How to solve the car engine fault light on?

Engine indicator refers to the indicator light used to show the working condition of the vehicle's engine. The indicator light is used to show the working condition of the vehicle engine, when the key door is opened, the vehicle self-test, the indicator light is lit and automatically extinguished, if it is always on, it means that the engine of the vehicle has a mechanical failure and needs to be repaired.

The knock sensor is installed in the middle of the engine block, and the four-cylinder engine is installed between the 2nd and 3rd cylinders, or one in the middle of the 1st and 2nd cylinders, and one in the middle of the 3rd and 4th cylinders. Its function is to measure the degree of engine shake, and to adjust the ignition advance angle when the engine detonation.

Reasons for engine failure light 1. Poor combustion state The poor combustion state of the engine is the main reason why the engine failure light is on. In the design of the car, in order to ensure that the engine is in good working condition and ensure the normal working life of the engine, an oxygen sensor is designed and installed on the engine to monitor the combustion state of the engine.

The engine fault light is not necessarily the engine failure, but more often some parameters exceed the standard value, such as exhaust emissions exceeding the standard, or for some reason the engine fires, etc.

The vehicle fault light is on, which can be solved by the positive and negative power supply.

The vehicle fault light is on, which can be solved by the positive and negative power supply.

One: You can pull out the fuse to clear the fault code, if it can't be solved, go to the maintenance unit to use the decoder to clear the fault code to see, if you can't clear it, it needs to be repaired.

2: Generally, the decoder is used to clear the fault code, and some units will charge a small labor fee.

Generally speaking, there are two situations when the engine fault light is on:

1. The yellow symbol light indicates that the engine is faulty, but the fault does not affect the normal operation of the engine, but it must be tested and repaired;

2. The red symbol light indicates that the engine has a serious fault, and it needs to be repaired immediately under normal circumstances, if it is in special road conditions, it can be used in an emergency, but it is necessary to pay attention to the working status of the engine at all times.

If the water temperature is too high or the oil pressure warning light is on, if you obviously feel that the vehicle is faulty, you should immediately pull over and call the maintenance station to request rescue to avoid affecting the performance of the engine.

First of all, the fault light is on, thus telling the owner that the current engine system is faulty, and it should be checked and repaired in time. Secondly, this fault information will be stored and provided to the mechanic as a reference during maintenance, so as to solve the fault faster. In addition, in order to ensure that the engine can continue to run in the event of a failure, if the detected fault has little impact on the operation of the engine, the computer will directly ignore it, but in fact, the engine is not in good working condition at this time.

If a serious fault is detected, the computer will start the emergency program, and the engine can also work under the emergency program, but generally only to ensure that the engine can continue to run without turning off.

For this situation, we need to make a preliminary judgment: de-energize the positive or negative pole of the car battery, disconnect it for a few seconds, and then install it. After that, start the car and see if the engine fault light will be lit when the instrument is still on, which means that there is no problem with the engine and there is no need to go to the repair shop to check.

Some high-end cars will lose a lot of data after the power failure, and it needs to be set again, and the power failure needs to be cautious) may appear after doing it: 1. The fault light is off just now, but it is on again after a few days. 2. After the power is off, the fault light is still not extinguished.

This situation is that the engine is indeed faulty and needs to be tested by a repair shop.

If the temperature of the engine wall is very high, the mixture enters the cylinder and encounters the wall of the boiling soup is not condensed and gasified, and the mixture gasified at high temperature is conducive to the combustion of the mixture, which is conducive to the smooth and normal operation of the engine.

Engine shaking means that the mixture inside the cylinder is not completely combusted, the incomplete combustion of the mixture will be discharged through the exhaust valve during the engine exhaust process, at this time there is an oxygen sensor installed on the exhaust pipe channel, his function is to check the oxygen content in the exhaust gas discharged, the more fully the mixture is burned in the cylinder, the less oxygen is contained, on the contrary, the more, the oxygen sensor uses this working principle to detect and convert the electrical signal that the computer can identify to the engine control computer, and the computer then according to the set software program, The parameters of the engine working state are collected by each sensor on the engine and sent to the ignition system after correction and calculation, and the work instructions of the fuel injection system are corrected, and these systems correct the working parameters to complete ignition and fuel injection after receiving these work instructions, and the engine has entered the work of ignition and combustion again at this time, so that the work is repeatedly adjusted. When the computer receives the parameters of the oxygen sensor after the exhaust emissions seriously exceed the national legal standards, the internal program of the computer can not be corrected to the standard range, at this time, the engine control computer will send a warning light (yellow pollution light on) through the instrument to remind the owner to the maintenance station to check the cause of the engine pollution emission lamp.

