How to eliminate the car engine fault light

Engine failure lights can be divided into three situations:

1。The car cannot start, which may be caused by the failure of the fuel pump or ignition parts, and you need to call ** directly for help;

2.The fault light is on, but there is no abnormality in driving. This may simply be a sensor failure that requires a low-to-medium speed deceleration to a nearby repair shop;

3.The fault light is on, and the vehicle can drive, but there are symptoms such as violent shaking and insufficient acceleration, and you need to wait for rescue.

Check the front and rear oxygen sensors first, this thing is broken, the initial appearance is shown in the instrument to show that the engine fault light is always on (or occasionally flashing), but the car can barely drive for a short time; If it is not repaired for a long time, the computer (ECU) of the electronic fuel injection system will not be able to obtain the information of the oxygen concentration in the exhaust pipe, so it will not be able to feedback and control the air-fuel ratio, which will make the engine fuel consumption and.

There are many reasons why the engine lights up. Here are some common solutions.

1.The fault light due to carbon deposits is always on.

Due to the uneven quality of fuel on the market, urban road congestion, spark plugs are prone to carbon deposits, which often leads to poor engine operation, so the fault light is on.

Exclusion: Check the spark plug for carbon deposits and wipe it off with a copper brush. It is also possible to clean the dry ice of the vehicle oil circuit and engine cylinder according to the situation.

2.Engine failure caused by the oxygen sensor lights up.

There is a high probability that the engine failure light will be turned on, and there is a high probability that the oxygen sensor will fail when it is turned on and off. Generally, oxygen sensors can be used for 3 years or more. If the new car has a yellow light for engine failure, check if the oxygen sensor plug is loose.

Exclusion: Check whether the plug of the oxygen sensor is loose before and after, and the oxygen sensor is not working properly due to oxide blockage. Clean with carburetor cleaner or ferric chloride solution diluted with sulfuric acid and replace the damaged oxygen sensor.

3. Engine failure lamp caused by engine oil.

Part of the reason is that non-standard gas stations are filled with low-quality gasoline, resulting in insufficient oil and gas co-burning. Finally, turn on the fault light. This situation will not affect driving safety, but long-term use will more or less cause damage to the engine.

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.

There are 2 ways to clear engine fault lights:

A tester can be used to clear the engine's fault codes.

The fault code can be cleared by disconnecting the negative electrode pile head of the battery.

It is recommended to use a detector to read the fault code of the engine, and then check the fault point according to the fault code. Drain engine failure.

1. Phenomenon: During the driving of the car, or the moment the car is ignited, the car engine fault light on the dashboard lights up, usually a red or yellow light, once it is lit, it will not disappear automatically in most cases, and it will disappear automatically in a few cases, which is the so-called engine fault light.

2. The surface reason for the engine failure light is 1. The combustion state is not good, and the engine combustion state is not good, which is the main reason for the engine failure light. 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. Each of the above indicators means:

Hydrocarbons (HC): unburned fuel oil components; Carbon monoxide (CO): an inadequately burned fuel component, which has great damage to human health, and carbon monoxide poisoning can cause poisoning death; Nitrogen oxides (NO):

Produced at excessively high temperatures in the engine, it indicates that engine wear is intensifying, and the atmosphere will pollute the environment. 2. Engine knock The engine has a special knock sensor to monitor the engine knock. Engine knocking already means that there is a risk of serious damage to engine parts or a significant loss of power.

In the case of non-inductive detonation, the engine computer will adjust the engine control parameters according to the monitored situation to avoid greater adverse effects, but when the non-inductive detonation has exceeded the range that the engine computer can adjust, the engine fault light will also light up the alarm.

There are usually three situations in which the driver of a car feels about a knock: the first is that the car is weak; The second scenario:

The car is weak and the engine is too noisy; The third case: there is an obvious knocking sound. In the first case, some engine fault lights will turn on, some will not, and in the second and third cases, the engine fault lights will inevitably come on.

3. The internal reasons for the engine failure light to be on 1. The fuel quality is not good.

There are many factors that cause the failure light to turn on, such as:

The water temperature of the engine cooling system is too high, and the cylinder block is too hot;

special engine timing;

A flow meter that measures the air intake;

Throttle failure.

To be on the safe side, it is advisable to go to a car repair shop for a check-up and repair.

There are too many possible reasons for the engine failure light to turn on, and they can be roughly divided into the following three categories:

1. False failure. Report the fault**, but the work is normal, it may be that a certain operation is beyond the control of the computer, and the fault of the computer feedback can be eliminated first, and then see if the fault code is still jumped.

2. Minor faults. There is no particularly obvious fault in the engine, according to the computer detection information and further inspection, it is found that there is really some kind of fault, which does not affect normal driving or has little impact, and needs to be found and solved in time. For example, the inlet pressure sensor is faulty, etc.

