What are the reasons for a sudden increase in car fuel consumption?

[Arianna]

Reasons for a sudden increase in car fuel consumption: 1. Oxygen sensor malfunction: If the increase in fuel consumption is not caused by poor driving habits, it is advisable to check whether the car's oxygen sensor is damaged or malfunctioning. In case of a fault, the oxygen sensor fails to function properly, leading to incorrect feedback on the car's exhaust emissions. For example, incomplete fuel combustion or insufficient power output may cause the car's computer to collect erroneous data, resulting in an increase in fuel injection and progressively higher fuel consumption over time. If the oxygen sensor is faulty, it can be cleaned or replaced with a new one. 2. Spark plug malfunction: Under normal circumstances, the fuel consumption of a regular SUV is around 10 liters per 100 kilometers. If it suddenly increases, check whether the spark plugs are malfunctioning. Carbon deposits on the spark plugs can cause weak ignition or delayed ignition, leading to increased fuel injection and higher fuel consumption. 3. Charcoal canister malfunction: Another possibility is that the car's charcoal canister solenoid valve is malfunctioning. It is recommended to take the car to a 4S shop for inspection and replace the charcoal canister. Doing so should resolve the issue of high fuel consumption.