Engine Failure Cause Light:

1.The inside of the engine cylinder is not clean and there is carbon deposit.

After a certain period of use, there will be some carbon deposits accumulated inside the engine, which will change the design parameters of the engine itself, and at the same time, the properties are unstable, which will accumulate heat, resulting in disorderly ignition of the engine, thereby causing engine detonation. In this case, the engine failure light will illuminate.

2.The burning state is not good.

Poor engine combustion condition is the main reason why the engine failure light is on. In the design of the car, in order to ensure that the engine is in good working condition and ensure the normal working life of the engine, an oxygen sensor is designed and installed on the engine to monitor the combustion state of the engine. Once the engine burns badly, it will not only pollute the environment, but also lead to fuel waste and excessive wear and tear of the engine.

3.Poor fuel quality.

Many riders who find that the engine failure light is on have a feeling that the engine failure light suddenly turns on after adding a tank of fuel. Due to the requirements of the engine for the quality index of the oil, especially with the higher and higher requirements of various specifications for the engine, the requirements for the oil quality index are also getting higher and higher.

The solution to the engine failure light on.

1.Clean the engine.

Once the engine fault light is on, the owner should clean the engine in time. Currently, there are two correct cleaning methods:

1) Go to the repair shop to clean the carbon deposits with a special cleaning agent.

2) Clean the entire fuel system by yourself with good fuel additives, including removing carbon deposits from the cylinders.

2.Add a higher grade of gasoline.

After the engine is cleaned, because the compression ratio of the automobile engine that meets the national emission standard is generally above, this kind of car is not suitable for long-term gasoline below 95. In order to keep the engine in good working order, the owner can choose to add 95 or 97 gasoline, which can usually solve the problem of the engine failure light on.

The solution to the failure light of the automobile engine is: 1. Check the status of the automobile engine in time; 2. Check the status of the sensor, air flow sensor and spark plug parts of the car; 3. Check whether the car has detonation; 4. Check whether the ignition coil is faulty.

The car engine fault light you said should be a yellow sign, this sign represents that there are several problems, it may be that there is a problem with your steam filter, this situation is likely to be a problem with the inferior oil of a small gas station, or it may be a problem with the three-way catalysis.

1. Identify the cause of the failure. For diagnostics of such faults in which the engine does not start, the battery should be tested first. It is necessary to find out if the engine does not start because the battery is insufficient.

2. Detect ignition timing. Timing belt slippage is the root cause of the failure that there is no electric spark and the engine cannot start.

3. Detect the starting system. In the case of faults such as engine failure to start, the first thing to do is to check the circuitry in the engine starting system. From the perspective of the most basic composition, the circuit of the starting system generally includes the following basic parts, that is, the battery, the starting motor and the cable connecting these parts.

Of course, in addition to this, ignition switches, starter relays or solenoid coils, as well as in-vehicle anti-theft systems, are also important components of the starting system.

4. Detect the quality of electric sparks. Once the circuitry of the starting system has been tested and proven to be fine-tuned, attention should be focused on why the engine is not working. Generally speaking, the ignition system of the engine is tested first, which is also the easiest inspection job.

In early ignition systems, you could easily remove the ignition coil and use a spark detector to detect if the spark was normal. When choosing a spark detector, an adjustable detector is preferable to a fixed design because it allows you to adjust the detector to a smaller gap so you can tell if there is no spark at all, or if there is an electric spark but it is weak.

5. Detect the fuel system. The diagnosis of the fuel system can be divided into two parts: the diagnosis of the fuel supply system and the diagnosis of the injector circuit system.

The fuel supply system can be detected by measuring the flow and pressure of the fuel. The best way to measure fuel flow is to inspect the line when there is a load in the fuel supply line.

After the engine fault light is on, restart the vehicle or gently test the joints of each wiring harness to check whether the fault light will be turned off to avoid the fault light being lit due to the random connection of the wiring harness.

