What does the dashboard light indicate after the engine starts?

[DiAbigail]

After the engine starts, the dashboard light may indicate that the car system is performing a self-check. Generally, the indicator light turns on for about 3-4 seconds after the ignition is switched on and then turns off, indicating that the car's electronic control system is functioning normally. If the self-check indicator light of the car's electrical system does not turn on or remains lit, it indicates a fault in the car's electrical system. For example, if the engine self-check indicator light remains lit, it indicates an engine fault, and immediate inspection and repair are required. Additional information: Oil pressure indicator: This light displays the oil pressure status inside the engine. During the vehicle self-check, the indicator light turns on and turns off after the engine starts. If the indicator light remains lit, it means the engine oil pressure is below the specified standard, and repairs are needed. Coolant temperature indicator: This light primarily shows the temperature of the coolant inside the engine. It lights up for a few seconds during the vehicle self-check and remains off under normal conditions. If the coolant temperature exceeds the specified value, the vehicle should be stopped immediately for inspection and repair.

[OAddyson]

Last time I encountered this situation, I was quite panicked too. After the engine started, that small yellow engine light suddenly came on and wouldn't go off. My car-savvy friend told me this means the onboard computer detected an anomaly—it could be an air leak in the intake system or an oxygen sensor error. In my case, it turned out to be a loose fuel tank cap, a minor issue that made the system misjudge the exhaust emissions. My advice? Don't ignore it. First, check the fuel tank cap and brake lights. If the light remains on, it's best to get the trouble codes read within two days. Nowadays, repair shops have diagnostic equipment that can pinpoint the issue in just five minutes. Definitely don't wait until the engine develops real problems to address it—that could double the repair costs.

[LaLilliana]

I've repaired many cars with this symptom. A constantly illuminated engine light on the dashboard indicates trouble codes in the powertrain system. It might not break down immediately, but could affect fuel consumption and emissions. Common issues include aging spark plugs and clogged air filters. Once a customer ignored the light for a week, resulting in complete failure of the oxygen sensor - replacing it cost over 2,000 yuan. I recommend first observing driving sensations, such as sluggish acceleration or abnormal vibrations, then promptly using an OBD scanner to read the codes. Developing the habit of checking dashboard indicators during cold starts can help detect many potential issues early.

[SanFelicity]

Don't rush to turn off the engine when the check engine light comes on. First, listen carefully for any abnormal engine sounds. This warning light typically indicates excessive emissions or incomplete combustion, often caused by carbon buildup. Once, my light suddenly illuminated at a highway rest stop - I immediately pulled over to check coolant and engine oil levels. Fortunately, it was just poor-quality fuel. Nowadays, gas station quality varies greatly, and substandard gasoline can trigger the warning. Remember: continuing to drive with the light on may damage the catalytic converter. Replacing that component costs at least 8,000 RMB - far more expensive than regular engine maintenance.