Increased Fuel Consumption
An increase in fuel consumption is a common symptom that drivers face when their car suddenly starts using much more fuel than usual. Ignoring this sign is not worth it, as it not only hits your wallet but also signals hidden malfunctions that can lead to more serious engine repairs.
Likely causes — most common first
Dirty Air Filter
When the filter gets clogged with dust and dirt, the engine starts to suffocate and gets less air than it needs. As a result, the fuel-air mixture becomes too rich, which directly increases fuel consumption.
Worn Spark Plugs
Old or damaged spark plugs give a weak spark, which means the fuel in the cylinders does not burn completely. The electronics try to compensate for this by supplying more fuel, but the power drops, and consumption increases.
Oxygen Sensor Failure (Lambda Probe)
This sensor controls the amount of oxygen in the exhaust gases and helps the car's computer prepare the correct mixture. When the sensor fails, it transmits false data, and the engine constantly runs in a rich fuel mode.
Tire Pressure or Wheel Alignment Problems
Low tire pressure creates additional rolling resistance, forcing the engine to expend more effort to accelerate the car. Incorrect wheel alignment angles have a similar braking effect while driving.
Brake System Wear (Stuck Calipers)
If the brake pads do not fully retract from the disc, the wheel constantly brakes slightly. The engine has to overcome this resistance, which sharply increases fuel consumption.
