Citroen C4 Sega 09 hatchback Sega's fuel consumption is too high?

1, cleaning up the engine carbon deposit Too much carbon deposit in the engine is a very important reason, mainly due to the use of inappropriate oil products. It is suggested to add a certain amount of cleaning liquid when refueling, and it is best to drive at high speed after cleaning, which is beneficial to increase the exhaust volume and let the stronger airflow bring out larger carbon particles. 2. Check the oxygen sensor as the internal control unit of the automobile. The oxygen sensor mainly monitors the oil-gas ratio of the engine. Once damaged, it will cause the imbalance of engine oil-gas ratio, and the fuel consumption will definitely increase suddenly. The oxygen sensor is damaged, and the exhaust pipe will emit dark exhaust gas when the vehicle is driving, so the oxygen sensor should be replaced. 3. Replace the three filter cars regularly. During use, the oil filter, air filter and gasoline filter must be replaced regularly. If it is not replaced for a long time, it will become dirty and greasy, which will affect the use and send an error message to the engine control unit, resulting in insufficient fuel combustion and increased carbon deposition in the engine.