Why has the Passat's fuel consumption suddenly increased?
2 Answers
This situation is mainly caused by issues with the engine's internal sensors. It is necessary to check whether the engine's data flow is normal. Additionally, fuel consumption is closely related to the driver's habits, road conditions, and the vehicle's break-in period. After becoming familiar with the car and completing the break-in period, fuel consumption will gradually decrease. For a 1.6L engine, consumption within 8L is normal. After the first maintenance, fuel consumption will stabilize but not necessarily decrease, as it is also influenced by daily driving habits and road conditions. Below are the reasons for high fuel consumption in the Passat and solutions: 1. Clean carbon deposits: Removing carbon deposits from the engine is crucial, as they are a significant cause, primarily due to the use of inappropriate engine oil. 2. Check the oxygen sensor: The oxygen sensor, as an internal control unit of the car, monitors the engine's air-fuel ratio. Once damaged, it can cause an imbalance in the engine's air-fuel ratio, leading to a sudden increase in fuel consumption. 3. Regularly replace filters: It is essential to periodically replace the three filters—the oil filter, air filter, and fuel filter. If not replaced for a long time, they can become dirty, affect performance, and send incorrect information to the engine control unit, resulting in incomplete fuel combustion and increased engine carbon deposits.
I've noticed that my Passat's fuel consumption has suddenly increased, which is really frustrating. It might be because of my recent work stress, leading me to frequently accelerate and brake sharply, causing incomplete fuel combustion. Low tire pressure increases rolling resistance, but it's easy to check—just buy a tire pressure gauge. A dirty air filter can also block airflow, reducing engine efficiency and naturally increasing fuel consumption. Another possibility is aging spark plugs causing poor ignition, leading to incomplete combustion of the air-fuel mixture. Last time I visited my friend's repair shop, he advised me to perform regular maintenance, checking the filters and spark plugs every 10,000 kilometers—this habit can prevent major issues. Weather factors should also be considered; using the AC more in summer or longer warm-up times in winter both consume more fuel. Adjusting driving habits to be less aggressive saves fuel and enhances safety. In short, timely troubleshooting is key—don't delay.
