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

1 Answers
DeCody
07/30/25 9:36am
Diesel vehicles may experience a sudden increase in fuel consumption due to the following reasons: 1. Maintenance issues: Excessive or insufficient engine oil, poor quality, high viscosity, or failure to change it on time are all critical factors affecting engine operation; a dirty air filter can block the intake, increasing intake resistance, reducing power, and increasing fuel consumption. 2. Oxygen sensor failure: The oxygen sensor, located in the vehicle's exhaust pipe, is a ceramic component that detects and controls the oxygen-to-fuel ratio. It monitors exhaust gases to regulate the fuel injection system. If the oxygen sensor fails, it can affect the fuel supply, leading to a significant direct increase in fuel consumption.
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