3. Major failures. Such faults are noticeable to the naked eye and driving sensations, and seriously affect the normal operation of the engine, requiring immediate repair. For example, the engine is obviously underpowered, and it is likely that the oxygen sensor is a problem.

If it is not a double B car, it is generally domestic, and the Japanese and Korean systems will take the battery back after 30 seconds to one minute after powering off, so that the computer can be initialized, and it can generally be eliminated. If it doesn't work, you have to go to the 4s or service station to eliminate it with an instrument, it should be free, and it can be done in a few seconds.

What should I do if the dashboard lights up yellow?

The fault light is lit because of the electronic control system. A malfunction has occurred. The electronic control system detected the wrong data.

Dedicated. The computer is wrong.

The location where the erroneous data is left. Confirm the fault. Confirm that the electronic control system is faulty, and light the indicator light on the meter.

At this time, you should go to the repair shop for maintenance in time. First of all, the fault code should be called. The direction indicated according to the fault code.

Troubleshoot. After troubleshooting. Clear the fault code in the computer.

Only then will the fault light go out.

How to eliminate the car engine fault light after maintenance? If you know what the fault code is, and the symptomatic repair, there should be a fault diagnosis, also use fault diagnosis, you can easily eliminate it, if there is no fault diagnosis instrument, you can use the power off method to cut off the long-connected power supply of the engine control module, unplug the fuse of the bed power supply, wait for a minute, and then power on for testing.

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The way to deal with the car's engine failure light is on:

1.Cleaning the entire fuel system with fuel additives;

2.Add higher grade gasoline after engine cleaning;

3.Improve the cleanliness of fuel with first-class fuel additives;

4.Replace the three-way catalytic converter.

After the repair is complete, use a fault diagnosticator to clear the fault** or unplug the power supply fuse from the ECU.

More than a minute.

If it is repaired, the engine fault light can be extinguished by decoding it with a special computer, and some also need to be matched.

Start and turn off the vehicle three times in a row, or you can unplug the negative pole of the engine battery, wait for 30 seconds and then connect it, which can basically be eliminated. If the fault light is still not off after the power is off, or the fault light is off just now, and it is on again after a few days, this situation means that the engine is indeed faulty and you have to go to the repair shop for testing.

The engine fault signal is sent by the ECU (engine computer), and the ECU controls all the electronic equipment of the entire engine, such as electronic throttle, fuel injector, generator, fuel pump, etc., covering various systems such as air intake, exhaust, fuel, ignition, timing, etc.

There are many reasons for the failure of the car engine, including the failure of sensors, such as water temperature sensors, crankshaft sensors, oxygen sensors, etc.; There are also other faults like spark plug failure, ignition coil failure, fuel pump failure, oil circuit blockage, etc.

Generally speaking, there are two situations when the engine fault light is on: one is the yellow symbol light, which means that the engine is faulty, but the fault does not affect the normal operation of the engine, but it must be tested and repaired; One is the red symbol light, indicating that the engine has a serious fault, under normal circumstances, it needs to be repaired immediately, if it is in special road conditions, it can be used in an emergency, but you need 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 ask for rescue to avoid affecting the performance of the engine.

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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.

When the engine fault light is on, tell the owner that there is a problem with the current engine system and need to be checked and repaired in time. Secondly, at the time of repair, these fault information will be stored and provided to the mechanic for reference in order to solve the fault faster. In addition, in order to ensure that the engine can continue to run when it fails, 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 initiates an emergency procedure, and the engine can also work under the emergency procedure, but generally only to ensure that the engine continues to run. In this case, we need to make a preliminary judgment: turn off the positive or negative terminal 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 returned by the gauge will still be on. If not, there is no problem with the engine and there is no need to go to the repair shop for inspection.

Some high-end cars will lose a lot of data after a power outage and need to be set up again, so be careful when the power goes out

After doing that, you may encounter three situations:1. The fault light went out just after it was finished, and it came back on a few days later. 2.After the power was cut off, the fault light was still not extinguished. In this case, the engine did fail, so we needed to go to the repair shop to check.

The fault light of the engine is on, indicating that the electronic components of the engine have a performance failure, so this fault light is on. Do I need to use a repair computer to detect fault codes? According to the meaning of the fault code, the fault light can be eliminated.

The yellow sign on the engine dashboard refers to the fault indicator of the exhaust system.

Possible Lighting Causes: Exhaust System Failure.

What to do with the light situation: slow down and drive carefully to the nearest authorized dealer of our company and check the engine.

Possible causes of flashes: engine misfire and damage to the catalytic converter.

How to deal with flash: Slow down, drive carefully to the nearest dealer, and check the engine.

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

Yellow symbol light, indicating that there is a problem with the engine, but the fault does not affect the normal operation of the engine, but it is necessary to check and repair;

After reading my introduction, do you have any idea about how to solve this problem when the engine lights on? So do you like the car knowledge that I recommend today? I think we have to have a good understanding of these things about car maintenance knowledge, which is still very important for car use.

Finally, I hope my launch will be helpful to everyone.