What s going on with a car engine with a yellow light

Reasons why the engine lights up yellow: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 combustion state is not good. Poor engine combustion condition is the main reason why the engine failure light is on. In order to ensure that the engine is in good working condition and 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.

2. Poor fuel quality. 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. Some gas stations are unable to adequately fuel high-performance engines according to specifications, resulting in frequent engine failure lights.

It should be noted that there are two situations when the engine yellow light on the car dashboard is on, the first is that when we turn on the power supply of the car, the vehicle will conduct a self-test, at this time, not only the engine yellow light will be on, but other fault lights will also be lit together, and then they will be extinguished together, which is a normal phenomenon; The second is that after the car starts, the yellow light of the engine fault is still on, which is an abnormal phenomenon that the ECU is reminding you that the engine is faulty.

Can the engine still turn on with the yellow light on?

Generally, after the yellow light of the engine is lit, the following situations will occur, as for whether it can continue to drive, we can refer to the following statement.

The first is that the car can't start after the light is on, which may be caused by the failure of the fuel pump or ignition parts, and you can't drive it if you want to, so it's better to simply call a tow truck for help.

The second is that the fault light is on, but there is no abnormality in driving, which may only be a sensor failure, or a false failure, in this case, you can continue driving temporarily, but for the sake of safety, it is best to slow down at low to medium speed, and then immediately drive to a nearby repair shop for maintenance.

The third is that the engine fault light is on, the vehicle can be driven, but there are symptoms such as severe shaking and acceleration weakness, don't take the courage to try your luck in the face of this situation, continue to drive may increase the fault, damage the engine, or cause other failures, so it is not recommended to continue to drive, you should call for help**, wait for support.

This light is called: Engine Fault Warning Light. 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 oxygen concentration in the exhaust pipe, so it will not be able to 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. Therefore, it is necessary to troubleshoot or replace it in a timely manner.

Generally, today's cars have two oxygen sensors at the front and rear, respectively in the front and rear of the three-way catalytic converter, and the faulty one should be replaced in time. The failure of this product mostly occurs in the case of mixing gasoline (ethanol gasoline, etc.) with different grades and types of gasoline in different regions, or adding fuel treasure.

If that's the problem, hurry up, don't delay. In 4s, plug in the computer and measure the exhaust gas flow data feedback.

The engine light is yellow, indicating that the car engine has failed, the reason is that the oil quality is poor, the oxygen sensor is faulty, the air flow sensor is faulty, the spark plug carbon, the engine knocks, the water temperature sensor is damaged, etc., if the above problems have been checked, the engine lights are yellow, the vehicle can not start, and it needs to be rescued.

The engine fault light is on, but when the car is driven, as long as there are no symptoms such as shaking, frustration, and black smoke from the exhaust pipe, you don't have to worry, you can drive it with confidence, mainly because of poor combustion, false failure caused by poor contact with the oxygen sensor, pull the engine at high speed, clear the oil circuit, and after changing the fuel, it will return to normal after a period of time. On the contrary, it is necessary to use a computer to read the fault code for symptoms.

Since the engine has a yellow light, it must be a fault in the relevant part of the engine, once this yellow light warning appears, you must go to the car repair station to overhaul the vehicle as soon as possible.

The engine light on the car is on, and the light is on when the vehicle is started normally, which is called engine self-test, if it is said to start the vehicle, the same amount after starting, it may be faulty, you can use the computer, and then go to detect its failure? And then to determine what is the fault of it?

The car engine lights up yellow, it also depends on what the situation is, if the engine is running normally, it can be ignored, my Q5 has been on for almost a year, and it is not running normally.

1. First of all, although the fault light is on, but the car does not have a big problem, and can continue to drive, then, it is necessary to consider whether the sensor is faulty, at this time do not have to worry too much, it will automatically recover, or because of the interference of some external conditions, in fact, it should not affect the vehicle driving, but may have a certain impact on emissions. In this case, you can continue to drive for the time being, be very careful during the drive, and have time to go to the factory for testing.

2. If the fault light is on, there is a problem with a certain part of the car, or the car is difficult to drive, then it cannot continue to drive at this time, and it is called a rescue trailer. Because the car has a breakdown and there is a serious problem, continuing to drive will aggravate the problem, or the resulting problems will gradually accumulate and develop other problems, so it is not recommended to continue driving.

3. Take care of the car, if the engine fails, you should do it in time, don't wait for the problem to deteriorate, and don't take the risk of driving a faulty car.

If you say that the car is started, the same amount after starting, it may be faulty, can you use the computer, and then go to detect its fault? And then to determine what is the fault of it?