There are still many reasons, such as excessive carbon accumulation, blockage of air filters, etc.

There will be a portable diagnostic instrument in the repair shop, which can read the fault code, and after obtaining the fault code, you can roughly know what is causing it.

When the engine fault light is on, it can be divided into three situations, each of which has a different way to deal with it

1.The car does not start; This may be caused by the failure of the fuel pump or ignition parts, so call ** for help.

2.The engine fault light is on; The vehicle can be driven, but there are symptoms such as severe shaking and weak acceleration, so pull over and call for help in the face of this situation.

3.The fault light is on; But there is no abnormality in driving, this may just be a sensor failure, in this case you can continue driving for a while, but it is better to slow down at low and medium speeds, and then go to the repair shop.

It's okay, keep driving, and then find a time to go to the repair shop to have a look, maybe there won't be.

If it doesn't affect the oil, or the oxygen sensor, you can add two cans of general additives, or additives of the National VI standard, and you can turn off the lights when you run. The car of China VI is more picky about oil, and the quality of the oil is slightly poor, so the sensor is easy to detect the problem and turn on the light.

1. The combustion state is not good.

The poor combustion state of the engine is the main reason why the yellow light on the dashboard is on.

2. Engine knocking.

There are generally three scenarios:

The first case: the car is weak;

The second case: the car is weak and the engine noise is too loud;

The third case: there is an obvious knocking sound.

In the first case, the engine fault light may be on (depending on the quality of the manufacturer's parts), and in the second and third cases, the yellow light will definitely be on.

3. The internal reason why the engine failure light is on.

1) The fuel quality is not good.

2) The inside of the engine cylinder is not clean.

4.When the cold car is started, especially when the weather temperature drops sharply, the fault light will be on when starting due to the temperature correction problem of the computer, and it will not light up as long as the temperature rises to a certain temperature and stabilizes.

5.The age of the car is too old, and the aging of the device leads to abnormal operation of the engine, which causes the combustion ignition to be poor, resulting in the fault light being on.

6.Some of the sensors themselves are faulty, causing the fault light to turn on.

Can the car be driven when the fault light is on?

Not all engine fault lights can not be turned on when they are on, only the engine fault lights are on, the cabin has no abnormal noise and abnormal conditions, the power is not affected, and the speed can be changed normally, you can continue to drive and stop the 4S shop for further investigation, because the intake and exhaust may cause the engine fault lights to be on, and the specific problems are analyzed in detail. When the yellow light is on, the engine action does not shake or a little shaky, at this time the owner does not need to worry when using it, it can be used normally, and it can be checked or maintained when there is time or convenience, but once the rider finds a problem, he must remember to go to 4S to check as soon as possible.

If it doesn't affect the oil, or the oxygen sensor, you can add two cans of general additives, or additives of the National VI standard, and you can turn off the lights when you run. The car of China VI is more picky about oil, and the quality of the oil is slightly poor, so the sensor is easy to detect the problem and turn on the light.

In winter, the engine fault light is on, and the leakage is not necessarily faulty, and when the light is lit up in cold weather, you must not worry, you must wait for the engine temperature to see if the engine failure will be extinguished, if the fault light is extinguished after the temperature rises, then there is no problem, you can drive normally.

This may be the case when starting in winter or when the temperature is relatively low, when the internal temperature of the engine is also relatively low. Therefore, at this time, when the car starts, the engine needs to reach a certain temperature to complete the basic monitoring, and the rock barrier will be monitored, and the engine fault light will be lit. When the temperature of the engine reaches a certain level, this fault is gone.

If at the start, the fault light is still on, then it is likely that there is more carbon in the cylinder, due to carbon oil absorption, resulting in the temperature in the cylinder has not been able to reach a stable temperature, at this time, it is still necessary to wait until the engine temperature rises, in order to ensure the solution of this problem. Therefore, don't be impatient in the face of this situation, make sure that there is no problem before driving, after all, safety comes first.

The engine fault light is on, and it is usually okay to drive at low speeds with caution if there is no particularly noticeable fault. However, if there is an obvious fault in the engine, such as serious abnormal noise, serious shaking, engine smoke, etc., you must not drive on the road.