Our articles on troubleshooting check engine light issues can provide valuable insights into the problem. However, if you have already checked for leaks and the light is still on, you may want to consider other causes, such as issues with the sensors or other components of the engine. One possible cause is a coolant leak, which can cause the engine to overheat and trigger the check engine light to come on. If you’re experiencing a check engine light after filling coolant, there could be several reasons behind it. Or you can visit a more component auto mechanic shop. If your car was diagnosed and repaired by a repair shop, you should go back to the shop for further help. If you ignore this light and continue driving your car, then your engine may get an internal temperature that’s too high that it causes permanent damage, leading to expensive repairs. Consider stopping as soon as possible or when it’s safe to do so.Īs we explained earlier, the CEL triggered by the coolant sensor simply warns that the engine temperature is running high, and tells you to take immediate action. We advise against operating your vehicle if the check engine light is on after filling coolant. Should you continue driving with check engine light on after filling coolant? For instance, you could easily blow up the head gasket. In case the car overheats, continuing to operate it risks doing more damage to it, which will cost you more money. We don’t recommend you ignore the light and keep driving the car. In most cases, the mechanic will point out a compromised sensor as the issue, which if replaced will make the light clear up.Īdditional issues that could be causing the light not to reset even if you have lots of coolant include pinched hoses, a plugged-up radiator, failed water pump, a hole in the radiator, a hole in the hose, or the radiator fan not functioning properly. If the light just doesn’t reset, then you should take your car to your auto repair shop to have it diagnosed to find out what’s causing the light to illuminate. This will give the sensor time to communicate to the computer and, hopefully, reset the CEL. You may want to give your car some time to see if the light will go away after you’ve topped off the coolant.ĭrive your vehicle for a few hours with the operating temperature of your vehicle at normal levels. You may try topping off the radiator with proper antifreeze to see if it helps. So, will filling the radiator with coolant solve the issue? This may only work to reset the light if no damage has been done to the sensor or thermostat. When coolant runs low and can’t offer effective protection to engine internal heat, the sensor becomes compromised, and a check engine light shows up. The sensor is usually immersed inside the coolant reservoir/overflow tank to effectively monitor the coolant level. The work of this sensor is to regulate the combustion engine’s internal temperature. The most common reason this happens is due to a default coolant level sensor.
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