessary to replace the damaged oxygen sensor quietly.

Engine Fault Light Caused by Oxygen Sensor OnEngine Fault Light Caused by Oxygen Sensor What Is The Cause Of Oxygen Sensor Fault Indication Engine Fault Light? Causes of Oxygen Sensor Failure Indication Engine Failure Light:1

The electronically controlled idle control valve can ensure the correct idle speed of the EFI engine. The electronic control unit regulates the idle control valve based on engine speed, temperature, throttle switch and air conditioning signals. 2.

When the idle speed is lower than the set speed value, the computer commands the idle control valve to open the intake bypass or directly or indirectly increase the throttle opening, increase the air intake, and increase the engine idle speed; 3.When the idle speed is higher than the set speed value, the computer instructs the idle control valve to close the intake bypass channel to minimize air intake and reduce engine speed. Due to oil contamination and carbon build-up, the idle control valve is sluggish or clogged, the throttle valve is not closed properly, etc.

The ECU is unable to properly regulate the engine idle speed, resulting in unstable idling. @2019

After that, the engine will detect the electrical signal of the oxygen sensor, which is out of range, and when it is pointed, it will light up our fault light to indicate that we need to check the oxygen sensor.

The engine fault light is related to the oxygen sensor, but it is not necessarily an issue with the oxygen sensor. Here, we need to know why the fault light of the engine is on, what is the reason why the fault light is on, and what are the types of faults. However, damage to the oxygen sensor will cause the fault light to be on, such as damage to the heater of the oxygen resistance sensor, wiring problems, and damage to the oxygen sensor.

Why do engine failure lights come on? The main control of the engine's electronic control system is to control the engine's air-fuel ratio and ignition advance angle. In addition, it controls nearby idling, acceleration conditions, emission treatment systems, and more.

It mainly consists of a processor and various auxiliary systems. When a system fails, the self-diagnostic system can detect the entire electronic control system. When a fault is found, the fault is stored** and the fault indicator light on the dashboard is lit to alert the owner so that the owner can maintain the vehicle.

So when the engine fault light is on, the correct thing to do is to read the fault code, rather than suspecting a sensor with feeling. When the oxygen sensor is damaged, the fault indicator will light up, and the fault codes read are usually P0031 (oxygen sensor heater failure), P0130 (oxygen sensor control circuit failure), P0133 (oxygen sensor circuit slow response), etc. When we know the specific fault**, we can carry out fault repair according to the maintenance process of Nian Yingzhao.

We know that the oxygen sensor detects the concentration of oxygen ions in the exhaust gas, but if the fault code of the oxygen sensor is reported, it is not necessarily that the oxygen sensor is damaged. For example, if the mixture is too thin or too thick, the data detected by the oxygen sensor will not be accurate, because it may also be a problem with the air flow meter. If the air flow meter is problematic, the air intake will be inaccurate, and the air-fuel ratio will be inaccurate.

To sum up, the engine fault light is related to the oxygen sensor and will cause the fault lamp, but the engine fault light is not necessarily an oxygen sensor problem, we need to read the specific fault ** to know the specific fault location.

Of course, the front and rear oxygen sensors are installed backwards, and if they are reversed, the sensing will be ineffective, because the front oxygen sensor and the rear oxygen sensor are installed differently, so the two of them are not the same as the infiltration, and after the installation is reversed, it is naturally not able to play the due sensing role.

Among them, the front oxygen sensor, which is installed in a vacuum environment, is a sound sensor controller, and the rear oxygen sensor, where it is installed, is a mixture of nitrogen and nitrogen and hydrogen, and it is also a respiratory sensor controller, so it must be separated when installing, which is the front oxygen sensor, which is the rear oxygen sensor, and only the installation in the normal position is the best.

Of course, after the front and rear oxygen sensors are installed in reverse, it is easy to cause some failures, such as the fuel system diagnosis is too thin, when the mixed gas is too thin or too thick, it is easy to cause insufficient engine power, so when the mixed gas is too thin, it may also be caused by the front and rear oxygen sensors plugged in.

In the end, why does the oxygen sensor fault light turn on repeatedly, in fact, this is to remind that the oxygen sensor is faulty and needs to be repaired or replaced in time. However, it may be difficult to know which type of fault it is. So next, let's list the failure analysis of the oxygen sensor one by one.

Poisoning malfunction

Oxygen sensor poisoning can be said to be the most common fault phenomenon. There are also two types of lead poisoning, the former is often found in cars that run on leaded gasoline, and the latter is a silica substance produced by the combustion of silicon compounds contained in gasoline and lubricating oil.

Then, we can judge the fault by looking at the color of the tip of the oxygen sensor (the normal color is light gray). If it is a white tip, it means that the oxygen sensor has been contaminated with silicon to a certain extent and needs to be replaced in time. If it is brown, it is caused by lead contamination and it has to be replaced.

However, if it is a black top, it is mainly caused by carbon deposits, and it only needs to be cleaned.

Ceramic chipping

The ceramic of the oxygen sensor is hard and brittle, and it may be broken by striking with a hard object or blowing with a strong air current, resulting in the oxygen sensor not being able to maintain normal working condition. As for the judgment method, first of all, we need to remove the oxygen sensor from the exhaust pipe, check whether the vent hole on the sensor housing is blocked, and whether the ceramic core is damaged. If it is really damaged, it will naturally need to be replaced with a new one.

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.

The line is disconnected

The internal wiring of the oxygen sensor is disconnected.

However, both faults, wire flashing and line disconnection, require the use of a professional fault detector to extract the data stream (amplitude and frequency of voltage variation of the oxygen sensor). If the frequency is less than 10 seconds, we can preliminarily determine that the oxygen sensor is faulty. If the feedback voltage of the oxygen sensor does not change significantly in the voltage, then it can basically be determined that the oxygen sensor has been damaged.