* Fuel/Air Mixture Imbalance: Fuel injectors are responsible for precisely delivering fuel to the engine's cylinders. If an injector fails, it can cause an imbalance in the fuel/air mixture entering the combustion chamber. This imbalance can be too much fuel (rich condition) or too little fuel (lean condition).
* OBD System Detection: Modern vehicles are equipped with an On-Board Diagnostic (OBD) system that constantly monitors various engine parameters, including fuel mixture. When the OBD system detects a significant deviation from the ideal fuel/air ratio due to a faulty injector, it will illuminate the check engine light.
* Diagnostic Trouble Codes (DTCs): The OBD system will store specific diagnostic trouble codes (DTCs) related to the malfunctioning injector. These codes can help a mechanic pinpoint the problem during diagnosis.
Other Signs of a Failing Fuel Injector:
* Rough Idle: The engine may run rough, especially at idle, due to an inconsistent fuel supply.
* Reduced Power: The engine may feel sluggish or lack power during acceleration.
* Increased Fuel Consumption: A faulty injector can lead to increased fuel consumption because the engine isn't burning fuel efficiently.
* Misfires: The engine may experience misfires (a cylinder not firing properly) due to insufficient or inconsistent fuel delivery.
* Black Smoke: Excessive fuel being injected can cause black smoke from the exhaust.
Important Note: While a failing fuel injector is a common reason for the check engine light, it's crucial to get the car properly diagnosed by a mechanic. The light could also be caused by other issues, such as a faulty oxygen sensor or a problem with the ignition system.
