What is the reason why the car engine fault light is on
We know that a variety of indicator lights or warning lights are made under the mask of the dashboard of modern cars. When our engine or related parts fails, the engine failure indicator on the car dashboard will light up. Play a precautionary role. Generally, the main reasons that cause the engine fault light to turn on are as follows.
1. Sensor problem
The sensors mentioned here include water temperature, crankshaft position, air flow, intake air temperature, oxygen sensor, etc. When these sensors are damaged, poor contact or signal interruption, the car's ECU cannot accurately obtain engine data. Cause the engine fault light to turn on.
2. Maintenance issues
Poor maintenance of the engine is the most common cause of engine failure to light up. We know that vehicles have a certain maintenance cycle. If the owner does not maintain on time, coupled with bad driving habits, it will increase the burden of engine operation. In the end, you can only use the fault light to remind you that you should care about yours. Love the car.
3. Oil quality problem
The oil quality mentioned here includes fuel and engine oil. We know that the fuel that the car fills is generally marked, and the engine oil is also divided into semi-synthetic and fully-synthetic. The manufacturer generally recommends which type of fuel to be used by the car owner. If the owner does not add the oil as required, it will cause the wear and tear of the engine for a long time, so no one is to blame for the fault light.
4. Poor combustion of mixed gas
Engine spark plug failure, ignition coil failure, fuel pump failure, oil circuit blockage, etc. will cause poor combustion of the engine mixture. Poor combustion of the mixture is caused by carbon deposits or knocking problems in the engine, and these will eventually be detected by the engine's oxygen sensor, and after reporting to the ECU, a fault light is naturally lit to show a warning.
5. Air intake problem
When the engine is burning, it needs air intake. In this process, the air filter element is very important. If the air filter element of the car is not clean, it will affect the air intake of the car if it is not cleaned regularly. It will cause the engine malfunction light to turn on.
6. Supercharging problem
The intake supercharging pipeline and turbocharger can also cause the engine fault lamp to light up. The most common is the damage of the turbocharger. At the same time, the vehicle will also have symptoms such as oil leakage, high oil consumption, power drop, abnormal metal noise, and blue smoke or black smoke from the exhaust pipe.
7. Exhaust problems
Rear oxygen sensor, three-way catalytic converter, exhaust camshaft and bearing bush. The most common one is that the failure of the three-way catalytic converter causes the engine failure lamp to turn on. The use of leaded gasoline, the use of lead or silicon lubricant additives, the collision of the three-way catalyst, and the failure of the engine oil supply system are some of the factors that easily cause the failure of the three-way catalyst.
8. Anti-theft system
If the car's electronic anti-theft system fails, or the anti-theft controller does not match the engine electronic controller, the anti-theft system will also cause the engine to not work normally, and the engine failure light will turn on.