What does the MIL warning light in a diesel vehicle mean?

[VonChloe]

MIL stands for Malfunction Indicator Lamp, indicating that there is a fault in the engine system. The MIL light may illuminate due to excessive carbon buildup in the throttle body or engine internals, a faulty oxygen sensor causing an improper air-fuel mixture ratio, or poor fuel quality leading to incomplete combustion. Below are some common engine-related issues: 1. Starter failure: This includes insufficient battery charge, blown circuit fuses, or broken starter wiring, resulting in engine start failure. 2. Unstable idle speed: The engine exhibits unstable RPM with significant fluctuations during operation, often caused by air leaks in the intake system. 3. Slow RPM response during sudden acceleration: When rapidly accelerating, the engine shows sluggish RPM increase, potentially due to low ignition voltage or delayed ignition timing.