What to do when the Q3 engine warning light comes on?

[BrodyDella]

Audi Q3 engine warning light is on, you can follow these steps to deal with it: First, pay attention to whether the engine is running normally, whether there is shaking, black smoke, or difficulty in starting. If so, try not to start it again. Special note: Do not start the engine if the red light is on. If the engine is running normally and the car can be driven normally, please go to the service station as soon as possible to find out the cause. The service station only needs to connect a portable diagnostic device to easily read the fault code, obtain fault information, and carry out targeted repairs. If the engine is running normally, the owner can also try to gently plug in each wiring harness connector, as it may be caused by a loose connection somewhere, or repeatedly turn the key to the ON position to see if it can be eliminated. Generally speaking, the reasons for the engine warning light coming on mainly include the following 7: Sensor failure: The sensors mentioned here include water temperature, crankshaft position, air flow, intake temperature, oxygen sensor, etc. When these sensors are damaged, have poor contact, or the signal is interrupted, the car's ECU cannot accurately obtain engine data, which will cause the engine warning light to come on. Oil quality problem: If fuel and engine oil are not added according to the manufacturer's requirements, it may cause engine wear and lead to the warning light coming on. Poor combustion of the mixture: Poor combustion of the mixture will cause engine carbon deposits or knocking. After being monitored by the oxygen sensor and reported to the ECU, the warning light will come on as a warning. Spark plug failure, ignition coil failure, fuel pump failure, fuel line blockage, etc., will all cause poor combustion of the engine mixture. Turbocharging problem: The intake turbocharging pipeline and turbocharger can also cause the engine warning light to come on. The most common is turbocharger damage, and the vehicle will also show symptoms such as oil leakage, high oil consumption, power drop, metal noise, blue or black smoke from the exhaust pipe. Intake problem: If the car's intake has a problem, it may cause the engine pipeline to be blocked, and in severe cases, it will cause the engine warning light to come on. If the air filter is not clean and not cleaned regularly, it will cause intake problems. Exhaust problem: Exhaust failure will also cause the engine warning light to come on. The rear oxygen sensor, three-way catalytic converter, exhaust camshaft and bearing failure are all reasons for exhaust problems, among which the three-way catalyst is the most common. Using leaded gasoline, using lead or silicon-containing lubricant additives, the three-way catalyst being knocked, and engine fuel supply system failure can easily cause three-way catalytic converter failure. Anti-theft system failure: 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 properly, and the engine warning light will come on.