What Causes the Engine Fault Light to Illuminate and Increased Fuel Consumption?
2 Answers
Engine fault light illumination and increased fuel consumption are indicators of engine and exhaust system malfunctions. They can generally be categorized into the following three types: 1. False Fault: A fault code is reported, but the engine operates normally. This may occur when an operation exceeds the control range of the computer, prompting the computer to feedback a fault code. The code can be cleared initially, and then observe whether it reappears. 2. Minor Fault: The engine does not exhibit obvious malfunctions, but further inspection based on computer detection information reveals an actual issue that does not significantly affect normal driving or has minimal impact. Timely identification and resolution are required. Examples include faults with the intake pressure sensor. 3. Major Fault: Such faults can be detected visually or through driving experience and severely impair the engine's normal operation, necessitating immediate repair. For instance, noticeable engine power loss may indicate an oxygen sensor problem, among others.
I once encountered the engine warning light coming on with increased fuel consumption. At that time, my car noticeably lacked power on the road, and the fuel consumption numbers kept climbing rapidly. There are usually several major reasons for this issue: The most common one is a faulty oxygen sensor, which is responsible for controlling the fuel-air mixture ratio. Once it fails, the engine will inject more fuel to compensate, resulting in skyrocketing fuel consumption. Another possibility is problems with the ignition system, such as aging spark plugs or faulty ignition coils, leading to unburned fuel waste. It could also be clogged fuel injectors or unstable fuel pump pressure, causing an overly rich mixture and incomplete combustion. Additionally, a blocked catalytic converter can trigger the warning light, and restricted exhaust flow forces the engine to work harder, consuming more fuel. My advice is to use a diagnostic tool to read the trouble codes as soon as possible. Don't delay to save small money only to spend big later—fuel costs can drain your wallet by half! It's best to get it checked and repaired at a professional shop promptly.
