What does it mean when the malfunction indicator light comes on?
2 Answers
The reasons for the malfunction indicator light coming on are: 1. Sensor issues: Sensors include coolant temperature, crankshaft position, air flow, intake air temperature, and oxygen sensors; 2. Air intake problems: The engine requires air intake during combustion, and the air filter plays a crucial role in this process. If the car's air filter is dirty or not cleaned regularly, it can affect the engine's air intake; 3. Poor fuel mixture combustion: Faulty spark plugs, ignition coils, fuel pump, or clogged fuel lines can all lead to poor combustion of the engine's fuel mixture. Poor combustion can result in engine carbon buildup or knocking issues, which are detected by the engine's oxygen sensors and reported to the ECU, triggering the malfunction light as a warning.
I've been driving for over twenty years, and there are quite a few reasons why the malfunction indicator light comes on. Common issues include sensor failures, such as oxygen sensors or emission system faults, which can lead to excessive exhaust emissions. It could also be something as simple as a loose fuel cap, causing the computer to mistakenly detect a leak. Last time my light came on, I found it was just a loose fuel cap—tightening it a few times fixed the issue. But don’t take it lightly; sometimes it could be a failing engine or spark plugs, leading to skyrocketing fuel consumption or even stalling mid-drive. I recommend first using an OBD scanner to read the error codes—you can find affordable ones at auto parts stores—to pinpoint the exact issue. If you're really unsure, take it to a repair shop instead of pushing your luck, as driving with a serious issue could damage your car and pose a safety risk.
