What is the reason for the engine malfunction indicator light to come on?
2 Answers
The reason for the engine malfunction indicator light to come on is: The engine malfunction light is part of the emission system. When the engine control unit detects a fault in a sensor, leading to emissions not meeting standards, it will illuminate the malfunction light. Any fault in the vehicle's electronic components can trigger the engine malfunction light. If the malfunction light comes on, it indicates an issue with a certain part of the vehicle. However, if the vehicle can still move, it suggests the problem is not particularly severe, as a red light would indicate a more serious fault, whereas the engine malfunction light is yellow. Once the light comes on, the owner should avoid long-distance driving and should drive to the nearest service station for inspection and repair as soon as possible, to prevent a minor temporary issue from developing into a major problem.
Last time my car's warning light came on, it gave me a scare. Fortunately, I know a bit about cars. It's most likely an issue with the oxygen sensor, such as too much carbon buildup causing incorrect signals, making the computer think there's a problem with the engine. Additionally, ignition system problems like old spark plugs failing to ignite can also trigger the light. It could also be a fuel system issue, such as clogged fuel injectors causing uneven fuel spray, or a failing catalytic converter in the exhaust system leading to poor exhaust flow. If the car is low on oil or has unstable oil pressure, the light might come on too. I recommend getting it checked promptly; otherwise, continuing to drive could cause serious engine damage, leading to higher repair costs. You can first check the oil level with the dipstick to make sure it's not too low, but for other issues, it's best to visit a professional shop to scan the trouble codes—safety first.