It shows that the oil level of the automobile engine is not enough, and the oil needs to be added immediately, and the oil should not be lower than the lower limit, otherwise it will cause insufficient engine lubrication, which will cause rapid engine wear and tear, and the danger of engine explosion will be caused in serious cases, and it should not be higher than the upper limit, otherwise it will cause oil leakage in the vehicle; The specific operation steps for adding engine oil are as follows:

1. Open the door on the cab side of the car.

2. Pull the hood switch on the left side of the driver's leg of the car.

3. Lift up the hood of the car's engine.

Fourth, use the support rod to support the engine hood of the car, and ensure that the support is firm to avoid danger during operation.

5. Unscrew the oil cap of the car engine and add the oil.

6. The oil level of the car can be in the middle of the upper scale and the lower scale line.

Hello, this is a reminder that the engine electronic system is faulty, you need to do a test for the car, please go to the repair shop as soon as possible to see the specific fault code.

There are many reasons, please go to a professional store to do a system check, but don't be fooled, start with cheap parts and inspections, as long as the machine has no abnormal noise, no lack of power, there is no big problem:

First, go to 4S to check the engine with a computer, and repair it according to the fault code.

3. The oxygen sensor is dirty and needs to be cleaned or replaced.

It's a new car, don't think about it, there is no problem, it's time to go to the 4S shop to do the first insurance, the 4S shop said that it was 2,000 kilometers and then do it, but this is what they say, if there is a problem, go and see it first.

Where are you? I also had a 60,000-kilometer maintenance that happened not long after. 4S began to say that the camshaft was broken, and it was still bright after replacement, and then it was to wash the throttle and weld the wire harness, and finally even the gasoline filter was washed, and it was still bright again after it was gone.

It was tossed until 66,000 kilometers that it was found out that the secondary air pump was broken. I asked for a replacement again, how did you solve it later?

The engine fault light is on, it could be an air flow meter, or it could be an air pump.

Secondary air injection refers to the injection of air into the exhaust pipe, but not casually, but according to different vehicle conditions.

If you say that there is a problem with secondary air, then you can only inject air all the time, or never inject air at any time.

If there is a problem with the former, you can still see some problems, but if it is the latter, then it is difficult to find the problem.

You can do this, you start in the cold car or try to hit the gas pedal (do it a few more times and then re-start the car,) and cycle back and forth a few times (press the accelerator hard and release the throttle and then wait for three minutes to turn off the engine, and then continue to do this a few times) Try it, if it is not good or the yellow light is still on, then I don't think it is a problem with the secondary air pump.

There are two scenarios when the engine fault light is on:

1) Yellow symbol light, indicating that the engine is faulty, but the fault does not affect the normal operation of the engine, but it must be maintained;

2) 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; But as a reminder, EFI engines have self-protecting control systems, which won't let you ignore the life or death of the engine.

What does it mean when the engine fault light is on?

In today's cars, the engine is controlled by a computer (that is, what we usually call an EFI or electronically controlled engine). In order to maximize the reliability of computer control, the car computer itself has a self-diagnosis function. That is to say, as long as the engine is in working condition, the computer will continue to detect the operation of each system, once it finds that there is an abnormal situation, the computer will do three things:

Clause. 1. Light up the fault lamp and tell the driver that the system is now in a faulty operation state, and it should be checked and repaired in time.

Clause. Second, the detected fault information is stored, which can be provided to the repairman as a reference during maintenance, so as to solve the fault faster.

Clause. 3. 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 normal operation of the engine, the computer will directly ignore it. But in fact, the engine is not working at its best at this time.

If a more serious fault is detected, the computer will start the emergency program, and when the engine works under the emergency program, it does not consider whether the fuel consumption will increase? Will the motivation go down? There is only one purpose, which is to ensure that the engine can continue to run without stalling.

The yellow light is the engine fault light, which means that there are some faults in the engine after this light is on, and the defeated riders need to check and repair the fault in time.

The normal operation of the engine is inseparable from the sensor, and there are intake air flow sensors, intake air temperature sensors, oxygen sensors, water temperature sensors, camshaft position sensors, etc. around the engine. If a sensor around the engine fails, it may cause the engine to not function properly, and the engine fault light will illuminate.

If the amount of gasoline added is too poor, it may also cause the engine failure light to come on.

If the engine fault light is on, it is recommended to drive to the repair shop or 4S shop immediately and let the professional technician read the fault code of the car. Fault codes can help technicians quickly determine the cause of the fault and find the fault location.

During the usual maintenance, you can also ask the technician to read the fault code of the car, so that you can know the fault on the car in time.

The car is no longer just a machine, there are many sensors and electronic systems in the car with high fluid chatter, and when these electronic systems fail, it can cause the engine to not work properly.

The electronic systems in the car are more prone to failure after a long period of use.

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.