When the Check Engine indicator lights up on the dashboard, it signals to the driver that there’s been a malfunction or failure in one of the engine systems. During the era of carbureted engines, it had a limited scope of responsibility, but as onboard electronics and diagnostic equipment evolved, it became a general indicator pointing to various malfunctions.
When Check Engine Lights Up
The warning symbol appears on the dashboard when the engine’s electronic control unit detects a problem and records it in memory as a code, simultaneously commanding the activation of a warning light that’s impossible to ignore. In some situations, the Check Engine stays on constantly, while in others it flashes and goes out after some time – it all depends on the malfunction. On some vehicles, the self-diagnostic system allows immediate identification of the problem causing this indicator to light up, but usually, a diagnostic scanner connected through a port or a laptop with special software helps determine the issue.
If you suddenly see the Check Engine on your dashboard and notice changes in engine operation, take it seriously – negligent attention to this fault indicator can lead to more serious breakdowns.
Why Check Engine Lights Up
There are many reasons why the engine malfunction light might illuminate, but let’s start with a fairly common one – poor quality fuel that can cause a dangerous phenomenon known as detonation. In such cases, people say the car is “complaining” about the fuel. Power may decrease, and the engine might run irregularly. Further actions depend on the scale of the problem. Some recommend adding better gasoline or diesel to the tank, essentially diluting the poor fuel. But in some situations, it’s necessary to drain the poor-quality fuel that your car was filled with at the gas station and refill it with quality fuel.
Low oil level? Believe it or not, this can also trigger the warning indication. In this case, it’s extremely important to understand why there’s less lubricant in the engine. Is oil burning or leaking through the seals the cause?
Fuel pump problems are another reason for the dashboard pictogram to appear, although usually its malfunctions are so pronounced that most drivers will surely notice changes in vehicle behavior even without the warning light. Additionally, faulty fuel injectors can trigger the Check Engine light.
Symptoms include increased fuel consumption, reduced power, and fluctuating idle engine speed. There might be jerking when accelerating. It’s also worth checking high-voltage system elements. Worn wires, ignition coils, and spark plugs – all these can cause the indicator to light up.
When You Can Drive and When You Can’t
The appearance of the Check Engine indicator may be accompanied by several symptoms, but there are situations when the car’s behavior doesn’t change fundamentally, or the reasons for concern are quite minor. Specialists advise against driving in the following cases. First, if the vehicle shows reduced power and limited RPMs (entering emergency mode) with a constantly lit or flashing light. Second, continuing to drive is highly undesirable with unstable engine operation, vibration, and other symptoms. In this case, it doesn’t matter whether the Check Engine light is constant or flashing. And, of course, you should avoid driving when indicators for oil, catalytic converter, and engine overheating notifications illuminate simultaneously.
How to Reset Errors Yourself
The light may come on after an electronic control unit malfunction, and sometimes it doesn’t go out after fixing the problem. Usually, the annoying indication is disabled at service centers, but there’s a widely known simple way to reset errors – disconnecting the negative battery terminal for about 15-20 seconds.
If it’s about minor problems caused by poor-quality fuel, the warning indication will go out after reconnecting the battery. But if nothing changed, or the orange indicator lit up after some time, that’s a sure sign to visit a service center and diagnose the car.
How to Diagnose Yourself
With diagnostic skills and a laptop with special software, you can read the car’s data yourself. However, not everyone can do this, and cars from different years may have different error code lists. Therefore, a simpler, albeit limited diagnostic option is checking with a smartphone with a special application and a Bluetooth adapter. Generally, though, trust the diagnostics to service professionals with special equipment and knowledge – this is often much more reliable.
