What do car warning lights stand for?

the tire pressure warning light represents abnormal tire pressure, the engine failure light represents engine failure, the battery warning light represents insufficient battery power, the oil warning light indicates that you can't drive without engine oil, and the water temperature warning light indicates that the temperature is too high, so you need to stop and rest.

Another common warning light is the brake warning light. The icon is a circle in a bracket with an exclamation mark in it. When this warning light comes on, it means that the brake oil of this car is not enough, or the brake pads are too worn. At this time, you should go to the 4S shop for maintenance as soon as possible, with the focus on checking the brake oil and brake system.

1. Engine fault warning light

The engine fault light is used to display the working state of the engine. When starting, turn the key to the "ON" position, the car will perform self-inspection, and the indicator light will also light up, and the indicator light will automatically go out after starting the car. If the indicator light is always on after starting the car, or it is on when driving, it indicates that there is a fault in the engine system, such as excessive exhaust emission, poor combustion state, knocking, valve distribution system fault, abnormal data of various sensors, and so on.

generally speaking, when the engine fault light is on, if no other fault lights are on at the same time, you can drive normally and drive to the repair shop for inspection and treatment, but the engine may speed limit and torque limit, and the power of the car is insufficient. If the fault light is lit with abnormal sound, severe jitter and other phenomena, the engine must be turned off immediately, and the cause of the fault can be found out before deciding whether to continue driving.

on Volkswagen models, there is usually an EPC fault light, which also shows engine faults, but the faults it shows are generally related to excessive exhaust emissions, such as the use of bad gasoline, throttle fault, etc. If the brake light is not on, the EPC fault light will also be lit. Generally speaking, when the EPC fault light is on, it will not affect normal driving.

2. Warning light for low oil pressure

The oil indicator light is used to display the amount and pressure of oil in the engine, and it is generally red. When starting, turn the key to the ON position, and the indicator light will light up. After starting the car, the indicator light will go out automatically. If the indicator light is always on, it means that the pressure of oil is lower than the standard value. At this time, if you continue to drive, it will lead to poor lubrication of the engine and abnormal wear. Most of the reasons that lead to the lighting of the oil lamp are the lack of oil in the engine. We should first check the oil level, and if the oil level is too low, we need to replenish the oil. If the fault light still doesn't go out after adding engine oil, it means that there are other faults in the engine lubrication system. At this time, it is necessary to thoroughly check the engine and don't drive reluctantly to prevent further damage to the engine.

nowadays, there are usually two oil sensing plugs on automobile engines, one on the cylinder head and the other on the main oil gallery. If the engine oil pressure in the cylinder head is insufficient, the engine oil warning light will flash, but there is no sound alarm. At this time, the engine oil is insufficient or the pressure is low, so you can continue driving, but there will be abnormal noise in the valve part; If the pressure in the main oil passage is insufficient, the oil warning light will not only flash, but also give an alarm with sound. At this time, you must stop immediately for inspection and do not continue driving.

3. Water temperature warning light

The water temperature warning light is used to display the temperature of the coolant in the vehicle engine, and its color is generally red. If it lights up, it means that the engine temperature is too high, and the pointer of the water thermometer will also point to the red area. This is a very serious engine failure, and it is easy to cause engine cylinder explosion and other failures. Engine overheating is generally caused by lack of antifreeze. If the antifreeze is normal and the engine is still hot, it may be that the engine water pump is damaged or the cooling fan is damaged. Nowadays, many models no longer use water temperature meters, but display the coolant temperature with the color of indicator lights: blue means the water temperature is too low, extinguishing means the water temperature is normal, and red means the water temperature is too high.

4. Engine charging indicator light

The engine charging indicator light is used to display the working state of the automobile power generation system. Its color is red, and its icon is in the shape of a battery, so it is also called battery light. When starting, turn the key to the ON position, and the indicator light will light up. After starting the car, the indicator light will go out automatically. If the indicator light is always on after the car is started, it means that the engine charging system is faulty, and the generator does not generate electricity or can't charge the battery. At this time, the engine runs and consumes the stored electricity in the battery. When the electricity is exhausted, the engine will automatically turn off and can't be started again. The causes of this failure may be internal fault of the generator, loose or broken belt of the generator, disconnection of the wire from the generator to the battery, etc.

5. Brake system fault light

The brake system fault light is generally red, which monitors the running status of the automobile brake system, such as whether the brake fluid is sufficient, whether the brake pad is worn to the limit, whether the hand brake is released, and so on. If the brake system fault light is on, we must first check whether the hand brake is completely released. If the hand brake system is normal, we need to check whether the brake oil level is normal or whether the brake pads are too thin.

6. ABS system fault light

ABS system fault light is used to display the working state of automobile ABS system, and its color is generally yellow. When starting, turn the key to the ON position, and the indicator light will light up. After a few seconds, the indicator light will go out automatically. If the indicator light is always on after the car is started, it indicates that the ABS system is faulty. The most common fault reason is that the wheel speed sensor is dirty or invalid. Others, such as ABS pump fault and circuit fault, will also cause the ABS system fault light to light up.

It should be noted that the ABS system of an automobile is the basis of active safety of the automobile braking system, and other functions are developed on the basis of it, such as body stability control system, traction control system, electronic braking force distribution system, brake assist system, and so on. When the ABS system fails, these functions will also fail. But at this time, the car will still maintain the conventional braking, not that the braking system is out of order, but the braking effect of the car at this time will be greatly reduced.

7. Seat belt indicator light

The seat belt indicator light is generally red. If there is a person sitting in the seat but the seat belt is not fastened, this indicator light will light up with an alarm sound. In the past, many people didn't pay much attention to seat belts, didn't like to wear seat belts when driving, and even deceived themselves with seat belt buckles. I didn't even know this indicator light, and I made a big joke that there was an assassin with a sword in the car. But now people pay more and more attention to safety, and it has become a basic driving habit to fasten your seat belt when you get on the bus.

8. airbag fault light

the airbag fault light shows the working state of the airbag and is generally red. When starting, turn the key to the ON position, and the indicator light will light up. After a few seconds, the indicator light will go out automatically. If the indicator light stays on after the car is started, it means that the airbag system is faulty. At this time, if there is a collision, the airbag will not pop up, which greatly affects the driving safety. Therefore, this fault light should be repaired in time when it is lit.

it should be noted that there are many accident vehicles whose airbags were shot out in the accident, but they were not replaced and repaired in the later maintenance, so such vehicles are equivalent to having no airbags. In this case, the airbag fault light will light up. In order to cope with this situation, many people artificially cut off the line of the airbag fault light so that the fault light will no longer light up. When such a car is sold as a used car, if the buyer doesn't pay attention to this, it will suffer a big loss. Therefore, when we check this used car, we must turn the key to the ON position to see if the indicator light is on, and it will go out automatically after a few seconds. If this light doesn't work all the time, you should pay special attention.